mechanical engineering department (bureau of …1431-1435)_09042015.pdf · mechanical engineering...

MECHANICAL ENGINEERING DEPARTMENT

(BUREAU OF INDIAN STANDARDS

Pumps Sectional Committee, ME 20

TO:

a) The interested members of Mechanical Engineering Division Council, MEDC;

b) All members of Pumps Sectional Committee, ME 20, Agriculture and Domestic Pump

Sub Committee, ME 20:5 &

c) All others interested

Dear Sir(s),

Please find enclosed the following document:

Sl.

No.

Doc. No. TITLE Prepared by

1 Doc: MED

20(1431)P

P - Draft Standard on Pumps — Centrifugal Self

Priming Specification (Second Revision of IS 8418)

Shri Nirmal C Tiwari, M/s KBL, Pune

2 Doc: MED

20(1432)P

P - Draft Standard on Submersible Pumpsets –

Specification (Third Revision of IS 8034)

Dr R Subramanian, M/s SIEMA ,

Coimbatore

3 Doc: MED

20(1433)P

P- Draft Standard Centrifugal Jet Pump –

Specification ( Second Revision of IS

12225)


4 Doc: MED

20(1434)P

P- Draft Standard on Part 3 Recommended

Pumping System For Domestic Pumps (Third

Revision of IS 10804)


5 Doc: MED

20(1435)P

P-Draft Standard on Specification — For Pumps

for Fire Fighting System (Third Revision of IS

12469)

Shri R S Birajdar, M/s KBL, Pune

Kindly examine the P-Draft Standards and forward your views stating any difficulties which you are likely

to experience in your business or profession, if this is finally adopted.

Last date for receipt of comments: May 6th

, 2015.

Comments, if any, may please be made in the format as given overleaf and e-mailed to

the undersigned at the above address.

In case of comments of technical in nature are received then it may be finalized in consultation

with the Agriculture And Domestic Pump Sub Committee, ME 20:5 or referred to the Sectional

Committee for further necessary action if so desired by the Chairman, Sectional Committee.

DOCUMENT DESPATCH ADVISE

Ref: ME 20/T-10, 11,26, 33 & 34 Date: April 6,

2015

DRAFT STANDARDS IN PROPOSED

The documents are also hosted on BIS website www.bis.org.in.

Thanking you,

Yours faithfully

(A K Mohindroo)

Scientist ‘B (MED)

Phone/Fax: 011-

23232509 E-mail:

[email protected]

Encl: As above

http://www.bis.org.in/

IS 8418:1999

Doc. No. MED 20 (1431)P

1

For BIS USE ONLY

PROPOSED DRAFT REVISION

PUMPS — CENTRIFUGAL SELF PRIMING ─ SPECIFICATION

(Second Revision of IS 8418)

Draft Standard Prepared by Last date for comments is

Shri Nirmal C Tiwari, M/s KBL, Pune May 6th

, 2015.

1 SCOPE

1.1 This standard specifies the technical requirements for horizontal/vertical, single/multi

stage centrifugal self-priming pumps for handling clear cold water.

1.2 Types

The various types of self-priming centrifugal pumps are as follows:

a) Re-circulation in suction (see Fig. 1);

b) Re-circulation in delivery (see Fig. 2);

c) Auxiliary self-priming pump with main pump (see Fig. 3); and

d) Self-priming pump with built-in ejector (see Fig. 4).

1.3 Details of types of self-priming pumps and their working principle are given in Annex A

and Fig. 1 to Fig. 4.

2 REFERENCES

2.1 The Indian Standards listed below are necessary adjuncts to this standard:

IS No. Title

210 Grey iron castings (fourth revision)

318 Leaded tin bronze ingots and castings (second revision)

694

Polyvinyl Chloride Insulated Unsheathed-- And

Sheathed Cables/cords With Rigid And--Flexible

Conductor For Rated Voltages--Up To And Including

450/750 V Code of practice for construction and

testing of tubewells/borewells

1570 (Part 2/Sec 1)

Schedule for wrought steels: Part 2 Carbon steels

(unalloyed steel), Section 1 Wrought products (other

than wire) with specified chemical composition and

related properties (first revision)

IS 8418:1999

Doc. No. MED 20 (1431)P

5120 Technical requirements for Rotodynamic special

purpose pumps (first revision)

6603 Stainless steel bars and flats

9137 Code for acceptance tests for centrifugal mixed flow and

axial pumps — Class 'C'

10572 Methods of sampling pumps

11346 Testing set up for agricultural pumps

11723 Mechanical vibration — Balance

3 UNITS, TERMINOLOGY AND CLASSIFICATION

3.1 For the purpose of this standard, units, terminology and classification given in IS 5120

shall apply, in addition to the following :

3.1.1 Static suction lift

It is the vertical distance between the pump center line and the water level.

3.1.2 Manometric suction lift

Manometric suction lift is the vacuum gauge / suction manometer readings in meters of

water column.

4 CHARACTERSTICS OF CLEAR, COLD WATER

Clear cold water shall mean water having the characteristics specified below:

a) Turbidity 50 ppm silica scale, max

b) Chlorides 500 ppm, max

c) Total solids 3000 ppm, max

d) pH 6.5 to 8.5

e) Temperature 33°C max

f) Specific gravity 1.004, max

g) Hardness (Drinking Water) 300, max

NOTES— If any other characteristics of water differ from those specified in 4, the pump details will have to be agreed between the

manufacturer / supplier and the user and shall be specified in the order.

5 NOMENCLATURE

Nomenclature of the parts commonly used for the different types of horizontal / vertical,

single / multi stage centrifugal self priming pumps shall be as given in Fig. 2.

6 CONSTRUCTIONAL FEATURES

6.1 Materials of Construction

It is recognized that a number of materials of construction is available to meet the needs for

the horizontal / vertical, single / multi stage centrifugal self priming pumps handling clear cold

IS 8418:1999

Doc. No. MED 20 (1431)P

3

water. Typical material for few parts are indicated in Table 1 for the guidance of the

manufacturers and users.

Table 1 Typical Materials of Main Parts of Pumpset

(Clause 6.1 )

Sl.

No. Name of the Part Material of Construction

1 Casing Cast iron, Grade FG200 of IS 210

2 Impeller

Cast iron grade FG 200 of IS 210 or Bronze

grade LTB 2 of IS 318 or stainless steel

grade 04Cr13 or 12Cr13 or 20Cr13 of

IS 6603

3

Casing and

impeller wearing

ring / wear plate

(if provided)

Cast iron grade FG 200 of IS 210 or Bronze

grade LTB 2 of IS 318

4 Shaft Grade 40 C8 of IS 1570 (Part 2/Scc 1)

5 Shaft sleeve,

where used

Bronze Grade LTB 2 of IS 318 or stainless

steel grades 04Cr13 or 12Cr13 or 20Cr13

of IS 6603

NOTES—

1) The materials listed are to be considered as only typical and indicative of minimum requirements of the material properties.

The use of materials having better properties is not prejudiced by the details above provided materials for components in

bearing contact with each other do not entail galling, corrosion, magnetic induction, etc.

2) To benefit from the advancement in technology of engineering plastics, thermoplastics materials such as polyphenylene oxide

(PPO) poly carbonate, acctal, nylon 6 or 66. PTFE. ABS. polyester PETP, Glass filled nylon. UHMWPE (Ultra High Molecular

Weight Polyethylene ) etc may be used for pump parts like bearing sleeve, casing, impeller wearing ring etc. However, typical

materials of the main parts are indicated below for the guidance of the manufacturer and the user.

Sl.

No. Name of the Part Material

1 Impeller Glass filled polyphenylene Oxide (Modified PPO ), Glass filled

polycarbonate * properties shall be as given below

Properties

Modified

Polyphenylene

Oxide

Polycarbonate

Hardness (Rockwell) M90/L106 M91

Taber abrasion resistance, g 0 035 0 017

Coefficient of linear, m/m°C

thermal expansion 4 × 105, Max 5 ×105, Max

IS 8418:1999

Doc. No. MED 20 (1431)P

Water absorption, 24 h at 23°C,

percent 0 06, Max 0 29. Max

Notched impact strength Izod, J/m 80, Min 100, Min

Specific gravity

121± 0.03 1..35 ± 0.03

Tensile strength at break, N/mm2 90, Min 90. Min

Elongation at break, percent 4-6 3

Mould shrinkage, percent 0 2-0.4 0 2-0.5

Glass content, percent 20, Min 2°, Min

2 Wearing ring PTEE, ABS or Nylon 66

3 Bearing sleeve Polyethylene (LH/HT), Nylon 66, PTEE, polypropylene

6.2 Gaskets, Seals and Packings

Gaskets seals and packing used for clear cold water pumps shall conform to those specified

in IS 5120.

7 DIRECTION OF ROTATION

The direction of rotation of pump set is designated clockwise or anti- clockwise as observed

when looking at the pump shaft from the driving end.

The direction of rotation shall be clearly marked either by incorporating an arrow in the

casting or by a separate metal plate arrow securely fitted to the delivery casing of the pump

8 SUCTION LIMITATIONS

Suction limitations affecting the performance of pumps for clear cold water shall be as

those specified in IS 5120.

9 INFORMATION TO BE FURNISHED BY THE PURCHASER

When inquiring or ordering pumps to this standard, the user shall furnish the following

information to the supplier:

a) Total capacity required in lps,

b) Total head in metres.

c) Operational speed rpm

d) Primemover rating kW

10 FACTORS AFFECTING PUMP PERFORMANCE

Factors affecting pump performance shall be as those specified in IS 5120.

11 DESIGN FEATURES

The pump shall have suitable designed to ensure satisfactory performance.

IS 8418:1999

Doc. No. MED 20 (1431)P

5

a) The pump shall be provided with two bearings.

b) The pump shall be capable to operate without overloading the prime-mover in

the specified head range. The specified head range shall be as follows :

For guaranteed duty point head upto 20 m : minimum +10 percent and minimum - 20

percent of the guaranteed duty point.

− For guaranteed duty point head Above 20 m : minimum +5 percent and

minimum -20 percent of the guaranteed duty point.

c) The pump shall be capable of working under static suction lift of 3 m at specified

duty point or a manometric suction lift of 4.5 m.

d) The impellers may be of the enclosed or the semi-open type or open type.

e) The inlet passages of the suction casing shall be streamlined to avoid eddies.

f) The manufacturer shall have a system of controlling dimensional accuracy

within a scheme of fits and tolerance limits. The system shall help

interchangeability at site of replacement of spares during repair and

maintenance.

12 GENERAL REQUIREMENTS

12.1 The general requirements for the pump shall be as given in IS 5120.

12.2 Pump Casing

The pump casing shall be of robust construction and shall be tested to withstand 1.5 times

the maximum discharge pressure for 2 minutes.

12.3 Impeller

The impeller shall be dynamically balanced to grade G 6.3 of IS 11723(Part 1). However, in

case the pump speed is less than 1 500 rpm and impeller diameter less than 250 mm, the

impeller may be statically balanced.

NOTE — Balancing here means the balancing of the unbalanced rotating mass in the impeller and not balancing of the axial hydraulic

thrust in the impeller. Impellers made of Engineering Plastic need not be balanced.

12.4 Shaft

The shaft shall be of adequate size to transmit the required power.

12.5 Efficiency

The pump/overall efficiency of the pumps at duty point shall be declared by the

manufacturer.

12.6

Cables used shall be as per IS 694.

13 PUMP TEST

13.1 Sampling

IS 8418:1999

Doc. No. MED 20 (1431)P

The sampling and criteria of conformity shall be as specified in IS 10572.

13.2 Performance Test

The testing of the pump performance shall be in accordance with IS 11346.

13.3 Priming Test

13.3.1 Priming time

The self priming pumps shall be tested to determine the priming time. The pump shall be

tested at a static suction lift of 3 m. No check or foot valve shall be installed in the suction

piping. The test set up shall be as shown in Fig. 5.

The priming chamber of the pump shall be filled with water before starting of the pump.

The priming time shall be the total elapsed time between starting the pump and the time

required to obtain a steady delivery gauge reading or full flow through the discharge pipe.

13.3.2 Primary Time Conversion Factor

If a pump is connected to a larger pipe than the nominal pipe size of the pump on the

suction side, it is necessary to compute the performance for the nominal pipe size of the

pump. For ease of reference, the conversion factors are given in Table 2.

The method of finding the conversion factor is as explained below:

a) Select the size of the suction pipe actually used in the test.

b) Follow this line horizontally right to the vertical column under the heading size of

nominal pipe.

c) The figure shown at the intersection is the conversion factor.

d) Divide the test time (in seconds) by this factor and then divide the resultant by

the total vertical length of suction pipe above water level in meters. This gives

the average time in seconds for air removed from a suction line of nominal size

per meter of length.

14 GUARANTEE

14.1 Guarantee of Workmanship and Material

The pumps shall be guaranteed by the manufacturer against defects in material and

workmanship, under normal use and service, for a period of at least 15 months from date

of dispatch or 12 months from the date of commissioning whichever is less.

14.2 Guarantee of Performance

14.2.1 The pumps shall be guaranteed for their performance of:

a) The volume rate of flow and the head at the guaranteed duty point.

b) The efficiency of the pumps shall be guaranteed at the declared duty point only.

IS 8418:1999

Doc. No. MED 20 (1431)P

7

c) Maximum self-priming time at minimum 3 m static suction lift.

14.2.2 The guarantee shall be deemed to have been met with, if:

a) The measured values of head and volume rate of flow are within the limits

indicated in IS 11346.

b) Power consumption by the pump does not exceed the recommended prime-

mover rating in the specified head range.

c) The requirements of self-priming time and self-priming static suction lift are

complied.

15 PERMISSIBLE INACCURACIES IN MEASUREMENTS

In all commercial acceptance tests for pumps a certain tolerance shall be allowed to the

manufacturer on his guarantee to cover the inaccuracies of the equations for volume rate

of flow, errors of observation and unavoidable errors of the instruments employed. The

permissible inaccuracy in the measurement of various quantities shall be as indicated in

IS 11346.

16 PARAMETERS TO BE DECLARED BY MANUFACTURER

16.1 The following parameters shall be declared by the manufacturer:

a) Pipe size (suction and delivery),

b) Speed,

c) Duty point head and discharge rate,

d) Pump efficiency at duty point,

e) Head range for overloading requirement,

f) Recommended primemover rating,

g) Maximum permissible static suction lift, and

h) Maximum self priming time at 3 m static suction lift.

16.2 An operating and maintenance manual shall be supplied along with each pump. Such

manual shall contain the following details in addition to the information mentioned in 16

and 17.

a) Plan and cross-sectional view of the pump showing various components,

b) Spare parts list,

c) Routine maintenance and lubrication guidelines,

d) Trouble shooting tips, and

e) Warranty card

IS 8418:1999

Doc. No. MED 20 (1431)P

Suction

Pipe Size

Used for

Testing ,

10 15 20 25 32 40 50 65 80 90 100 125 150

15 1 68 - - - - - - - - - - - -

20 3 23 1 92 - - - - - - - - - - -

25 5 1 3 0 1 57 - - - - - - - - - -

32 9 05 5 36 2 8 1 78 - - - - - - - - -

40 12 4 7 4 3 85 2 45 1 37 - - - - - - - -

50 20 2 12 0 6 25 4 0 2 23 1 62 - - - - - - -

65 34 6 20 6 10 7 6 8 3 82 2 78 1 72 - - - - - -

80 48 2 28 5 14 9 9 5 5 32 3 88 2 38 1 34 - - - - -

90 - 38 4 20 0 12 8 7 15 5 2 3 2 1 87 1 34 - - - -

100 - 49 0 35 5 1 62 9 1 6 62 4 06 2 37 1 71 1 27 - - -

125 - 95 5 39 4 25 1 14 1 10 3 6 3 3 68 2 65 1 97 1 55 - -

150 - - 56 5 36 0 20 2 14 7 9 05 5 3 4 0 2 82 2 22 1 44 -

200 - - 94 5 60 8 34 0 24 7 15 3 8 9 6 4 4 75 3 74 2 44 1 68

250 - - - 95 2 53 6 39 0 22 9 14 0 10 05 7 46 5 90 3 8 2 65

100 - - - - 75 8 55 0 33 8 19 8 14 2 10 35 8 32 5 4 3 8

Table 2 : Priming Time Conversion Factor

(Clause 12.3.3)

Nominal Suction Pipe Size, mm

17 MARKING

17.1 The self priming centrifugal pump shall be marked with the following:

a) Manufacturer's name and / or recognized trademark;

b) Type, size and serial No. of pump;

c) Pipe size (suction and delivery) mm,

d) Speed rpm,

e) Duty point head (m) and discharge rate LPS,

f) Pump efficiency at duty point %,

g) Head range m,

h) Recommended primemover rating kW,

i) Arrow indicating direction of rotation.

17.2 BIS Certification Marking

The pumps may also be marked with the Standard Mark.

17.3 The use of the Standard Mark is governed by the provisions of the Bureau of India

Standards Act 1986 and the Rules and Regulations made thereunder. The details of under

which a license for the use of the Standard Mark may be granted to Conditions

manufacturers or producers, may be obtained from the Bureau of Indian Standards.

IS 8418:1999

Doc. No. MED 20 (1431)P

ANNEX - A

(Clause 1.3)

TYPES OF SELF-PRIMING CENTRIFUGAL PUMPS AND THEIR WORKING PRINCIPLE

A -1 TYPES

a) Re-circulation in suction,

b) Re-circulation in delivery,

c) Auxiliary self-priming pump with main pump, and

d) Self-priming pump with built-in ejectors.

A-1.1 Re-circulation in Suction

Self-priming pump of this type contains water reservoir either attached to or built in the

casing. Before starting the pump for the first time, reservoir should be filled with water. Re-

circulating port provided in the reservoir communicates with the suction side of the impeller.

When the pump is started, the impeller sucks the water from the re-circulating port and

certain amount of air from suction side. This mixture of water and air reaches the reservoir.

Here the air gets separated and escapes through discharge pipe. The water enters the suction

of the impeller through the re-circulating port. This operation continues until all the air has

been removed from the suction line. The vacuum thus created sucks the water from the water

source and supplies it to the impeller. The reservoir should remain filled with water when the

pump is stopped. This is accomplished by incorporating either a non-return valve or some form

of Map between the suction line and the impeller. This type of pump is shown in Fig. 1.

A-1.2 Re-circulation in Delivery

It may be distinguished from the preceding pump by the fact that the priming liquid is not

returned to the suction of the pump but mixes with the air either within the impeller itself or

at its periphery. Its principal advantage therefore is that it eliminates the complexity of internal

valve mechanisms. This type of pump is shown in Fig. 2.

A-1.3 Using an Auxiliary Self-priming Pump with the Main Pump

In this type, an air pump is attached on the suction side of the pump, whose impeller is driven

by the extension of the pump shaft. The air pump runs in parallel with the water pump,

removes the air from the suction line and discharges it into open air (or into the discharge

pipe, if it is an open line). After priming, the air pump discharges the water, generally back into

the suction line. The two kinds of air pumps used commonly are side channel type and water

ring type. These are shown in Fig. 3.

A-1.4 Self-priming Pump with Built-in Ejectors

Ejectors devices have been used for a considerable time to create a vacuum. They have also

found application in self-priming centrifugal pumps. Ejector pumps or jet pumps are

distinguished by their high suction lift capability (up to 9 m). They are less sensitive to

impurities in the water than side channel pumps or peripheral pumps. This type of pumps is

shown in Fig. 4.

IS 8418:1999

Doc. No. MED 20 (1431)P

FIG . 1 : SELF PRIMING PUMP RE-CIRCULATION IN SUCTION

FIG. 2 : SELF PRIMING PUMP RE-CIRCULATION IN DELIVERY

IS 8418 : 199

9

8

IS 8418:1999

Doc. No. MED 20 (1431)P

FIG. 3 : AUXILIARY SELF PRIMING PUMP WITH MAIN PUMP

FIG. 4 : SELF PRIMING PUMP WITH BUILT-IN EJECTOR

FIG. 5 : TEST SET UP

IS 8034 : 2002

Doc No. MED 20 (1432)P

1

For BIS USE ONLY

PROPOSED Draft Standard

SUBMERSIBLE PUMPSETS - SPECIFICATION

(Third Revision of IS 8034)

Draft standard Prepared by Last date for comments is

Dr R Subramanian, M/s SIEMA , Coimbatore May 6th

, 2015.

1 SCOPE This standard specifies the technical requirements for single or multistage centrifugal pump with single phase or three phase a.c. induction motor operated electric submersible pumpsets, commonly used in boreholes (borewells or tubewells) for handling clear, cold water for application in agriculture, water supply, etc. 2 REFERENCES The Indian Standards listed at Annex A contain provisions which, through reference in this text, constitute provision of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards. 3 UNITS AND TERMINOLOGY In addition to the units and terminology specified in 2 and 3 of IS 5120 and for motors as specified in IS 1885 (Part 35), IS 9283 as may be applicable. In addition, the following shall also apply. 3.1 Static Water Depth

It is the depth of water level below the ground level when the pump is not in operation. 3.2 Draw-Down

It is the elevation difference between the depth of static water level and the consistent standing water level in tube well during pump in operation.

4 SUBMERGENCE It is the minimum height of water level after draw-down above the suction casing. 5 CHARACTERISTICS OF CLEAR, COLD WATER Clear, cold water shall mean water having the characteristics specified below:

a) Turbidity : 50 ppm,(Silica Scale) Max b) Chlorides : 500 ppm, Max

IS 8034 : 2002


c) Total solids : 3000 ppm, Max d) pH : 6.5 to 8.5 e) Temperature : 33ºC, Max f) Specific gravity : 1.004, Max

g) Hardness (as CaCO3), (drinkingwater) : 300 mg, Max

NOTES a) If the range of pH value of water pumped is between 6.5 and 7.5 and also the chloride content is less than 100 ppm, the

bronze components of pump may be made of any grade of bronze. However, if the range of pH is between 6.5 and 8.5, and the chloride content exceeds 100 ppm, only zinc free bronze fitted construction or stainless steel fitted construction, shall be permitted.

b) If any characteristics of the water differ from those specified in 4, the pump details shall have to be agreed between the manufacturer/supplier and the user In such cases, the characteristics shall be specified in the order.

6 NOMENCLATURE Nomenclature of the parts commonly used in submersible pumpsets shall be as given in Fig. 1. 7 CONSTRUCTIONAL FEATURES 7.1 General The submersible pumpsets described herein generally comprise the following:

a) Pump sub-assembly, b) Motor sub-assembly, c) Coupling, d) Non-return valve, e) Discharge casing (if provided) either integral or separate, and f) Cable and cable guards.

7.2 Material of Construction There are number of recognized materials of construction available to meet the needs of submersible pumpsets handling clear, cold water. Typical materials for few components are indicated below merely for guidance of the manufacturer and user:

Sl.No. Component Material of Construction

1. Shaft sleeve Bronze grade LTB 2, 3,4 or 5 of IS 318 or 12 percent chromium steel grade X 04 Cr 12, X 12 Cr 12 and X 20 Cr 13 conforming to IS 6911 or IS 6603

2. Casing wear ring (if provided)

Bronze grade LTB 2, 3, 4 or 5 of IS 318 or Nitrile rubber or Plastic

3. Bush Bronze grade LTB 2, 3 or 4 of IS 318 or Nitrile / cutless rubber

4. Discharge casing (if provided)

Cast iron grade FG 200 of IS 210 or Plastic

IS 8034 : 2002


3

5. Impeller Bronze grade LTB 2 of IS 318 or Stainless steel grade X 12 Cr 12 of IS 6911 or IS 6603 or Plastic

6. Pump bowl/diffuser

Cast iron grade FG 200 of IS 210 or Plastic

7. Pump shaft Stainless steel grade X 04 Cr 12, X 12 Cr 12 or X 20 Cr 13 of IS 6603

1) Suction casing Cast iron grade FG 200 of IS 210

NOTE —The materials listed are to be considered as only typical and indicative of minimum requirements of the material properties. The use of materials having better properties is not prejudiced by the details above provided materials for components in bearing contact with each other do not entail galling, corrosion, magnetic induction, etc

7.2.1 To benefit from the advancement in technology of plastics, thermoplastic materials, such as, polyphenylene oxide (PPO), polycarbonate, acetal, nylon 66, PTFE, ABS, polyester PETP, etc, may be used for pump parts like shaft sleeve, casing, impeller wearing ring, bowl/diffuser, etc. However, typical materials of the main parts are indicated below for the guidance of the manufacturer and the user: Sl. No.

Name of the Part Material

1.

Impeller

Glass filled polyphenylene oxide1) (modified

PPO), glass filled polycarbonate1) properties

shall be as given below:

Properties Modified Polyphenylene Oxide

Polycarbonate

Hardness (Rockwell) M 90/L 106 M 91

Coefficient of linear, m/m°C thermal expansion

4 × 10-5, Max 3 × 10-5, Max

Water absorption, 24 h at 23°C, percent

0.06, Max 0.29, Max

Notched impact strength Izod, J/m

80, Min 100, Min

Specific gravity 1.21 ± 0.03 1.35 ± 0.03

Tensile strength at break, N/mm2

90, Min 90, Min

Elongation at break, percent 4-6 3

Mould shrinkage, percent 0.2-0.4 0.2-0.5

Glass content, percent 20, Min 20, Min

2. Bowl/diffuser

Polyphenylene oxide (modified PPO), polycarbonate, polyacetal or polypropylene

3. Wearing ring PTFE, ABS or Nylon 66

IS 8034 : 2002


4. Shaft sleeve

Polyethylene (LD/HT), Nylon 66,PTFE, polypropylene

1) Glass filling is extremely essential for these grades of plastics in view of abrasion resistance and better life to the end users.

7.2.2 Gaskets, Seals and Packings

7.2.2.1 Gaskets, seals and packings used for clear, cold water pumps shall conform to those specified in IS 5120.

7.2.2.2 The motor / motor portion shall be provided with a breathing attachment like bellows, Diaphragm etc. to compensate the volumetric of water inside the motor due to change in the temperature.

7.2.3 The motor / motor portion shall be protected from ingress of borewell water, sand and other foreign matter by means of cable glands, rubber seals etc. 7.2.4 All the materials and components for the motor shall be suitable for application in respect of corrosion resistance and mechanical performance continuously under water. 7.2.5 The rotor of the wet type submersible motor shall be provided with suitable coating to protect it from corrosion under water. 8 DESIGN FEATURES 8.1 Typical Design Features of Components of Pump for Guidance 8.1.1 The pump shaft may be guided through bearings. Bearings may be provided in mixed flow pumps for each stage. In case of radial flow pump, bearings may be provided in suction and discharge casing, while in case of intermediate bearings, suitable positions may be selected in the overall span.

8.1.2 The pump may be equipped with replaceable bearing and wearing ring, wherever provided. 8.1.3 The inlet passages of the suction casing may be designed to reduce entry losses of the inlet flow. 8.1.4 The strainer on the suction casing may offer the best compromise between restraining the large solids from entering the pump and retaining the suction losses to the minimum. 8.1.5 The outer periphery of the pump casing may have provision for securing the cable and cable guards over the cable, so as to prevent damage to the cable.

8.1.6 The construction of borewell shall conform to IS 2800 (Parts 1 and 2). The maximum outside diameter of pumpsets corresponding to nominal diameter of the tubewell is as given below: (As per IS 14536)

IS 8034 : 2002


5

Nominal Diameter of the Tubewell Maximum Outside Diameter of Submersible Pumpsets (mm) (mm) 100 98 115 108 150 146 200 196 250 245 300 296

8.1.7 The pump loading shall be as per clause 11.1.5

8.1.8 The pump efficiency shall be as per clause 11.4 8.1.9 The prime mover electric motor suitable for the pumps shall be of continuous duty as

specified in IS / IEC 60034-1.

8.1.10 Voltage and Frequency Variation

8.1.10.1 Submersible motor shall be capable to operate in the voltage and supply frequency for Category “A” or Category “B”

8.1.10.1.1 Category ‘A’ The motors shall be capable of delivering rated output with

a) The terminal voltage differing from this rated value by not more than ±6 percent, b) The frequency differing from its rated value by not more than ±3 percent; and c) Any combination of (a) and (b).

8.1.10.1.2 Category ‘B’ The motor shall be capable of delivering rated output with

a) The terminal voltage differing from this rated value by not more +6 percent and –15 percent; b) The frequency differing from its rated value by not more than ±3 percent; and c) Any combination of (a) and (b).

8.1.11 The manufacturer shall have a system of controlling dimensional accuracy within a scheme of fits and tolerance limits. The system shall help interchangeability and fitment at site of replacement spares during repair and maintenance.

9 GENERAL REQUIREMENTS 9.1 The general requirements for the pump shall be as given in IS 5120. 9.2 Casing

IS 8034 : 2002


9.2.1 Pump casing shall be of robust construction and shall be tested to withstand Hydrostatic Pressure Test. 9.3 Impeller The impeller may be of enclosed or semi-open type. 9.4 Shaft 9.4.1 The shaft shall be of adequate size to transmit the required power. 9.4.2 The surface finish of the shaft or of the protecting sleeve of the pumpsets having journal bearings shall be 0.75 m Ra Max, pertaining to the bearing contact surfaces.

9.5 Balancing 9.5.1 In case of 2-pole submersible pumpset, the impeller and rotor shall be dynamicall balanced to Grade G6.3 of IS 11723 (Part 1).

9.5.2 In case of 4-pole submersible pumpset, the impeller shall be statically or dynamically balanced and rotor shall be dynamically balanced to Grade G6.3 of IS 11723 (Part 1).

9.5.3 The plastic and sheet metal impeller need not be balanced. 9.5.4 Balancing here means the balancing of the unbalanced rotating mass in the impeller an not balancing of the axial hydraulic thrust in the impeller.

9.6 Cable

9.6.1 Cables used shall be as per IS 694. 9.6.2 The Flat / Round cable shall be insulated and sheathed with suitable polymer. It shall be 3 core or 4 core type. The size of the conductor shall be adequate and suitable for continuous use under water and in air. The length of the cable shall be minimum 2 m unless otherwise specified by the customer. 9.6.3 The size of the conductor and the length of cable should be suitably selected so that the voltage drop between the control panel and the motor terminal does not exceed three percent of the rated voltage. 9.6.4 In case a joint is required to be made between the lead cable supplied with the motor and the user’s cable, a detailed procedure to make water tight joining shall be supplied by the motor manufacturer. 9.6.5 If four core cable is used, the fourth core is to be used for earthing.

9.7 Direction of rotation 9.7.1 The direction of rotation of pumpsets is designated clockwise or anti-clockwise as observed when looking at the pump stage from the driving end.

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7

9.7.2 The direction of rotation shall be clearly and securely marked by incorporating an arrow on the pumpset.

9.8 Terminal marking 9.8.1 Terminal markings shall be in accordance with IS / IEC 60034-8. 9.9 Typical installation 9.9.1 Since the motor and the pump are directly coupled, or closed coupled, the manufacturer shall indicate the minimum size of the borehole in which the submersible pumpset shall be erected and suspended freely.

9.9.2 The pumpset shall be installed as per guidelines laid down in IS 14536 or as per the recommendation of the manufacturer. A typical sketch of submersible pumpset installation is shown in Fig. 2.

9.9.3 The manufacturer shall specify the minimum submergence of pump unit at duty point.

9.9.4 Provision for Earthing

9.9.4.1 Earthing of the motor shall be done as per IS 9283 in accordance with the relevant provisions of IS 3043.

9.9.4.2 In case of PVC pipes used as discharge pipe, a separate non corrosive, low resistance conductor from motor earth terminal to control panel earth terminal shall be provided for earthing.

9.9.4.3 In case non corrosive GI pipes and clamps are used for the purpose of earthing the motor, earthing connection may be made to the discharge pipe clamp and to the control panel earth terminal. 9.10 Submersible Motors 9.11 Submersible motors suitable for borewell submersible pumpsets are classified based on

their construction are as follows.

a) Wet Type Water Filled Submersible Motors. b) Wet Type Oil Filled Submersible Motors. c) Resin Filled Submersible Motors.

9.11.1 Single Phase Motors 9.11.1.1 Rated Voltage and rated frequency 9.11.1.2 The preferred rated voltage shall be 240 V. The preferred rated frequency shall be 50 Hz. 9.11.1.3 Motor designed for operation at voltages other than 240 V shall be considered as complying with this standard provided they comply in all respects except full load current (maximum), which shall be changed in inverse proportion of the voltage.

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9.11.1.4 Rating 9.11.1.4.1 The preferred output ratings of the motors for submersible pumpsets shall be 0.37, 0.55, 0.75, 1.1, 1.5 and 2.2 kW.

9.11.1.5 Types of Motors

a) Capacitor Start Induction Run motor (CSIR). b) Capacitor Start and Run motor (CSR). c) Capacitor Start and Capacitor Run motor (CSCR).

9.11.1.6 Rated Speed Preferred rated speed shall be those corresponding to two poles and four poles motors. 9.11.2 Three Phase motors 9.11.2.1 Rated Voltage and rated frequency 9.11.2.2 The preferred rated voltage shall be 415 V. The preferred rated frequency shall be

50 Hz. 9.11.2.3 Motor designed for operation at voltages other than 415 V shall be considered as

complying with this standard provided they comply in all respects except full load current (maximum), which shall be changed in inverse proportion of the voltage.

9.11.2.4 Ratings 9.11.2.4.1 The preferred output ratings of the motors for submersible pumpsets shall be 1.1, 1.5,

2.2, 3.7, 5.5, 7.5, 9.3, 11,13,15,18.5,22,26,30,37,45,55,63,67 and 75 kW. 9.11.2.5 Types of Motors 9.11.2.5.1 Three phase Squirrel cage induction motors 9.11.2.6 Rated Speed 9.11.2.7 Preferred rated speed shall be those corresponding to two poles and four poles motors. 10 TESTS FOR ELECTRICAL PERFORMANCE ON SUBMERSIBLE MOTOR 10.1 GENERAL 10.1.1 Routine and type test on submersible motor shall be performed as specified in 16.1 and 16.2 of IS: 9283. The general requirements of the motor with regard to site conditions, Voltage and frequency, Type of enclosures, methods of cooling, Materials, Duty-rating, Terminal marking and Earthing shall be in accordance with IS 9283. 10.1.2 While conducting routine and type tests on submersible motor for electrical performance, supply voltage shall be the rated voltage and frequency shall be within ± 3 percent of rated frequency.

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9

10.1.3 In case of three-phase submersible motor, the value of the current (amperes) shall be the average value of currents (amperes) measured in all the three phases. 10.1.4 Performance values of 2 pole three phase motors of less than 1.1 kW and exceeding 75 kW rating shall be as declared by the manufacturer. 10.1.5 However for three phase motors above 75 kW rating, the declared value of efficiency shall not be lesser than 75 kW value.

10.1.6 Performance values of 2 pole single phase motors of other ratings below 0.37 kW and exceeding 2.2 kW shall be declared by the manufacturer. 10.1.7 However for single phase motors above 2.2 kW rating, the declared value of efficiency shall not be lesser than 2.2 kW value.

10.1.8 Performance values of 4 pole single phase and three phase motors shall be as declared by the manufacturer 10.1.9 However, in case of pumpset, motor need not be tested for full load test. 10.2 Insulation resistance test Insulation resistance tests shall be as per IS 9283 10.3 High voltage test High voltage test shall be as per IS 9283 10.4 Leakage current Test The maximum leakage current value shall be not more than 50 milli Amps at rated voltage at no load. The motor shall be placed on either a rubber mat or a wooden base or any other insulated base. A voltage equal to rated voltage shall be applied to any supply line and accessible outside metal parts of the motor. The resistance of the test circuit shall be 2000±50 ohms. Note — For safety purpose it shall be ensured during installation that the earthing is capable of taking care of leakage current. 10.5 Temperature Rise Test 10.5.1 Temperature rise test for winding shall be carried out on sample pumpset a) at rated voltage and supply frequency within ± 3 percent of rated frequency, and b) at 85 percent of rated voltage and supply frequency within ± 3 percent of rated frequency.. 10.5.2 Temperature rise test at rated voltage Set the load for the observed maximum value of the current in the specified operating head range of the electric monoset at the rated voltage and supply frequency and continuously run the pumpset for 2 h. Stop the pumpset and measure the winding resistance value and water temperature value within 30 s.

IS 8034 : 2002


Temperature rise computed by resistance method shall not exceed 35°C. 10.5.3 Temperature rise test at reduced voltage Before starting the test, ensure the motor winding resistance value nearest to the cold resistance value of the rated voltage temperature rise test. The pumpset shall continuously run at maximum value of the current in the specified operating head range at rated voltage. After reducing the voltage to 85 percent of rated voltage, in this condition, continuously run the pumpset for 1 h. Stop the pumpset and measure the winding resistance value and water temperature value within 30 s. Temperature rise computed by resistance method shall not exceed 45°C. 10.5.4 During the tests the water temperature shall not exceed 45°C. 10.5.5 For conducting temperature rise test, the pump itself shall be used for loading the motor. 10.5.6 The temperature rise test at reduced voltage shall not be applicable for category ‘A’

Submersible motors. 10.6 Determination of temperature rise of winding by resistance method

The temperature rise (t2-t1) may be obtained from the ratio of the resistance by the formula:

((t2+235) / (t1+235)) = R2 / R1

Where

ta = temperature (°C) of external cooling medium (water) at the end of the test,

t2 = temperature (°C) of the winding at the end of the test,

R2 = resistance of the winding at the end of the test,

t1 = temperature (°C) of the winding (cold) at the moment of the initial resistance

measurement, and

R1 = initial resistance of the winding (cold).

For practical purposes, the following alternative formula may be found convenient:

(t2-ta) = (R2-R1) / R1)*(235+t1) + (t1-ta) 10.7 Breakaway (starting) Torque Test 10.7.1 The minimum value of breakaway (starting) torque as percentage of rated torque, with the rated voltage and frequency applied across the terminals shall be as given in the Tables -1, 2, 3, 4 & 5 for three phase and single phase motors for applicable motor types/ rating. 10.7.2 This test may be made at a reduced Voltage, when a current at least equivalent to full load current is being taken by the motor.

10.8 Speed

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11

Preferred rated speed shall be those corresponding to two poles and four poles. The speed shall be measured as per IS 9283 10.9 Routine test Following shall constitute the routine test for electrical performance on submersible motor shall be as per IS 9283

a) Insulation resistance test (Before high voltage test only) b) High voltage test c) No load running of motor and reading of current, voltage, power and speed d) Locked rotor reading of voltage, current and power

The requirements and values shall be in accordance with those specified in IS 9283 as may be applicable. 10.10 Type test

Following shall constitute the type test for electrical performance on submersible motor shall be as per IS 9283

a) Insulation resistance test (Both before and after the high voltage test) b) High voltage test c) Measurement of stator resistance. d) No load running of motor and reading of Voltage current, power input and speeds. e) Reduced voltage running up test at no load to check the ability of the motor to run up to

full speed on no load with 60% of the rated voltage applied to the motor for three phase motors and 75% of the rated voltage applied to the motor for single phase motors.

f) Locked rotor reading of voltage, current and power and torque of motors g) Breakaway (Starting) torque. h) Leakage current test at rated voltage at no load. i) Temperature rise test at rated voltage j) Temperature rise test at reduced voltage k) Momentary over-load test (as per agreement between the manufacturer and the

purchaser); Note — Temperature rise test however shall be done as per Clause 9.5 Reduced voltage Temperature rise test shall not be applicable for Catagory ‘A’ submersible motors.

The requirements and values shall be in accordance with those specified in IS 9283 as may be applicable.

11 TEST FOR HYDRAULIC PERFORMANCE ON PUMP FOR SUBMERSIBLE PUMPSET

11.1 Sampling

The sampling and criteria of conformity for hydraulic performance shall be as per IS 10572: 1983. except for lot size up to 25. The sampling for lot size up to 25 shall be as given below

Lot Size Sample Size

upto 7 1

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8 to 15 2 16 o 25 3

11.2 Laboratory Tests

The testing of performance of the pumps shall be in accordance with IS 11346. Testing procedures as given in IS 11346 shall be followed. A typical testing arrangement for submersible pumpset is given in Fig. 4.

i. Head Measurement 11.3 Measurement of total head (see Fig. 3 of IS 11346-2002). The total head is made up of

- Vertical distance between pumping water level to gauge centre distance in metres ( Z ); - Delivery gauge reading in metres in water column ( h ) and - Velocity head in metres (Vd

2/2g) Therefore, Total head H = Z + h + Vd

2/2g.

ii. Flow Measurement Measurement of flow shall conform to 3.1.1 of IS 11346.

iii. For Current and Power Measurement, Ammeter and Watt meter of adequate capacity shall be used.

11.4 Hydrostatic Pressure Test Hydrostatic pressure test shall be carried out on individual pressure boundary part or pump as a whole in assembled condition at 1.5 times the maximum pressure (at zero discharge) and this pressure shall be maintained for 2 minutes.

12 GUARANTEE AND TOLERANCES ON PUMPSET PERFORMANCE

12.1 Guarantee of Performance 12.1.1 The pumpset shall be guaranteed for their performance of the nominal volume rate of flow and the nominal head at the guaranteed point. The overall efficiency of the pumpset shall be guaranteed at the declared point only. 12.1.2 The guarantee shall be deemed to have been met with, if the measured values of head, volume rate of flow and overall efficiency are within the limits indicated as per clause 8 of IS 11346. However, after applying the tolerance, overall efficiency value shall not be less than that derived from Fig. 4 and Fig 5. The pumpset shall be tested at rated conditions and the maximum current consumption of the pumpset at the operating head range shall be verified. The actual verified current shall not be less than 75 percent of the maximum declared current at the rated voltage.’ Note: the above clause is to ensure proper rating of pumpset.

12.1.3 The pumpset shall be guaranteed at the nominal duty point. The same pumpset may also be deemed to have met the guarantee if the users’ required duty point lies within the specified

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13

tolerance of head (± 4 percent) and discharge (± 7 percent) of the nominal duty point and also meets the non-overloading requirements. 12.1.4 Submersible motor shall not get overloaded in the specified operating head range at rated voltage and supply frequency.

12.1.5 The pump shall be capable to give discharge without overloading the prime mover within the permissible current limit at rated voltage and supply frequency as specified in column 3 of Tables 1 to 5, at minimum + 10 percent and minimum – 25 percent of the guaranteed duty point head up to 20 m. Above 20 m, the pump shall be capable to give discharge without overloading the prime mover within the permissible current limit at rated voltage and supply frequency as specified in column 3 of Tables 1 to 5, at minimum + 10 percent and minimum – 25 percent of the guaranteed duty point head or ± 3 m, whichever is of lesser range. 12.1.6 The tolerance shall apply to guaranteed duty point only. 12.1.7 Performance at rated voltage and supply frequency is actual performance of the set. This is better than performance at rated speed, since in the entire operating head range speed of motor is higher than rated speed, as motor is running in under loaded condition. 12.1.8 The manufacturer shall specify the minimum submergence of pump unit at duty point. 12.2 Head and Discharge 12.2.2 Pump performance shall be declared at the rated voltage and rated frequency. Following affinity laws shall be applied for correction of performance at rated frequency.

a) Discharge (Q) f

b) Head (H) f2

c) Power (P) f 3

(Where f = supply frequency) No correction shall be applied for current. 12.2.3 The pumpset shall be guaranteed at the nominal duty point. The same pumpset may also deemed to have met the guarantee if the new duty point lies within the specified tolerance of head (± 4 percent) and discharge (± 7 percent) of nominal duty point and meets all other pump performance characteristics specified. 12.3 Current 12.3.2 The rated current of motor (maximum) as given in the tables – 1, 2, 3, 4 & 5 for three phase motors and single phase motors for applicable motor rating. 12.3.3 The rated current of motor (maximum) is given in the corresponding table for applicable motor rating are for preferred rated voltage only. For other voltages, it shall be in inverse proportion to the preferred rated voltage. 12.3.4 Manufacturer shall declare the rated current of the motor less than or equal to the rated current (maximum) of the motor as given in the corresponding table for applicable motor rating.

IS 8034 : 2002


12.3.5 To arrive at the permissible limit of maximum current at rated voltage in the operating head range for checking the non overloading requirement in the operating head range of the pumpset, the rated current of motor (maximum) at rated voltage as given in the corresponding table for applicable motor rating multiply by 1.07. 12.3.6 For other voltages, the permissible limit of maximum current in the operating head range shall be in inverse proportion to the preferred rated voltage.

12.3.7 In the case of lesser value declaration on the rated current of motor (maximum) by the manufacturer, 7% plus tolerance on the declared rated current of motor (maximum) shall be allowed for arrive the permissible limit of maximum current in the operating head range for checking the non overloading requirement in the operating head range.

12.4 Pump Efficiency 12.4.2 The efficiency in figure 4 and 5 represents for three or more stages of pumps

a) For two stage pump, multiply efficiency given by a factor 0.98. b) For single stage pump, multiply efficiency given by a factor 0.97.

12.4.3 The motor efficiency factor of motor ratings not given in the Table 1,2,3,4 and 5 shall be as declared by the manufacturer. The motor efficiency factor of motors used with pumpsets suitable for bore sizes more than 200 mm shall be as declared by the manufacturer but it shall be not less than the motor efficiency factor of motors of same rating for 200 mm bore size. 12.4.4 Efficiency of the pumpsets having declared duty points beyond the efficiency lines on either side may be declared by the manufacturer and applicable tolerance applied. Where the point lies in between the efficiency lines, the higher value be taken as minimum efficiency. 12.4.5 The efficiency chart includes non-return valve losses. 12.5 Overall Efficiency 12.5.2 For overall efficiency of the pumpset, multiply pump efficiency by corresponding motor efficiency factor as given in the Table 1,2,3,4 and 5. 12.5.3 The minimum value of the pump efficiency of the submersible pumpset at duty point declared by the manufacturer shall be as given in Fig. 4 and Fig. 5.

12.5.4 Where the pump efficiency point for the declared duty head per stage and discharge lies in between the pump efficiency lines, the higher pump efficiency line value is taken as minimum pump efficiency shall be as given in the Fig - 4 to Fig - 5.

12.5.5 For arriving overall efficiency (minimum) of the pumpset, multiply pump efficiency (minimum) value by motor efficiency factor shall be as given in the Table-1, 2, 3 for three phase motors and in Table-4, 5 for single phase motors for applicable motor rating.

12.5.6 A superior value of overall efficiency at declared duty head per stage and discharge value may be declared by the manufacturer, and applicable tolerance shall be applied. After applying tolerances, it should be meet the minimum Overall efficiency requirements.

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15

12.5.7 Pump efficiency (minimum) of the pumpsets having declared duty point beyond the pump efficiency (minimum) lines on either side may be declared by the manufacturer and applicable tolerance applied.

12.6 Prime Mover Rating To ensure the proper rating of the pumpset, the pumpset shall be tested at rated conditions and the current (maximum) consumption of the pumpset in the operating head range shall be verified. The actual verified current shall not be less than 75 percent of the maximum declared current at the rated voltage. "Note - The above clause is to ensure proper rating of pump set" 13 PERMISSIBLE INACCURACIES IN MEASUREMENTS 13.1 In all commercial acceptance tests for agricultural pumps, a certain tolerance shall be allowed to the manufacturer on his guarantee to cover the inaccuracies of the equations for volume rate of flow, errors of observation and unavoidable errors of the instruments employed. 13.2 The permissible inaccuracy in the measurement of various quantities and all pertinent apparatus used shall be as indicated in IS 11346. However, measuring equipments with higher accuracy class may also be used. 14 MARKING AND PARAMETERS TO BE DECLARED BY THE MANUFACTURER

14.1 A name plate of corrosion-resistant material shall be affixed on the pumpset with the following details:

a) Manufacturer’s name or trade-mark, if any; b) Model; c) Serial No.; d) Number of stages; e) Bore size, Min; f) Head, at nominal duty point; g) Discharge, at nominal duty point; h) Overall efficiency; i) Motor rating (kW); j) Rated speed (rpm); k) Maximum current (amp); l) Rated voltage (V) m) Rated frequency (Hz) n) Category of Motor o) Connection Star, Delta, Star/Delta, CSR, CSCR p) Type of duty (whether continuous or not); q) Delivery size; and r) Head range for non-overloading requirements.

14.2 BIS Certification Marking 14.2.2 The submersible pumpsets may also be marked with BIS Standard Mark.

IS 8034 : 2002


14.2.3 The use of the Standard Mark is governed by the provisions of the Bureau of Indian Standards Act, 1986 and the Rules and Regulations made thereunder. The details of conditions under which a licence for the use of the Standard Mark may be granted to manufacturers or producers, may be obtained from the Bureau of Indian Standards. 15 INFORMATION TO BE FURNISHED BY THE PURCHASER When enquiring or ordering pumps to this standard, the user may furnish the following information to the suppliers:

a) Name of the purchaser,

b) Address of the purchaser,

c) Installation site,

d) Number of pumps required,

e) Spare parts required,

f) Pump operating conditions:

1. Capacity........l/min, l/s or m3/h. 2. Number of poles of motor. 3. Total head, alternatively, sketch of the pipe line giving information, such as, static delivery pipe diameter and length, distance between point of discharge, pipe fittings and valves used,etc, may be given. 4. Total depth of casing pipe. 5. Static water depth. 6. Tube well capacity at predicted draw-down.

g) Description of the well: 1. Installation of the pump in:

I. open well, II. tube well,

III. open well with a boring, and IV. Others.

2. Minimum inside diameter of the tubewell or casing pipe. 3. Total depth of open well/deep well. 4. Total depth of casing pipe. 5. Static water depth. 6. Well developed to.... l/min at.... metre draw-down.

h) Site conditions: 1. Height above mean sea level in metres, and 2. Details of quality of water with respect to all the characteristics as given in 4.

j) Power supply:

1. Type of supply (single-phase / three phase) 2. Frequency (Hz)

1. Voltage (V), and 2. Variation in voltage/frequency.

k) Accessories (state whether the following items are required):

1. Sluice valve,

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17

2. Reflux valve, 3. Pressure gauge, 4. Rising main pipe and delivery bend/ elbow, 5. Type of installation stages in the entire system, 6. Water level indicator, 7. Voltage stabilizer, 8. Automatic starting and stopping device (optional), 9. Starter—direct on the line or star-delta or indicate starting method, 10. Voltmeter, 11. Ammeter, 12. Single phasing preventers, 13. Water level guard, and 14. Low voltage protector.

NOTE – Serial no. 6 to 14 may be arranged in a seperate control panel.

16 INFORMATION TO BE FURNISHED BY THE SUPPLIER If purchaser demands, the supplier shall furnish the following information while supplying the pumpset to this standard.

a) Type designation of pump and submersible motor, b) Details of pump, 1. Method of lubrication (normally the parts of the submersible pumpset are lubricated by the

pumped liquid itself. If any other type of lubrication is adopted, it shall be indicated; 2. Minimum bore well diameter in mm; 3. Number of stages; 4. Outside diameter of the bowl, the maximum diameter of the pump fitted with non-return

valve and maximum overall diameter of the pumpset including the cable guard, mm; 5. Discharge.......l/s; 6. Total head.........m; 7. Speed........rpm; 8. Overall efficiency at duty point...... percent; and 9. Minimum submergence at duty point.......m.

c) Details of motor: 1. Rating.....kW, 2. Type.......... in accordance with IS 9283, 3. Details of power supply, 4. Number of poles of motor, and 5. Maximum current at rated voltage and frequency.

d) Accessories: 1. Suitable starter, 2. Main switches, 3. Ammeter and voltmeter, 4. Pressure gauge, 5. Water level indicating relays, 6. Automatic starting and stopping device, 7. Reflux valve and sluice valve, and 8. Erection clamps and special spanners, if any.

IS 8034 : 2002


e) Additional information to be furnished with the supply, if required. 1. Performance curves:

i. Discharge vs head curve, ii. Discharge vs overall efficiency, iii. Discharge vs current,

2. Instructions for installation and maintenance, and 3. Weight of the pump motor together in kg and that of cables in kg/m length.

Table 1 - Values of Performance Characteristics for 2-Pole, 415 Volt, 50 Hz Three Phase, Water Filled Submersible Motors for bore size Nominal 100mm shall have maximum OD of Motor 98 mm.

Motor Rating Maximum Current

Permissible Limit of Maximum Current in the Operating Head Range for Checking the Non-

overloading Requirements

Minimum Starting Torque (In the terms of Percentage of Full

Load Torque)

Motor Efficiency

Factor

kW A A Percent

(1) (2) (3) (4) (5)

1.1 4.0 4.3 125 56

1.5 4.8 5.1 125 60

2.2 6.9 7.4 125 63

3.0 9.0 9.6 125 63

3.7 10.6 11.3 125 64

4.5 12.6 13.5 125 67

5.5 15.5 16.6 125 68 NOTES

1. Maximum current limits specified are for 415V rated voltage. For other voltages, it shall be in inverse proportion to rated voltage.

2.For three phase motors, the value of current shall be taken as average value of the current mesured in three phases

3. Values given in col 3 are 1.07 times of the values given in col 2.

4. Performance values of 4-pole three phase motors and 2-pole three phase motors of less than 1.1kW and exceeding 5.5kW rating shall be as

declared the manufacturer.

5. However, for three phase motors above 5.5kW rating, the declared value of efficiency shall not be lesser than 5.5kW value.

6. Motor efficiency factors shall be applied for Fig. 4 and Fig. 5 to arrive the minimum-overall efficiency of the pumpset.

Table 2 - Values of Performance Characteristics for 2-Pole, 415 Volt, 50Hz Three Phase, Water Filled Submersible Motors for bore size Nominal 150mm shall have maximum OD of Motor 146mm

Motor Rating

Maximum Current

Permissible Limit of Maximum Current in the Operating

Head Range for Checking the Non-overloading

Requirements

Minimum Starting Torque (In the

terms of Percentage of Full

Load Torque)

Motor Efficiency Factor

kW A A Percent

(1) (2) (3) (4) (5)

1.1 3.3 3.5 125 57

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19

1.5 4.5 4.8 125 66

2.2 6.5 6.9 125 67

3.0 8.5 9.1 125 67

3.7 10.0 10.7 125 68

4.5 12.0 12.8 125 70

5.5 14.5 15.5 125 73

7.5 19.5 20.9 125 74

9.3 25.0 26.7 125 75

11.0 29.0 31.0 125 76

13.0 34.0 36.4 125 77

15.0 39.0 41.7 125 78

NOTES


2. For three phase motors, the value of current shall be taken as average value of the current mesured in three phases






Table 3 - Values of Performance Characteristics for 2-Pole, 415 Volt, 50 Hz Three Phase, Water Filled Submersible Motors for bore size Nominal 200mm shall have maximum OD of Motor 196mm

Motor Rating

Maximum Current

Permissible Limit of Maximum Current in the Operating

Head Range for Checking the Non-overloading

Requirements

Minimum Starting Torque (In the terms of Percentage of

Full Load Torque)


kW A A Percent

(1) (2) (3) (4) (5)

3.0 8.5 9.1 125 69

3.7 10.0 10.7 125 70

4.5 12.0 12.8 125 72

5.5 14.5 15.5 125 75

7.5 19.5 20.9 125 76

9.3 25.0 26.7 125 77

11.0 29.0 31.0 125 78

13.0 34.0 36.4 125 79

15.0 39.0 41.7 125 80

IS 8034 : 2002


Table 3 - Values of Performance Characteristics for 2-Pole, 415 Volt, 50 Hz Three Phase, Water Filled Submersible Motors for bore size Nominal 200mm shall have maximum OD of Motor 196mm

18.5 48.0 51.3 125 80

22.0 57.0 61.0 125 80

26.0 66.0 70.6 125 81

30.0 76.0 81.3 125 81

37.0 85.0 91.0 125 82

45.0 100.0 107.0 125 82

55.0 120.0 128.4 125 83

63.0 135.0 144.5 125 83

67.0 144.0 154.1 125 84

75.0 158.0 169.1 125 84

NOTES


2. For three phase motors, the value of current shall be taken as average value of the current mesured in three phases






Table 4 - Values of Performance Characteristics for 2-Pole, 240 Volt, 50Hz Single Phase, Capacitor Start & Run (CSR), Capacitor Start & Capacitor Run (CSCR), Water Filled

Submersible Motors for bore size Nominal 100mm shall have maximum OD of Motor 98mm

Motor Rating

Maximum Current

Permissible Limit of Maximum Current in the Operating Head Range for Checking the Non-overloading

Requirements

(CSR) Minimum Starting

Torque (In the terms of

Percentage of Full Load Torque)

(CSCR) Minimum Starting




kW A A Percent Percent

(1) (2) (3) (4) (5) (6) 0.37 5.3 5.7 30 125 40.0 0.55 6.2 6.6 30 125 42.0 0.75 7.5 8.0 30 125 46.0 1.1 10.5 11.2 30 125 49.0 1.5 13.8 14.8 30 125 52.0 2.2 19.8 21.2 30 125 56.0

NOTES

1. Maximum current limits specified are for 240 V rated voltages. For other voltages, it shall be in inverse proportion to rated voltage.

2. Values given in col. 3 are 1.07 times the values given in col 2.

3. For Motors of other ratings below 0.37kW the performance values shall be declared by the manufacturer.

4. Motor efficiency factors shall be applied for Fig. 4 and Fig. 5 to arrive the minimum overall efficiency of the pumpset.

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21

NOTES

1. Maximum current limits specified are for 240 V rated voltage. For other voltages, it shall be in inverse proportion to rated voltage.

2. Values given in col. 3 are 1.07 times the values given in col 2.

3. For Motors of other ratings below 0.37 kW the performance values shall be declared by the manufacturer.

4. Motor efficiency factors shall be applied for Fig. 4 and Fig. 5 to arrive the minimum overall efficiency of the pumpset.

5. For 2-Pole, 415 V, 50 Hz Three Phase, Oil filled or Encapsulated Oil Filled, Submersible motors for Bore Size Minimum 100 mm and

Maximum OD of Motor 98 mm, performance values shall be as declared by the manufacturer.’

Table 5 - Values of Performance Characteristics for 2-Pole, 240 Volt, 50 Hz Single Phase Capacitor Start & Run (CSR), Capacitor Start & Capacitor Run (CSCR), Oil Filled / or encapsulated oil filled, Submersible Motors for bore size Nominal100mm shall have maximum OD of Motor 98mm.

Motor Rating

Maximum Current

Permissible Limit of Maximum Current in the Operating Head Range for Checking the Non-

overloading Requirements

(CSR) Minimum Starting



(CSCR) Minimum Starting



Motor Efficiency

Factor

kW A A Percent Percent

(1) (2) (3) (4) (5) (6) 0.37 4.1 4.4 30 125 43.0 0.55 5.0 5.3 30 125 45.0 0.75 6.7 7.1 30 125 50.0 1.1 9.5 10.1 30 125 53.0 1.5 12.5 13.3 30 125 56.0 2.2 16.0 17.1 30 125 62.0

IS 8034 : 2002


1A RADIAL FLOW PUMP 1B MIXED FLOW PUMP NOTE - These figures illustrate the nomenclature of commonly used parts and does not specify any particular design feature.

FIG. 1 NOMENCLATURE OF SUBMERSIBLE PUMPSETS IN GENERAL

IS 8034 : 2002


23

FIG. 2 TYPICAL SUBMERSIBLE PUMPSET INSTALLATION

6 m min.

IS 8034 : 2002


FIG. 3 TYPICAL TESTING ARRANGEMENT FOR SUBMERSIBLE PUMPSETS

IS 8034 : 2002


25

ANNEX A

(Clause 2)

LIST OF REFERRED INDIAN STANDARDS

IS No. Title

IS No. Title

210 Grey iron castings - Specification

(fourth revision)

9283 Motors for submersible

pumpsets- Specification

(first revision)

318 Specification for leaded tin bronze ingots

and castings (second revision)

10572 Methods of sampling for pumps

11346 Code of acceptance tests for

agricultural and water supply

pumps (first revision) 694

Polyvinyl Chloride Insulated Unsheathed-

- And Sheathed Cables/cords With Rigid

And--Flexible Conductor For Rated

Voltages--Up To And Including 450/750

V Code of practice for construction and

testing of tubewells/borewells

2800

(Part I)

Part 1 Construction (second revision)

11723 (Part I) Mechanical vibration – Balance

quality requirements of rigid

rotors: Part 1 Determination of

permissible residual unbalance

(first revision)

(Part 2) Part 2 Testing (first revision)

5120 Technical requirements for rotodynamic

special purpose pumps (first revision)

14536 Selection, installation, operation

and maintenance of submersible

pumpset - Code of practice 6603 Stainless steel bars and flats -

Specification (first revision)

6911 Stainless steel plate, sheet and strip -

Specification (first revision)

IS 8034 : 2002


FIG. 4 MINIMUM PUMP EFFICIENCY IN PERCENT FOR (2-POLE) SUBMERSIBLE PUMPSET.(UP TO 62 LITERS PER SECOND)

27

FIG. 5 MINIMUM PUMP EFFICIENCY IN PERCENT FOR (2-POLE) SUBMERSIBLE PUMPSET.(UP TO 4 LITERS PER SECOND)

IS 12255:1997)

Doc. No. MED 20 (1433)P

1

For BIS USE ONLY


CENTRIFUGAL JET PUMP - SPECIFICATION

( Second Revision of IS 12225)

Draft standard Prepared by Last date for comment

Shri Nirmal C Tiwari, M/s KBL, Pune May 6th

, 2015.

1 SCOPE

This standard specifies the requirements of single and multistage centrifugal jet pump used

for pumping water from wells beyond suction capacity of horizontal / vertical end suction

centrifugal pumps.

2 REFERENCES

The Indian Standards given in Annex A are necessary adjuncts to this standard.

3 PRINCIPLE OF OPERATION OF CENTRIFUGAL JET PUMP

Centrifugal jet pump is a combination of a Centrifugal pump and a jet unit. This combination

helps in lifting water from a depth beyond the suction lift capacity of the centrifugal pump

alone.

The centrifugal pump (see Fig. 1) is primed, started and is made to operate on optimum total

head. This head can be created by system delivery head or pressure regulating valve. For

efficient operation of the combination, the maximum discharge head (delivery head of

centrifugal pump) is to be maintained by adjusting the pressure regulating valve to a total

head of centrifugal pump head minus six meters. A part of this pressurized water from the

centrifugal jet pump passes through a pressure pipe to Jet Assembly Nozzle. Above the

nozzle, a venturi tube is fitted concentrically in the Jet Assembly body. The nozzle converts

the pressure energy of the water into velocity.

This high velocity water from the nozzle enters the venture and accelerates the surrounding

water in the annular area between nozzle and venturi, thereby creating vacuum in the

annular area. Due to this vacuum, water is sucked from the well into the jet body through a

foot valve. The momentum transfer takes place in the mixing throat of venturi. The kinetic

energy of water is converted into pressure energy in the diverging portion of the venturi,

called the diffuser. This pressurized water rises in the delivery pipe of the jet Assembly, which

in turn acts as a suction pipe of the centrifugal pump, to a level within the suction lift capacity

of the centrifugal pump to enable the centrifugal pump to suck the water. The quantity

drawn from well is delivered as net system discharge and the driving quantity is recirculated.

The level from which the centrifugal pump sucks the water is taken as six metres below the

centrifugal pump centre line as optimum level.

4 TYPES OF JET ASSEMBLY

Three types of jet arrangement used in Jet Centrifugal Pumps are given in 4.1, 4.2 and 4.3.

4.1 Twin Type

IS 12255:1997

Doc. No. MED 20 (1433)P

2

In twin type of jet Assembly, delivery (suction pipe of centrifugal pump) pipe and pressure

pipe connecting the centrifugal pump and jet assembly run parallel to each other (see Fig. 2).

Delivery pipe (suction pipe of centrifugal pump) and pressure pipe are screwed together to

the jet assembly body and are lowered together.

FIG. 1 : SCHEMATIC OPERATIONAL DIAGRAM OF A CENTRIFUGAL JET PUMP

4.2 Duplex Type

In duplex type of jet assembly, two concentric pipes are fitted to connect the centrifugal

pump and jet assembly. The inner pipe acts as a delivery pipe of jet Assembly, which in turn is

the suction pipe of centrifugal pump. The annular area between the outer pipe and the inner

pipe acts as pressure pipe to supply water to the jet arrangement nozzle.

Similar to twin type jet assembly, delivery pipe (suction pipe of centrifugal pump) and outer

pipe are screwed together to the jet assembly body and are lowered together. The concentric

flow is bifurcated into a twin flow at the ground level by using a duplex head / well adopter,

which is connected to the centrifugal pump (see Fig. 3).

4.2 Packer Type

The construction of the packer type arrangement is similar to the duplex type except that the

bottom portion of the annular space between the two pipes below the nozzle is sealed

through a packer housing (see Fig. 4 and Fig. 4A). The packers are bucket washer fitted to the

bottom-most point of the jet unit. The packer housing is screwed at the bottom-most point of

the outer pipe. This enables to lower outer pipe and then inner pipe independently thereby

resulting in ease of installation.

5 PUMP FOR CENTRIFUGAL JET PUMP

5.1 Constructional features of the centrifugal monoset pump shall conform to IS 9079.

IS 12255:1997)

Doc. No. MED 20 (1433)P

3

5.2 General Requirements

5.2.1 The pump shaft should be of adequate size to transmit the required power over the

entire head range .

5.2.2 Pump casing shall be of robust construction and shall be tested to withstand 1.5 times

the maximum discharge pressure for 2 minutes.

1. Priming Unit

2. Pressure Control Valve

3. Pressure Gauge

4. Monoset Pump

5. Slip Coupling

6. Clamp

7. Jet Assembly

8. Foot Valve

9. Delivery Pipe Jet Pump (Suction Pipe of

Centrifugal Pump )

10. Pressure Pipe

FIG. 2 : TYPICAL INSTALLATION FOR TWIN TYPE CENTRIFUGAL JET PUMP

IS 12255:1997

Doc. No. MED 20 (1433)P

4

5.2.3 If the pump casing is subjected to the hydrostatic test as per clause 5.2.2 before

assembly, then during routine testing of the assembled pump, the packing and seal leakage

detection can be done with pressurized air at 1 kg/cm2.

5.3 Cables used shall be as per IS 694.

5.4 Voltage and Frequency Variation

Motor of the monoset pumps shall be capable of delivering the rated output:

a) With the terminal voltage differing from its rated value by not more than +6

percent and -15 percent.

b) The frequency differing from its rated value by not more than + 3 percent.

c) Any combination of (a) and (b)

6 MATERIAL OF CONSTRUCTION

It is recognized that a number of materials of construction are available to meet the

requirements for centrifugal jet pump. A few typical materials are indicated below for

guidance of the manufacturer and the user.

Sl.

No.

Component Materials of Construction

1. Nozzle Brass Grade HTBI of IS 304 or Bronze LTB2 of IS 318 or

Stainless steel grade 04Cr13, 12Cr13, 20Cr13 of IS 6603

or suitable thermoplastics

2. Venturi Brass Grade HTBI of IS 304 or Bronze LTB2 of IS 318 or

Stainless steel grade 04Cr13, 12Cr13, 20Cr13 of IS 6603

or suitable thermoplastics

3. Foot Valve Bronze grade LTB2 of IS 318 or Brass grade HTB1 of IS

304 or Cast iron grade FG 200 of IS 210 or suitable

thermoplastics

4.

Strainer of Foot Valve Brass grade HTB1 of IS 304 or suitable thermoplastics or

Stainless steel

5.

Jet Assembly Body Cast iron grade FG 200 of IS 210 or Bronze grade LTB2

of IS 318 or Brass grade HTB1 of IS 304 or suitable

thermoplastics

6. Impeller Cast iron grade FG 200 of IS 210 or Bronze grade LTB2

of IS 318 or Brass grade HTB1 of IS 304 or suitable

thermoplastics

7. Casing Cast iron grade FG 200 of IS 210

8.

Pressure Regulating

Valve

Body : Brass Grade HTBI of IS 304 or Bronze LTB2 of IS

318 or Stainless steel grade 04Cr13, 12Cr13, 20Cr13 of IS

6603 or suitable thermoplastics

Diaphragm : Neoprene rubber or nitrile rubber

Valve Seat : Bronze grade LTB2 of IS 318 or suitable

thermoplastics

9.

Slip Coupling (Optional)

for Twin Type

Body : Cast iron grade FG 200 of IS 210.

Sealing Ring : Neoprene rubber or nitrile rubber.

10.

Packer Head / Duplex

Head and Flanges

Cast iron grade FG 200 of IS 210.

NOTE — Suitable thermoplastics may include such as Polyphenylene oxide (PPO), Polycarbonate (PC), Acetal (polyacetals)

resins, Nylon 6 or Nylon 66, Glass filled nylon, Polytetrafluoroethylene (PTFE), Acrylonitrile butadiene styrene copolymers

(ABS), Polyethylene terephthalate (PET), Ultra high molecular weight polyethylene (UHMWPE), etc.

IS 12255:1997)

Doc. No. MED 20 (1433)P

5

1. Priming Unit 7. Clamp

2. Pressure Control Valve 8. Jet Venturi

3. Pressure Gauge 9. Nozzle

4. Mono Pump 10. Foot Valve

5. Slip Coupling 11. Strainer

6. Duplex Head/Well Adopter

FIG. 3 : TYPICAL INSTALLATION FOR DUPLEX TYPE CENTRIFUGAL JET PUMP

IS 12255:1997

Doc. No. MED 20 (1433)P

6

IS 12225 : 1997

IS 12255:1997)

Doc. No. MED 20 (1433)P

7

1 Priming Unit

2 Pressure Control Valve

3 Pressure Gauge

4 Mono Pump

5 Slip Coupling

6 Packer Head

IS 12255:1997

Doc. No. MED 20 (1433)P

8

7 Clamp

8 Jet Pump Venturi

9 Nozzle

10 Foot Valve

11 Delivery Pipe Jet Pump/Suction Pipe of Centrifugal Pump

12 Pressure Pipe

FIG. 4 : TYPICAL INSTALLATION FOR PACKER TYPE CENTRIFUGAL JET PUMP

IS 12225 : 1997

IS 12255:1997)

Doc. No. MED 20 (1433)P

9

FIG. 4A SECTION THROUGH A PACKER TYPE JET

PUMP ASSEMBLY

7 SELECTION OF CENTRIFUGAL JET PUMP

Centrifugal jet pump shall be selected according to IS 12699.

IS 12255:1997

Doc. No. MED 20 (1433)P

10

8 PERFORMANCE CHARACTERISTICS

8.1 Factor Affecting Performance

The submergence of jet pump (Assembly) below water level affects the overall performance of

the centrifugal jet pump. All the capacities shall be given for the pump offset from well of 1.5

m for horizontal jet and the submergence of jet pump (Assembly) shall be specified by the

manufacturer along with minimum operating pressure. The method of obtaining higher

submergence by supplying the input water to the jet pump (Assembly) foot valve through

pressure tank shall be as given in Annex 6 and Fig. 5. Submergence is the level of water above

the nozzle of the jet unit.

8.2 Performance Curves

The tabulated readings shall be drawn as a set of performance curves.

a) Discharge Q2 vs total head,

b) Discharge Q2 vs depth to low water level for centrifugal jet pump,

c) Discharge Q2 vs power input, and

d) Discharge Q2 vs current.

8.3 The performance of centrifugal jet pump shall be given as shown in Table 1 and Table 1A

by the manufacturer.

9 TESTING

9.1 SAMPLING

The sampling shall be as specified in IS 10572.

9.2 Method of Testing

Centrifugal jet pump shall be fitted with the jet assembly through proper sizes of pipes of

required lengths with respective orifice plates. One pressure gauge shall be fitted to the

delivery pipe of the jet assembly which is the suction pipe of the centrifugal pump. Another

pressure gauge shall be fitted to the discharge pipe (delivery pipe of centrifugal pump) of the

centrifugal jet pump. By throttling the discharge valve, the following readings shall be taken:

a) Total head (on the pressure gauge connected to the discharge pipe which is delivery

pipe of centrifugal pump),

b) Corrected ejector head (on the pressure gauge connected to the suction pipe of the

centrifugal pump which is the delivery pipe of the jet pump (Assembly),

c) Discharge,

d) Power input,

e) Speed of the motor,

f) Voltage, and

g) Current.

The above readings shall be tabulated in the form of a test report for each pump as given in

Table 2.

IS 12255:1997)

Doc. No. MED 20 (1433)P

11

At least three test points, that is, duty point, maximum and minimum head shall be taken. The

manufacturer shall give the maximum jet setting depth (ejector head + 6m) for the various

types of pumps offered at which the maximum ejector efficiency is obtained. All the heads,

discharge and power shall be corrected to the rated speed.

9.3 Testing Method for Centrifugal Jet Pump for Including Pipe Friction by the Use of Orifice

Plate

The depth to low water level, total head, discharge and power input shall be declared by the

manufacturer at the duty point and the testing shall be carried out only for the duty point

declared by the manufacturer.

Orifice plates as shown in Fig. 6 with diameters calculated in accordance with the procedure

given in Annex C shall be used in the pressure pipe and the delivery pipe (suction pipe of

centrifugal pump) of the centrifugal jet pump to take into account the field friction. Examples

are given in Annex C with Fig. 5, 8, 10, 11, 12 and 13 which give the schematic and test set up

diagram for twin, packer and duplex type centrifugal jet pump.

9.4 Testing of the motor

The motor of moonset pump shall conform to the testing requirements given in IS 9079 except

for temperature rise test. The temperature rise test shall be conducted at the maximum

current, in the operating Depth to Low Water Level (DLWL) range. The temperature rise shall

not exceed the limits specified in Table 7 of IS / IEC 60034-1.

10 TOLERANCES

At rated frequency, the pump shall give a minimum of 92 percent of the rated depth to low

water level and minimum of 92 percent of the rated total head at a minimum of 92 percent

rated discharge. The pump shall not take more than 110 percent of the declared power input

in the range between 92 percent of the rated discharge to rated discharge. The maximum

current in the operating range of depth to low water level shall not exceed the 107 percent

values specified in IS 996 or IS 7538 as the case may be in order to avoid overloading of the

prime mover. For 2 pole single phase motor, the value of maximum full load current shall be

declared by the manufacturer. An example is given in Annex D with Fig. 11 to 13.

11 MARKING

11.1 The manufacturer shall furnish the following information: a) Depth to low water level, that is, the distance from centrifugal pump base centre line (for vertical pump) and suction inlet centre line ( for horizontal pump) to the water level in m b) Discharge in LPH

c) Submergence at duty point in m d) i) For duplex / packer type : Outer / Inner / Pressure / discharge (delivery of centrifugal pump) pipe sizes in mm, and

ii) For twin type : Jet delivery (centrifugal pump suction), pressure / discharge (

delivery of centrifugal pump ) pipe sizes in mm;

e) Depth to low water level range in m;

f) Total head (depth to low water level + discharge head) in m;

g) Power input in kW;

IS 12255:1997

Doc. No. MED 20 (1433)P

12

h) Rated speed in rev/min; and

j) Maximum current in A.

11.2 Standard Marking

11.2.1 The centrifugal jet pump may also be marked with the Standard Mark.

11.2.2 The use of Standard Mark is governed by the provisions of the Bureau of Indian

Standards Act, 1986 and the Rules and Regulations made thereunder. The details of

conditions under which a license for the use of Standard Mark may be granted to

manufacturers or producers, may be obtained from the Bureau of Indian Standards.

IS 12255:1997)

Doc. No. MED 20 (1433)P

13

Table 1A Performance of Twin Type Centrifugal Jet Pump

( Clause 8.3 )

Single Phase / Three Phase

Rating

Jet Unit

Code

Pressure Pipe Dia

Delivery Pipe Dia of

Jet Assembly

(Suction Pipe of

Centrifugal Pump)

Discharge Pipe

Dia ( Delivery

Pipe of

Centrifugal

Pump )

Minimum

c lear

Bore Dia

Minimum Operating

Pressure/ Discharge

Head ( Delivery Head

of Centrifugal

Pump )

Capacity for Different Depths

to Low Water Level from

Centrifugal Pump Centre

mm mm mm mm m Litres per Hour (LPH)

9 m 15 m 25 m

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)

NOTE : Depth to Low Water Level (DLWL) mentioned in col 8, 9 and 10 are only indicative and shall depend upon the individual models

and the respective DLWL ranges.

IS 12255:1997

Doc. No. MED 20 (1433)P

14

Table 1A : Performance of Packer / Duplex Centrifugal Jet Pump

( Clause 8.3 )

Single Phase / Three Phase Type: Packer / Duplex

Rating Jet Unit

Code

Outer

Pipe

Dia

Inner

Pipe

Dia

Pressure

Pipe Dia

Discharge Pipe Dia

(Delivery Pipe Dia of

Centrifugal Pump)

Minimum

Clear Bore

Dia

Minimum Operating

Pressure / Discharge

Head ( Delivery Head of

Centrifugal Pump )

Capacity for Different Depths to

Low Water Level from

Centrifugal Pump Centre

Litres per Hour (LPH)

mm mm mm mm mm m 9 m 15 m 25 m onwards

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11)

NOTE : Depth to Low Water Level (DLWL) mentioned in col 9, 1 0 and 11 are only indicative and shall depend upon the individual models and

the respective DLWL ranges.

IS 12255:1997)

Doc. No. MED 20 (1433)P

15

IS

12225 :

1997

Single/Three

Phase Ref :

Table 2 Test Report for Contrifugal Jet

Pump

( Clause 9.1 )

Name of the

manufacturer: Discharge

in 1/h: Maximum jet OD

in mm:

Depth to low water level

(DLWL): Rated speed in

rev/min:

kW/HP:

Centrifugal jet pump

SI.No.:

Bore size in mm

: Total head in

m:

Frequenc

y:

Pipe size in mm:

Duplex/Packer

Type:

Outer/Inner/Pressure discharge ( Centrifugal pump

delivery): Twin type jet pump:

Jet delivery/Pressure discharge ( Centrifugal pump delivery ):

Sl

No.

Speed Depth to Low Water Level Total Head Actual

Dis-

charge

Voltage Current Motor

Input

Performance at Rated Speed Re-

marks

Ejector

Head

Correc-

tion on

DLW

L

Dis- charg

e Gaug

e

Corre

c-

tion

on

Total Head

Rated

DLWL

Rat

ed

To

Rate

d Dis-

charg

Rate

d

Mot

11

IS 12255:1997

Doc. No. MED 20 (1433)P

16

G1 Z1 G1 + Z1 +

6 G2 Z2 G2 + Z2 tal

He

ad

e or

Input

rev/min m m m m m m 1/h V A kW m m 1/h kW

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

IS 12255:1997)

Doc. No. MED 20 (1433)P

17

1 Pump

2 Gate Valve-1

3 Pressure Tank

4 Gate Valve-2

5 Mono Set let Centrifugal Pump

Combination

NOTE —

Net Ejector head — (G1 + Z ) (G3 + Z )

Net Total Head = ( G2 + Z ) - ( G3 + Z )

IS

12225 : 1

997

IS 12255:1997

Doc. No. MED 20 (1433)P

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6 Gate Valve-3

7 Collecting Tank

8 Pressure Gauge G1 - ( Ejector Head )

9 Pressure Gauge G2 - ( Total Head )

10 Pressure Gauge G3 - ( Submergence )

FIG. 5 INSTALLATION FOR TYPICAL TEST SET UP FOR JET CENTRIFUGAL PUMP COMBINATION WITH SUBMERGENCE

IS 12255:1997)

Doc. No. MED 20 (1433)P

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IS 12225 : 1997

FIG. 6 SYMMETRICAL ORIFICE PLATE

IS 12255:1997

Doc. No. MED 20 (1433)P

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IS 12225 : 1997

FIG. 7 FIELD INSTALLATION DIAGRAM FOR VERTICAL TWIN TYPE

CENTRIFUGAL JET PUMP

IS 12255:1997)

Doc. No. MED 20 (1433)P

21

IS 12225 : 1997

FIG. 8 TESTING INSTALLATION DIAGRAM FOR TWIN TYPE


IS 12255:1997

Doc. No. MED 20 (1433)P

22

A = Horizontal length of pressure pipe, 3 m

B = Horizontal length of delivery pipe, 3 m

*Horizontal length includes equivalent length for bends also.

FIG. 9 FIELD INSTALLATION FOR HORIZONTAL DUPLEX TYPE CENTRIFUGAL JET

PUMP

A = Horizontal length of pressure pipe, 3 m

B = Horizontal length of delivery pipe, 3 m

*Horizontal length includes equivalent length for bends also.

FIG. 9 FIELD INSTALLATION FOR HORIZONTAL DUPLEX TYPE CENTRIFUGAL JET PUMP

IS 12255:1997)

Doc. No. MED 20 (1433)P

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1 Priming Unit 2 Pressure Control

Gate Valve 3 Orifice Plates da

and dd

4 Mono Pump

5 Slip Coupling

6 Duplex Head/Well

Adopter

7 Clamp

8 Jet Venturi

9 Nozzle

10 Foot Valve

11 Strainer

FIG. 10 TESTING INSTALLATION FOR DUPLEX TYPE CENTRIFUGAL JET

PUMP FOR FACTORY SET UP

IS 12255:1997

Doc. No. MED 20 (1433)P

24

IS 12225 : 1997

G1 — Pressure gauge fitted in suction pipe of centrifugal pump which is the delivery pipe of jet pump. G2 — Pressure gauge fitted in discharge pipe.

NOTE — Ejector head = G1 + Z, Total head = G2 + Z

FIG.11 SCHEMATIC TESTING ARRANGEMENT OF MONOSET CENTRIFUGAL JET PUMP

IS 12255:1997)

Doc. No. MED 20 (1433)P

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IS 12225 :

1997

1 Mono Pump 5 Pressure Control Gauge Valve

2 Jet Unit 6 Pressure Gauge G1 and G2

3 Foot Valve with Strainer 7 Suction Pipe of Centrifugal Pump/Delivery

Pipe of Jet Pump ( Dd )

4 Priming Unit 8 Pressure Pipe ( DP )

NOTE — The orifice plate shall be installed at a minimum distance of 10 D from bend on

IS 12255:1997

Doc. No. MED 20 (1433)P

26

the upstream side and pressure gauge shall be installed at minimum of 4 D on the

downstream side of orifice plate.

FIG. 12 TESTING INSTALLATION FOR HORIZONTAL TWIN TYPE


1 Priming Unit

2 Pressure Control Gate Valve

3 Orifice Plates da and dd

4 Mono Pump

5 Slip Coupling

6 Packer/Duplex Head

7 Clamp

8 Jet Pump Venturi

IS 12255:1997)

Doc. No. MED 20 (1433)P

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9 Nozzle

10 Foot Valve

11 Delivery Pipe of Jet Pump/Suction Pipe of Centrifugal Pump ( D d )

1 2 Equivalent Pressure Pipe

13 ( Da )

FIG. 13 TESTING INSTALLATION FOR PACKER/DUPLEX TYPE CENTRIFUGAL JET PUMP

IS 12255:1997

Doc. No. MED 20 (1433)P

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ANNEX A

( Clause 2 )


IS No. Title

210 Grey iron casting (Fourth revision )

304 High Tensile brass ingots and castings (Second Revision)

318 Leaded tin bronze ingots and castings (Second Revision)

694

Polyvinyl Chloride Insulated Unsheathed-- And Sheathed Cables/cords

With Rigid And--Flexible Conductor For Rated Voltages--Up To And

Including 450/750 V Code of practice for construction and testing of

tubewells/borewells

996 Single phase small ac and universal electric motors (Second Revision)

3444 Corrosion resistant alloy steel and nickel base castings for general

applications (Second Revision)

6595(Part 1) Horizontal Centrifugal pumps for clear cold water: Part 1 Agriculture and

rural water supply purposes (Second Revision)

6603 Stainless steel bar and flats. (Under Revision)

7347 Performance of small size spark ignition engines for agricultural sprayers

and similar applications

7538 Three phase squirrel cage induction motors for centrifugal pumps for

agricultural applications

9079 Monoset pumps for clear cold water for agricultural purpose (First

Revision)

10001 Performance requirements for constant speed compression

ignition(diesel) engines for general purpose

10572 Method of sampling pumps

11170 Performance requirements for constant speed compression

ignition(diesel) engines for agricultural purpose

12699 Code of practice for selection, installation, operation and maintenance of

combination centrifugal jet pump.

IS 12255:1997)

Doc. No. MED 20 (1433)P

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ANNEX B

( Clause 8.1 )

METHOD OF TESTING CENTRIFUGAL JET PUMP WITH REQUIRED SUBMERGENCE

B-1 GENERAL

The Submergence of the jet unit below the water level affects the performance of centrifugal

jet pump drastically A jet assembly with inadequate submergence causes cavitation at the

mixing point and great loss in performance.

Every pump has to be declared with the required submergence for optimum performance of

the centrifugal jet pump.

In the test set up, it becomes sometimes impractical to locate the jet unit with the required

submergence since it is very high.

In order to stimulate a pressure tank is used in the test set up as shown in Fig.5:

a) A pressure tank of atleast 5 to 6 times the maximum discharge capacity of centrifugal jet

pump in litres / min to be tested.

b) A centrifugal pump with a head of atleast 15 times that of the maximum submergence

pressure to be created in the pressure tank, with a discharge capacity of atleast twice the

maximum discharge of centrifugal jet pump.

The pressurizing centrifugal pump (1) is connected to the pressure tank through throttle valve

(2) and foot-valve. The pressure tank is connected to the centrifugal jet pump through throttle

valve (4) at the foot-valve entry. A pressure gauge (10) reads the pressure (G3) at the entry to

centrifugal jet pump. A pressure guage (8) reads the ejector head pressure (G1) in the delivery

pipe of jet pump (Assembly) which in turn is the suction pipe of the centrifugal pump of

centrifugal jet pump. A pressure gauge (G2) reads the total head developed by the centrifugal

jet pump. Orifice plates are introduced in the pressure and delivery pipes, to take care of field

pipe friction ( see Fig. 5 ).

B-2 TESTING PROCEDURE

The pressurizing centrifugal pump (1) is started and the valves (2) and (4) are adjusted such

that the gauge (10) shows a head nearer to the required declared submergence. The throttle

valve (6) is adjusted in such a way that gauge (G1) shows a ejector head nearer to the duty

point ejector head plus submergence. Adjust the valves (2) and (4) such that a steady reading

of G3 (duty point submergence) and G1 (duty point ejector head + G3) is reached.

Then, measure Q1, the volume rate of flow, with the help of collecting tank and power input to

the pump. Then, the head readings for given submergence of G3 are:

( G2 + Z)-(G3 + Z ) = Total head

( G1 + Z ) - ( G 3 + Z) = Ejector head

IS 12255:1997

Doc. No. MED 20 (1433)P

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A N N E X C

(Clause 9.2)

TESTING METHOD FOR CENTRIFUGAL JET PUMP INCLUDING PIPE FRICTION BY THE USE

OF ORIFICE PLATES IN TEST SET UP

C-1 GENERAL

The effect of friction in the length of delivery pipe and pressure pipe in the centrifugal jet

pump is stimulated by means of orifice plates in the delivery and pressure pipes. The diameter

of the orifice plate is found by means of equating the head loss in friction in the corresponding

pipe lengths in field use to the head loss by sudden contraction and expansion by the

introduction of orifice plates.

For twin type pumps, the orifice plates are introduced in the corresponding pipe lengths in the

test set up. For packer type pump, the loss in friction is found for the annular area between

the outer pipe and the delivery pipe in terms of an equivalent diameter of a pressure pipe,

and in this pipe, the orifice plate is introduced. The method of locating orifice plates in the

test set-up is shown in Fig. 5, 8, 10, 11, 12 and 13 for different types of pumps. The methods

for calculating the diameter of orifice plate shall be as given in C-2 to C-4. The nominal pipe

size and corresponding pipe inner diameter for calculation of orifice plates are given in

Table 3.

Table 3 : Pipe Inner Diameter for Nominal Sizes of Pipes

( Clause C-1 )

Nominal Pipe Sizes in mm 20 25 32 40 50 65 80 100

Pipe inner diameter for c alculation of

orifice plates in mm 22 27 36 42 53 69 81 106

C-2 SELECTION OF ORIFICE DIAMETER

C-2.1 Terminology

L = length of pipe line;

Dd = inner diameter of delivery pipe of jet unit for twin, packer and duplex;

D'd = outer diameter of delivery pipe of jet unit for duplex and packer only;

Dp = inner diameter of pressure pipe;

Where, dp, dd, da = inner diameter of orifice plates for pressure pipe,

delivery pipe and equivalent pipe, respectively;

hf = head loss in friction in the length;

h = head loss in orifice plate;

f = Darcy-weisbech friction factor,

C = discharge coefficient;

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α = CE = flow coefficient;

β = (dd/Dd) or (dP/DP) or (da'Do);

= diameter ratio of orifice plate to pipe inner diameter;

E = Velocity approach factor;

= (1-β4)-½

p = Mass density = w/g;

Q = qm/p = volume rate flow; and

= Q/A

Where,

A = area of pipe

Δp = pressure loss in orifice plate, and

Δp/w = head loss in orifice plate

C-2.2 The average value of C = 0.6 and f = 0.027 8 has been taken after considering the different diameters of pipe diameter ratio and life of pipe. A 10 percent error in the above results affects only the overall result of pump performance by one percent.

If d is the orifice plate inner diameter:

Qm = α (π/4)d2 √ 2 Δpp

Substituting

qm = PQ

Q = CE(π

= CE(π

= CE(π/ = CE(π/

Allowing for pressure recovery after orifice plates, we can write

Kh = hf

where K is 0.9 up to 40 mm sizes of pipe and 0.8 for higher pipe sizes.

hf = [(fL/D)]×(V2/2g)

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We get,

1/β4 = [C2 f(L/KD) + 1] from [C2 f(L/KD)]

= (1/ß4 - 1)

Substituting

Β = d/D D4/d4 = [C2(fL/KD)+1]

d =

Substituting value of C = 0.6 and f = 0.027 8, the final equation for the diameter of orifice plate as:

d =

This means that if D is in millimetres of the pipe used in the field for the system and L is its length in metres, the equivalent friction loss shall be created by using an orifice plate of diameter d. It shall be noted that while using this equation, L value shall be taken as the length of pipe in the field minus the length of pipe used in factory set-up for substituting in the equation, equivalent friction loss shall be created by using an orifice plate of diameter d.

C-3 DIAMETER OF ORIFICE PLATE FORTHE ANNULAR AREA OF PACKER/DUPLEX TYPE PUMP

The frictional loss in the annular area for the pressure pipe portion of a packer/duplex type pump is given as

= CE β2(π/4)D2

Q = CE β2 A

But Q/A = V, therefore squaring both the sides and equating, we get:

by:

If an equivalent pipe of inner diameter Da and length Le is selected to give the same amount of head loss in friction as a single pipe,

h = (V2/2g) ×

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(2)

Equating equations (1) and (2), we get

D'd is outer diameter of the delivery pipe of jet unit for packer/duplex

So in the packer/duplex type, the orifice plate is set in a horizontal length above the duplex/packer head using a pipe of convenient diameter Da for the pressure pipe. For this pipe dia, the equivalent length Le is calculated for the annular actual pipe length, L, used in the field.

Then to create the frictional loss, an orifice plate of diameter da is selected so that:

Where L is in metres and D is in millimetres. Then

Diameter of orifice plate to be used in the horizontal equivalent pressure pipe line is :

C-4 MODEL CALCULATIONS FOR SELECTION OF ORIFICE PLATE OF TWIN TYPE JET PUMP

C-4.1 Example 1: (see Fig. 6 and 7)

Calculate the diameter of orifice plates to be used in twin type centrifugal jet pump of size 50 mm × 40 mm

— Delivery pipe of jet assembly (suction pipe of centrifugal pump) × pressure pipes.The duty point ground to low water level is 25 m and at duty point, the pump requires four metres submergence and the pump is a vertical pump having one metre pipe above the ground level, medium class pipes are used in the factory set-up, three metre length is used for testing with 2.5 m submergence.

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Lf = length of pipe used in field.

= ground to low water level + submergence + vertical distance above the ground level to centrifugal pump.

= 25 + 4 + 1 =30 m.

L = Length of pipe to be taken for friction calculation.

= pipe length used in field — pipe length used in test set up.

= 30–3 = 27m.

The inner dia of 50 mm medium class pipe is

Dd = 53 mm

The inner dia of 40 mm medium pipe is

Dp = 42 mm

The diameter of orifice plate for the delivery side of the jet pump (which in turn is the suction pipe of centrifugal pump)

dd = Diameter of orifice plate in jet pump (Assembly) delivery, which is the suction pipe of centrifugal pump.

Since the legnth of the pressure pipe also is the same, diameter of orifice plate in pressure pipe

= 24.86 mm

So the above size of orifice plates are fitted to the delivery pipe of jet pump (Assembly) which is the suction pipe of centrifugal pump and pressure pipe of jet pump (Assembly). It is always convenient to have the centrifugal pumps in a horizontal position for both vertical and horizontal sets for easy test set-up.

C-4.2 Example 2 (see Fig. 3 and 8)

Calculate the diameter of orifice plates for the same centrifugal jet pump if it is of a horizontal

packer type/duplex type using an 80 mm outer pipe, 50 mm

For the annular pipe inner pipe and in the horizontal position it uses 50 mm equivalent

pressure pipe. The length of vertical concentric pipe used in the field is 25 m ground to low water

level, four meter submergence and three metre horizontal pipes of 50 mm each, including the

equivalent length for the bend. In the factory test set-up, the length of concentric pipes used is

three metres and in the horizontal portion two pipes of 50 mm of two metres length is used

including the equivalent length for bends. In all cases, medium class pipes are used. The

submergence at factory set-up is 2.5 m.

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The pump centre line in both field and factory set-up above ground level is one metre.

Calculation : For the inner pipe

Length of inner pipe at field = 25 + 4 + 4 = 33 metres.

Length of pipe used in factory set-up = 2 + 1 + 3 = 6 metres.

Length of pipe Ld used for friction calculation = 33 – ( 2 + 1 + 3 ) = 27 metres

(Refer Fig. 9 and Fig. 10)

Dd = inner diameter of inner pipe = 53mm,

that is, delivery pipe of jet pump. Therefore, diameter of orifice plate,

Do = inner dia of outer pipe of 80 mm

= 80.8 mm

Dd = outer diameter of inner pipe which is the delivery pipe of jet pump

= 60.3 mm

Length of concentric pipe used in the field: 25+4 = 29 m

Length of pipe used in the factory set-up: 3 m

Le = Length to be taken for calculating friction. 29-3 = 26 m

Let De = Diameter of equivalent pipe

= Diameter of pipe used in pressure pipe

= 53 mm

This equivalent length for pressure pipe,

= 63.39 m

Length Le to be taken for friction calculation

= L'e + (3+1-2-1)

= 64.39 m

Diameter of orifice plate to be used in equivalent pipe for the annular area

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ANNEX D

( Clause 10 )

EXAMPLE TO CHECK THE DECLARED VALUESA centrifugal jet pump of nominal 0.75 kW rating

has following declared values :

If the characteristic curve passes through the hatched portion or is above the hatched portion the

sample pump conforms to the requirements. Similarly if the discharge vs input, power curve is

below 110 percent line, that is, in this case 1.32 kW ( = 1.2kW × 1.1) at the duty point of 1 000 LPH

the sample pump satisfies the requirements. Thus of the four pumps whose characteristic curves

are given in the Fig. 14, Fig. 15 and Fig. 16.

DLWL : 25 m

DLWL Range : 18 to 30 m

Discharge : 1 000 1/h

Total head : 44 m

Power Input : 1.2 kW

Maximum current: 6.0 A

In this figure lines have been drawn given for the declared values and also 92 percent of discharge, 92 percent of total head, 92 percent of DLWL, 110 percent of power input and for 107 percent of the maximum current declared in the DLWL range. Characteristic curves have been drawn of four jet pumps of above declared values. The hatched portions shown in the figure show the areas of deviation permitted (on the negative side) in respect of discharge vs DLWL and discharge vs total head.

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I. Sample 1 : Satisfies the requirements

II. Sample 2 : Fails in input power, since at the duty point the input power is 1.34 kW

III. Sample 3 : Fails in discharge vs DLWL

IV. Sample 4 : Fails in maximum in the current e operating range of DLWL.

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IS 12255:1997)

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S

C

H

A

R

G

E

FIG. 15 DISCHARGE VS DLWL AND TOTAL HEAD

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FIG. 16 DISCHARGE VS CURRENT AND DEPTH TO LOW WATER LEVEL

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FOR BIS USE ONLY PROPOSED DRAFT Standard

PART 3 RECOMMENDED PUMPING SYSTEM FOR DOMESTIC PUMPS

(Third Revision of IS 10804 )

Draft standard Prepared by Last date for comment

Shri Nirmal C Tiwari, M/s KBL, Pune May 6th, 2015.

1 SCOPE This standard covers the recommended domestic pumping system consisting of various matching and energy efficient components like Centrifugal pump monoset or Regenerative pumps or Borewell submersible pumpset or Openwell submersible moonset ), suction and delivery pipes, valve (foot valve, if any) and necessary pipe fittings. 2 REFERENCES

The Indian Standards given in Annex A are necessary adjuncts to this standard. 3 RECOMMENDED PUMPING SYSTEM

Different components of pumping system shall conform to the following Indian Standards besides matching with the other components. (See Fig. 1 and 2).

Sl. No. Pumpset Relevant Indian Standards Criteria

i) Centrifugal pump :

Electric monoset

Regenerative monoset

Submersible pumpset

Openwell submersible monoset

IS 9079 : 2002 IS 8472 : 1998 IS 8034 :2002 IS14220:1994

The Pump shall be selected in such a way that it shall operate close to maximum pump efficiency during peak demand period.

ii) Prime mover :

Electric motor

IS 996: 1979

The prime mover rating shall be equal to or more than the power consumption in the entire operating range.

iii)

Suction and delivery pipes or piping system

IS 1239 (Part 1) : 2004 or IS 4984:1995 or IS 4985: 2000 or IS 12231:1987

The sizes of pipes shall be selected in such a way that the friction head (hf) shall not exceed 10 percent of total equivalent length of pipe upto delivery point. The data given in Tables 1(A) and 1(B) shall be used to determine approximate sizes of pipes.

iv)

Foot valve (if any) IS 10805 :1986 Size of valve shall be equal to the size of suction pipe.

v)

Pipe fittings (bends) IS 1239 (Part 2):2004 or IS 10124 (Part 8): 1988 or IS 13593:1992

The sizes of bends, and other fittings shall be matching with the sizes of M.S. pipes, HDPE pipes or RPVC pipes to be used for piping system.

NOTES — 1) An example for selection of pumpset for domestic requirement is given in Annex B. 2) The duty point discharge shall be considered for deciding pipe size.

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4 COMPUTATION OF FLOW RATE 'Q', AND TOTAL HEAD 'H' 4.1 The quantity of water required shall be determined as per the guidelines given in IS 1172 : 1993. A minimum of 70 to 100 litres per head per day may be considered adequate for domestic needs of urban communities. 45 litres per head per day may be taken for flushing requirements. 4.2 Accordingly, the sizing of storage tank may be determined depending upon no. of occupants and some reserve capacity. 4.3 Static Head requirement shall be determined as per the vertical distance from the water level in the water source to the discharge point. 4.4 Based on the quantity of water required and material of pipe, the suction and delivery pipe sizes shall be selected from Table 1(A) and 1(B). (In case of submersible pumpset, suction pipe is not required). 4.5 The length of piping required shall be determined from the length of pipe from water level to pump and pump to delivery point. This shall be further increased by minimum one metre required for the submergence to avoid air entrainment. Equivalent pipe length 2 metres per bend shall be added to the length of piping for no. of bends used. 4.6 The friction losses in the pipes shall be computed for the pipe length worked out as per 4.3, referring friction loss tables 2(A) and 2(B). The friction loss in the given pipe length shall be calculated as per following formula : hf = FL x pipe length / 100 4.7 Friction losses in foot valve ( if provided ) shall be calculated by multiplying 0.8 to the value of velocity head as per table 2(A) and 2(B). 4.8 Total head shall be calculated by adding static head (hst), losses in pipes and pipe fittings (hfp) ( clause 4.5), losses in foot valve ( if any ) ( Cl. 4.6) and discharge velocity head. H = hst + hfp + 0.8Vd

2/2g + Vd

2/2g

5 SELECTION OF PUMPING SYSTEM 5.1 Calculate the flow rate ‘Q’ required considering the storage tank capacity and pump operation time. 5.2 Choose suitable suction and delivery pipes to limit pipe friction losses to a maximum of 10% of total pipe length as given in 4.3. 5.3 Select foot valve as per the size of suction pipe and with ‘K’ factor less than or equal to 0.8 in case of monoset / coupled pumpset. In case of self- priming regenerative and submersible pumpset, foot valve is not required.

5.4 Estimate total head ‘H’ required as given in 4.8. 5.5 Choose the type of pumpset to be used i.e. an centrifugal moonset or self-priming moonset or borewell submersible pumpset or openwell submersible pumpset. 5.6 Select suitable pump from the catalogue. As far as possible, pump shall be selected such that the operating point lie near the middle of the head range given in the performance table of the catalogue.

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All the above components shall conform to relevant Indian standards referred in clause 3.

ANNEX ‘A’


IS No. Title IS No. Title

996 SINGLE-PHASE A.C. INDUSTRIAL MOTORS FOR GENERAL PURPOSE

8472: 1998 PUMPS - REGENERATIVE OR CLEAR, COLD WATER

1172 CODE OF BASIC REQUIREMENTS FOR WATER SUPPLY, DRAINGE AND SANITATION

9079: 2002

ELECTRIC MONOSET PUMPS FOR CLEAR, COLD WATER FOR AGRICULTURAL AND WATER SUPPLY PURPOSES

1239 (Part 1)

STEEL TUBES, TUBULARS AND OTHER WROUGHT STEEL FITTINGS PART 1 : STEEL TUBES

9694 (Part 1): 1987

CODE OF PRACTICE FOR THE SELECTION, INSTALLATION, OPERATION AND MAINTENANCE OF HORIZONTAL CENTRIFUGAL PUMPS FOR AGRICULTURAL APPLICATIONS - PART 1 : SELECTION

1239 (Part 2)

MILD STEEL TUBES, TUBULARS AND OTHER WROUGHT STEEL 21 FITTINGS, PART 2 MILD STEEL TUBULARS AND OTHER WROUGHT STEEL PIPE FITTINGS (FOURTH REVISION)

10124 (Part 8): 2009

FABRICATED PVC-U FITTINGS FOR POTABLE WATER SUPPLIES: PART 8 SPECIFIC REQUIREMENTS FOR 90 DEGREE BENDS

1984

INJECTION CONTAINERS FOR INJECTABLE AND ACCESSORIES - INJECTION VIALS MADE OF GLASS TUBING

10805: 1986

FOOT VALVES, REFLUX VALVES OR NON-RETURN VALVES AND BORE VALVES TO BE USED IN SUCTION LINES OF AGRICULTURAL PUMPING SYSTEMS

4984 HIGH DENSITY POLYETHYLENE PIPES FOR POTABLE WATER SUPPLIES

11346: 2002 TESTS FOR AGRICULTURAL AND WATER SUPPLY PUMPS - CODE OF ACCEPTANCE

4985 UNPLASTICIZED PVC PIPES FOR POTABLE WATER SUPPLIES -

12231: 1987

UNPLASTICIZED PVC PIPES FOR USE IN SUCTION AND DELIVERY LINES OF AGRICULTURAL PUMP SETS

8034 SUBMERSIBLE PUMPSETS – SPECIFICATION

14220: 1994 OPENWELL SUBMERSIBLE PUMPSETS

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ANNEX ‘B’ A. EXAMPLE FOR SELECTION OF PUMPING SYSTEM FOR DOMESTIC REQUIREMENT A typical example is described for selection of a centrifugal and regenerative monoset : 1. Installation details Suction branch

Height of pump centre line from water level : 3 m

Submergence : 1 m

Offset pipe length : 3 m

One bend

One foot valve ( in case of self priming pump, foot valve is not required ). Delivery branch

Height of delivery pipe from pump centre Iine ( 2 stories house with height of overhead tank 3 m ) : 11 m

Offset pipe length : 1 m

One bend : 2. Estimation of flow rate

No. of family members : 6

Minimum water requirement per head per day : 130 litres

Total water required per day : 130 x 6 = 780 litres

Size of overhead tank : 780 + reserve capacity : 1000 litres

Operation time : 30 minutes

Per day pumping required : 26 LPM 3. Selection of pipe size : Decided to use new G.I. pipe of medium series. For selecting galvanized steel pipe for a flow rate of 28 LPM refer table 1. The nominal pipe size for medium class is 20 mm. Hence, Suction pipe of 20 mm and Delivery pipe of 20 mm should be used. 4. Determination of Total Head : Static head considered for the system = 11 + 3 = 14 m Total pipe length to be = Length equivalent to static head + submergence considered for friction losses + Offset length + 2 bends. = 14+1+3 +1+2x2 = 23 m. While we refer the table 2 (A), frictional losses are given for 26 LPM flow rate. Hence, for flow rate 26 LPM, we can interpolate the frictional losses figure as 9.7 m per 100 m pipe length. Hence, friction losses in additional pipe length = 23 x 9.7 / 100 = 2.23 m Losses in foot valve = 0.8 x suction velocity head

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Refer table 2(A) for determining velocity head for 20 mm GI medium series pipe. For 28 LPM flow rate, velocity head is 0.08. However, since, the velocity head values are very small, it can also be ignored for ease of calculation. Losses in foot valve = 0.8 x 0.08 = 0.064 m Hence, Total head = static head + friction loss in piping + friction loss in foot valve + discharge velocity head = 14 + 2.23 + 0.064 + 0.08 = 16.37 m say 16.4 m. Now, with this calculation, we can select a centrifugal monobloc or regenerative pump for 16.4 m head and 28 LPM discharge with minimum power rating. 5. Pump and Piping System Specifications Therefore, pumpset and pumping system details for this typical irrigation requirement are : a. Monoset pump as per IS 9079 : 1989 or Regenerative pump as per IS 8472 Total head (H) = 16.4 m Volume rate of flow (Q) = 28 LPM b. Piping system Foot valve (In case of Centrifugal pump ) 20 mm Straight galvanized pipe 20 mm size Long radius bends 20 mm size .

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Table 1(A) : Permissible Ranges of Volume Rates of Flow in l/s Through Galvanized Steel Pipes to Limit Friction Losses to 10 Percent of the Pipe Length (IS 1239, C = 140)

Grade

Nominal

Size

mm Min Max Min Max Min Max

15 5 15 5 13 5 11

20 15 30 13 28 11 24

25 30 57 28 52 24 45

32 57 116 52 108 45 96

40 116 165 108 160 96 145

50 165 315 160 300 145 275

Medium

Rate of Flow LPM

Light

Rate of Flow LPM

Heavy

Rate of Flow LPM

Table 1(B) : Permissible Ranges of Volume Rates-of Flow in l/s Through RPVC Pipes to Limit Friction Losses to 10 Percent of the Pipe Length (IS 4985, C = 150)

Grade

Nominal

Size

mm Min Max Min Max Min Max

20 - - 5 16 5 15

25 5 30 16 29 15 27

32 30 60 29 58 27 53

40 60 110 58 105 53 96

50 110 200 105 190 96 175

63 200 380 190 350 175 320

Class 6 (1.25 MPa)

Rate of Flow LPM

Class 5 (1.0 MPa)

Rate of Flow LPM

Class 4 (0.80 MPa)

Rate of Flow LPM

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Nominal Pipe Size

mm

Inside Dia mm

Discharge LPM F.L. V.H. F.L. V.H. F.L. V.H. F.L. V.H. F.L. V.H. F.L. V.H.

2 0.30 0.00

4 1.10 0.01

6 2.32 0.01

8 3.96 0.02

10 5.98 0.03

12 8.39 0.05

14 11.16 0.07 2.69 0.02

16 3.44 0.03

18 4.28 0.03

20 5.20 0.04

22 6.21 0.05

24 7.29 0.06

26 8.46 0.07

28 9.70 0.08 3.12 0.03

30 3.54 0.04

35 4.71 0.05

40 6.03 0.07

45 7.50 0.08

50 9.12 0.10

55 10.88 0.12 2.84 0.04

60 3.34 0.05

70 4.44 0.07

80 5.69 0.09

90 7.07 0.11

100 8.60 0.14

110 10.26 0.16 4.91 0.09

120 5.76 0.11

130 6.69 0.12

140 7.67 0.14

150 8.72 0.17

160 9.82 0.19 3.13 0.07

185 4.10 0.10

210 5.19 0.13

235 6.39 0.16

260 7.70 0.20

285 9.13 0.23

300 10.04 0.26

F.L. : Friction loss in meteres in 100 metres pipe length V.H. : Velocity Head in metres

Table 2 (A) - Frictional Losses in metre per 100 metre Pipe Length and Velocity Head

(GI pipe Medium series)

15 20 25 32 40 50

16.2 21.7 27.4 36.1 42.0 53.1

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Nominal Pipe

Size mm

Inside Dia mm

Discharge

LPMF.L. V.H. F.L. V.H. F.L. V.H. F.L. V.H. F.L. V.H. F.L. V.H.

2 0.20 0.00

4 0.72 0.00

6 1.53 0.01

8 2.60 0.02

10 3.93 0.03

12 5.51 0.04

14 7.34 0.05

16 9.39 0.07 3.24 0.03

18 11.68 0.08 4.03 0.04

20 4.90 0.04

22 5.85 0.05

24 6.87 0.06

26 7.97 0.07

28 9.14 0.09 2.56 0.03

30 10.38 0.10 2.90 0.03

35 3.86 0.05

40 4.95 0.06

45 6.15 0.08

50 7.48 0.10

55 8.92 0.12 2.99 0.05

60 10.48 0.14 3.51 0.06

70 4.67 0.08

80 5.98 0.10

90 7.44 0.13

100 9.04 0.16

110 10.79 0.19 3.60 0.08

120 4.23 0.09

130 4.90 0.11

140 5.63 0.12

150 6.39 0.14

180 8.96 0.21 2.89 0.08

210 11.92 0.28 3.85 0.11

240 4.93 0.14

270 6.13 0.18

300 7.45 0.23

330 8.88 0.27

360 10.44 0.33

F.L. : Friction loss in meteres in 100 metres pipe length V.H. : Velocity Head in metres

Table 2 (B) - Frictional Losses in metre per 100 metre Pipe Length and Velocity

Head (RPVC Pipe of Class 5)

17.2 21.4 27.8 34.8 43.6 55.0

20 25 32 40 50 63

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For BIS Use Only

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SPECIFICATION FOR PUMPS FOR FIRE FIGHTING SYSTEM (First Revision of IS 12469)

Draft Standard Prepared by Last date for comment

Shri R S Birajdar, M/s KBL, Pune May 6th, 2015

1 SCOPE

Covers technical requirements of centrifugal fire fighting pumps intended for installation in and around building/industrial plants.

2 DEFINITIONS

In addition to terms already defined in IS 5120:1977 'Technical requirements for rotodynamic special purpose pumps (first revision)', following additional terms shall be applied.

2.1 Corrosion Resistant Material

These are materia ls having resis tance to corrosion equal to or better than that of copper alloy like brass and bronze having minimum copper content of 80 percent.

For sea water application, the materials should have corrosion resistance equal to or better than that of nickel cast iron Grade AFG Nil5Cu 6Cr3 in accordance with IS : 2749-1974 'Specification for austenitic iron castings ( first revision )' .

2.2 Total Head

For a split case or end suction pump, total head is the algebraic difference in KPa b e t w e e n p r e s s u r e s a s m e a s u r e d a t t h e d i s c h a r g e f l a n g e a n d t h e s u c t i o n f l a n g e , c o n n e c t e d to the pump centre line and corrected for changes in velocity head at the points of gauge attachment. For a vertical turbine pump, the total head is the reading of a pressure gauge attached just beyond the discharge flange of the pump in KPa and corrected for the vertical distance from the water level to the centre of the gauge and for the frictional losses encountered in the piping between the uppermost bowl and the point of attachment of the gauge and also corrected for velocity head at the point of pressure gauge.

2.3 Shut-Off Head

The to t a l head developed by a pump a t ra t ed speed wi th no water be ing delivered.

2.4 End Suction Pumps

A horizontal centrifugal pump with suction nozzle axis in line with pump shaft axis and position of nozzle opposite to the stuffing box sid e of the casing. It is intended that these pumps shall be used on a static suction lift condition only if a special provision for automatic priming of the pump is available. These pumps may have one or more stages.

2.5 Split Case Pump

A horizontal centrifugal pump characterized by a casing which is split parallel to the shaft and mounted in the horizontal or vertical position. It is intended that these pumps will be used on a static suction lift condition only if a special provision for separate priming source for the pump is available. These pumps may have one or more stages.

2.6 Vertical Turbine Pump

A vertical axis centrifugal radial, francis or mixed-flow type pump comprising stages which accommodate rotating impellers and stationary bowls possessing g uide vanes. The discharge from the pump unit is coaxial with the shaft and the pump unit is suspended by the column pipe containing a system of vertical shafting for transmitting power to the impellers, the prime mover being external to the flow stream. A typical vertical turbine pump

b) Exceeding 20 but not exceeding 55

c) Exceeding 55 but not exceeding 100

*d) Exceeding 100

(A)

mainly consists of three assemblies, namely, bowl assembly, column assembly and discharge head assembly.

2.7 Multistage Pump

Pumps in which the total head is developed by more than one impeller.

2 .8 Maximum Pump Brake Horse Power

Is the maximum power required by the pump at the rated speed and at any capacity within the operating range of the pump. For the purpose of this standard, operating range would be from 0 flow to 150 percent of the rated flow.

3 GENERAL REQUIREMENTS

3.1 Standard Capacities

3.1.1 The capacity of the pump depends on whether or not tapping(s) for water spray and/or foam protection for tanks/spheres/bullets is (are) taken from hydrant service.

3.1.2 In case there is no tapping from hydrant service, t he capacity of the pump shall be determined by the class of occupancy and the size of i nstallation as given in Table 1 and Table 2 indicates the various classes of nature of risk.

TABLE 1 CLASS OF OCCUPANCY AND SIZE OF INSTALLATION

( Clauses 3.1.2 and 3.1.4 )

SI Nature of Number of Pump Capacity Delivery Pressure

No. Risk Hydrants in 1/s ( m2/h ) at Rated Capacity

kg/cm2

1. Light Hazard a) Not exceeding 20 27 (96 ) 5.6

b) Exceeding 20 but not exceeding 55

c) Exceeding 55 but not exceeding 100

*d) Exceeding 100 47 47 (171) for every additional 125 hydrants or a

part thereof

Note — The total pumping capacity need not be greater than 190 (683) irrespective of the number of hydrant

points.

2. Ordinary Hazard a) Not exceeding 20 38 (137) 7.0

b) Exceeding 20 but not 4 7 ( 1 7 1 ) 7.0 exceeding 55

c) Exceeding 55 but not 76 ( 273) 7.0

exceeding 100

*d) Exceeding 100 76 (273) plus 7/8.8 76 (273) for every additional 125 hydrants or a part thereof

Note — The total pumping capacity need not be greater than 302 (1 0 9 2) irrespective of the number of hydrant points.

3. High Hazard a) Not exceeding 20 4 7 (171 ) 7.0

76 (273) 7/8.8

114 (410) 7/8.8

114(410) plus 7/8.8/10.5 114 (410) for every additional 150 hydrants or a part thereof

4. High Hazard a) Not exceeding 20 Two of 47 (171) 7.0

(B) b) Exceeding 20 but not Two of 76 ( 273 ) 7/8.8

exceeding 55

c) Exceeding 55 but not Two Of 114(410) 7/8.8

exceeding 100

*d) Exceeding 100 Two of 114 (410) 8/10.5 plus one of 114 (410) for every additional 200 hydrants or a part thereof

Note — In case of risks under SI No. 4 where the number of hydrants exceed 500, pumps with a capacity up to

171 1/s (616 m2/h ) are acceptable, provided:

a) the aggregate installed pumping capacity is not less than that worked out in accordance with the table

above, and

b) not more than 25 percent of the installed pumping capacity is disrupted when any one pump is inoperative.

*This provision shall apply in case where the hydrant service has been hydraulically desi gned so that a minimum

running pressure of 3.5 kgf/cm2 is available at the hydraulically most remote discharging point at a pumping

capacity of half of that specified in the chart.

TABLE 2 VARIOUS CLASSES OF NATURE OF RISK

(Clause 3.1.2)

SI Nature of Risk Capacity of Stat ic Storage Exclusively

No. Reserved for Hydrant Service

1 . L i g h t H a z a r d Not less than 1 hour's aggregate pumping capacity with a minimum of 135 000 litres

2 . O r d i n a r y H a z a r d Not less than 2 hours' aggregate pumping capacity

3 . H i g h H a z a r d ( A ) Not less than 3 hours' aggregate pumping capacity

4 . H i g h H a z a r d ( B ) Not less than 4 hours' aggregate pumping capacity

3.1.3 Where pumps are exclusively used for spray or foam system; their capacity shall be governed by the demand of the largest risk.

3.1.4 Where storage tanks containing flammable liquids are protected by a medium velocity water spray system tapped from the hydrant service, the water requirements of the spray system shall be calculated for tanks located in a common dyke which have the largest aggregate shell surface area at a rate of 10 1/min/m

2 (0 1 6 7 1/s/m

2) of tank shell surface area.

The water requirement of the spray system worked out as above shall be loaded for supplementary hose stream protection as under:

Where the largest tank in a dyke has a diameter of

a) Up to 10 m 1 700 1/min

b) More than 10 m and up to 20 m 2 250 1/min

c) More than 20 m 4 500 1/min

If the total water requirement for spray protection and hose stream protection for storage tanks worked out as above exceeds the requirement in accordance with Table 1, the pumping capacity shall be equivalent to the former.

3.1.5 Where storage tanks are protected by a fixed foam system connected to the hydrant service, water requirement for the foam system shall be equivalent to that required by the largest protected tank at a rate of 5 1/min/m

2 of liquid surface area.

Other conditions regarding supplementary hose stream protection, pumping capacity, etc, shall remain the same as for water spray protection.

3.1.6 Where spheres/bullets containing LPG are protected by a medium velocity water spray system fed by the hydrant service, water requirements of the spray system shall be calculated for up to 3 spheres/bullets, having the largest aggregate surface area located within 15 m of each other at a rate of 10 1/min/m` of the surface area. Other conditions for supplementary hose stream protection, pumping capacitor etc, shall remain the same as for the water spray protection.

3.1.7 When the premises are protected by sprinkler installation having elevated tank(s) as one of the main sources of water supply and where the arrangement for filling the tank(s) is taken from the hydrant service, the connection shall be taken directly from the pump to the top of the tank (through stop valve) and not through the hydrant mains.

3.2 Castings — Castings shall be smooth, free from scales, lumps, cracks, blisters, sand holes and defects of any nature which could make them unfit for the use for which they are intended. A casting shall not be salvaged by filling or plugging; however, impregnation may be employed to remove porosity.

3.3 Fasteners — Fasteners exposed to corrosion shall be of corrosion resistant material.

4 CONSTRUCTION ALL PUMPS

4.1 General

4.2 An end-suction or in-line pump shall be of a single- or two-stage construction. A split-

case pump may be of a single-stage or multistage construction. A vertical-turbine pump may

have any number of bowls

and impellers.

4.3 A split-case, vertical-turbine, end-suction, or in-line pump shall have a rated capacity equal

to a value specified in Table 1.

4.4 A casting shall be smooth and free from scale, lumps, cracks, blisters, sand holes, and

defects of any nature that may affect the use for which it is intended. A casting shall not be

plugged or filled, but may be impregnated to remove porosity.

4.5 A bolt, stud, cap screw, or gland swing bolt used to assemble parts subject to stress due to

water pressure shall not be less than 3/8 inch (9.5 mm) in diameter. 4.6 An interior bolt or screw that is exposed to pumped fluid shall be of rolled bronze or other

corrosion-resistant material. 4.7 The maximum stress on any bolt of a pressure-holding casting shall not exceed one-fourth

the elastic limit of the material as computed by using the stress area. The stre ss area is defined

by the equation:

As = 0.7854 (D – (0.9743/n))^2

In which:

‘As’ is the stress area in square inches (m2 * 1550);

‘D’ is the nominal diameter of bolt in inches (mm * 0.04); and

‘n’ is the number of threads per inch (25.4 mm).

The load on the bolts is to be computed on the basis of the water pressure equivalent to the

maximum working pressure over the area out to the centerline of the bolts.

4.8 The maximum combined shear stress for a pump shaft shall not exceed 30 percent of the

elastic limit in tension or be more than 18 percent of the ultimate tensile strength of the

shafting steel used. Compliance with this requirement is to be verified by a review of

manufacturers’ stress calculations.

4.9 The impellers shall be dynamically balanced to the G6.3 balance quality grade in

accordance with the requirements for pump impellers in the Standard for Mechanical

Vibration – Balance Quality Requirements of Rigid Rotors, Part 1: Specification and

Verification of Balance Tolerances, ISO 1940-1.

Exception: The impellers may be statically (single plane) balanced in accordance with ISO

1940-1 if the ratio of the maximum outside diameter to the width at the periphery (including

the shroud but not including the back vane) is equal to or greater than 6.

4.10 Flange dimensions and bolt layouts used in pipe connections shall comply with the

requirements of one of the following standards:

a) Standard for Cast Iron Pipe Flanges and Flanged Fittings, ANSI/ASME B16.1;

b) Standard for Ductile Iron Pipe Flanges and Flanged Fittings, ANSI/ASME B16.42;

or

c) Standard for Pipe Flanges and Flanged Fittings: NPS 1/2 through 24, ANSI/ASME

B16.5, when steel is used

Exception: A pump intended for use in installations where the connection piping has national

pipe flange dimensions that are different from these standards shall be permitted to be

constructed with flanges complying with the national pipe flange standard compatible with

connection piping.

4.11 A threaded opening used for pipe connection shall comply with the requirements in the

Standard for Pipe Threads, General Purpose, ANSI/ASME B1.20.1. Exception: A pump intended for use in installations where the connected piping has national

pipe threads that are different from ANSI/ASME B1.20.1 shall be permitted to be constructed

with threads complying with the national pipe thread standard compatible with the connected

piping.

4.12 A pump shall be provided with the following:

a) Automatic air-release valve (self-venting pumps excluded);

b) Circulation relief valve (except for engine driven pumps for which engine cooling

water is taken from the pump discharge) and;

c) Pressure gauges. 4.13 The minimum internal dimensions of the passages at any point in the impeller shall not

be less than:

a) 5/16 inch (7.9 mm) for a pump rated 1893 L/min or less; or

b) 1/2 inch (12.7 mm) for a pump rated more than 1893 L/Min.

4 HORIZONTAL SPLIT

5.1 Case and End Suction Pumps

5.1 Pump Casing

The pump casing shall be axially split or radially split with back pullout features to permit

examination of impeller(s) and other interior parts without disturbing suction or discharge piping.

5.2 A drain opening shall be provided so that all the water in pump casing can be drained. Minimum size of drain shall be Nb 15 mm, as specified in IS : 554-1985 'Dimensions for pipe threads where pressure tight joints are required on the threads (third revision)' .

5.3 Wearing Rings and Other internal Components — Impellers and wearing rings shall be of corrosion and abrasion resistant material. Shaft sleeve, sealing cage, gland, gland nut and drain plug shall be of corrosion resistant material.

5.4 The impeller(s) shall be secured in an axial direction preventing contact with the casing under operating conditions.

5.5 Shaft(s)

Shaft(s) shall be of stainless steel or of carbon steel with corrosion resistant shaft sleeve(s) at stuffing box(es).

5.6 Sleeve Bearing(s)

5.6.1 The removable shell, if provided shall be accurately machined to achieve uniform cylindrical fits and shall be replaceable.

5.6.2 Sleeve bearings shall be oil lubricated.

5.6.3 The oil chamber shall be provided with 15 mm nominal pipe size drain to be threaded in accordance with IS : 554-1985 and fitted with a plug of corrosion resistant material.

5.6.4 Each bearing shall have a provision to fill the oil.

5.6.5 Water deflectors of corrosion resistant material shall be provided to seal the bearing

at its end facing the stuffing box.

5.7 Antifriction Bearings

5.7.1 Antifrict ion bearings shall be designed to have a minimum L 10 l ife (basic rating life) of 20 000 hours under maximum operating conditions.

5.7.2 Suitable means such as water deflector, oil seals, felt etc, shall be provided to limit the entrance of water and foreign matter into the antifriction bearings.

5.8 Shaft Sealing Arrangement — The shaft shall be provided with a sealing arrangement consisting of a stuffing box having adequate depth to accommodate required number of packings and a seal cage, if required. The gland shall exert a uniform pressure on the packings. The stuffing box at the suction side of the pump shall be water sealed.

5.9 Flexible Couplings — The pump shaft and drive shaft shall be connected with the help of suitable type of flexible coupling. Guard shall be provided to cover rotating flexible coupling.

6. Vertical Turbine Pumps

6.1 The rated speed of vertical turbine pumps shall not exceed 2 100 rpm.

6.2 Vertical turbine pump shall be designed to be driven by a vertical solid or hollow

shaft electric motor or an approved vertical hollow shaft right angle gear drive.

6.3 Discharge Heads

6.3.1 The discharge head may be of either the above (surface) ground type or the underground type.

6.3.2 The discharge head shall support the driver, the pump column assembly and the oil tube tension nut or stuffing box.

6.4 Pump Column

The column for a pump shall be furnished in sections not exceeding a nominal length of 3 m. It shall be of material and thickness specified in IS : 1710-1972 'Specification for vertical turbine pumps for clear, cold fresh water ( first revision )', and shall be connected by threaded sleeve type couplings or provided with other methods of connection.

6.5 Bowl Assemblies

Pump bowl shall be provided with bronze wearing ring of composition dissimilar to that of the impeller.

6.6 Impeller(s)

6.6.1 Impeller shall be of suitable corrosion resistant material.

6.6.2 Impeller(s) shall be statically and dynamically balanced and securely fastened to the impeller shaft. Impeller shall not contact the bowl under operating condition.

6.6.3 A suitable mechanism to adjust the proper axial position of the impeller(s) with respect to the bowl(s) shall be provided.

6.6.4 Water passages shall be designed to minimize the possibility of foreign materials being lodged in them.

6 .7 Impel ler Shafts

The impel ler shaf ts shall be of s tainless s tee l of Grade 04Cr13 of IS 6527:1972 'Specification for stainless steel wire rod' or material having equivalent strength, rigidity and resistance to corrosion.

6.8 Line Shafts

6.8.1 Line shafts of water lubricated type pumps shall be stainless steel (Grade 04Cr13 of IS 6527:1972 ) or of carbon steel with corrosion resistant shaft sleeves at bearings and at stuffing boxes.

6.8.2 The line shafts of oil lubricated type pumps shall be of carbon steel or materi al having equivalent strength and rigidity.

6.8.3 The computed; sheer stress in shafting shall not exceed 30 percent of the yield strength of 18 percent of the ultimate tensile strength, whichever is lower.

6.9 Line Shaft Couplings — The line shaft sections shall be connected by a threaded coupling or a muff or a sleeve coupling.

6.10 Line Shaft Bearings

6.10.1 Water lubricated line shaft bearings shall consist of cutless rubber moulded in corrosion resistant metal shells.

6.10.2 When the static water level exceeds 15.2 m below ground level oil lubricated pump shall be used.

Oil lubricated line shaft bearings for the enclosed line shaft shall be of corrosion resistant material.

6.11 Shaft Enclosing Tube — It shall be of adequate size and shall conform to the requirements specified in IS : 1710.

6.12 Oil Lubrication to Line Shaft Bearings — Aw automatic lubricator shall be installed for electric motor driven pumps and other type of lubricator for engine driven pumps. 7 PERFORMANCE OPERATION TEST, HYDROSTATIC STRENGTH TESTS,

MANUFACTURING AND PRODUCTION TESTS

7.1 Performance Operation Test

7.1.1 Performance characteristic shall be of the continuously rising type. Any pump may be

designed to meet more than one of the rated capacities by the use of suitable size of

impeller(s).

7.1.2 A pump shall have a rated capacity as specified in table 1 and shall have rated net

pressures of 2.8 kg/cm2 or higher. More than one capacity-pressure rating may be developed

for any pump. For each rated capacity, a pump shall develop no t less than the rated total head

as defined in 5.4.

7.1.3 A pump shall develop not less than 65 percent of rated total head when discharging at 1.5

times rated capacity.

7.1.4 In case of VT pumps, The maximum net pressure for a fire pump shall not excee d 140

percent of rated head. In case of the split case, multistage and end suction type pumps, the

shut-off head shall not exceed 120 percent of the rated head.

7.1.5 For the tests described in 7.5 – 7.9, the applicable Level of test tolerances as specif ied in

the IS 9137 shall be utilized. The operation test shall be permitted to be conducted at a speed

within 20 percent of the rated speed, and the performance curves for the exact rated speed

determined by means of affinity relationships.

7.1.6 The pump is to be subjected to an operation test at rated speed. Performance curves are to

be plotted showing the efficiency, brake-horsepower (kW), and total head developed at shutoff,

at rated capacity, at 150 percent of rated capacity, and at selected interm ediate capacities

between shutoff and maximum capacities exceeding 150 percent of rated capacity. A test is to

be conducted with a positive suction pressure sufficient to achieve the maximum brake -

horsepower (kW input) required by the pump.

7.1.7 A vertical-turbine pump is to be tested with the least amount of submergence and the

maximum bearing span intended for installation.

7.1.8 A split-case, end-suction, or in-line pump, or a vertical-turbine pump provided with a

suction vessel, is to be tested at rated capacity and 150 percent of rated capacity with a water

vacuum of 15 feet (4.57 m) at the pump suction flange (manometer location corrected to

datum) at sea level and reduced by 0.001 feet (0.3 mm) for each foot (0.3 m) of elevation

above sea level.

7.2 Hydrostatic Strength Tests

7.2.1 The pump casing and discharge castings of a split -case, end-suction, or in-line pump, the

pump bowls, and the discharge heads of a vertical turbine pump, shall withstand for 1 minute

without rupture a hydrostatic pressure of twice the maximum working pressure or 27 kg/cm2,

whichever is greater. For a vertical turbine pump, the bowls tested are to include discharge

bowls and intermediate bowls. Multistage pump shall be segmentally tested at the appropriate

suction pressure.

7.9.2 The suction vessel (if applicable) of a vertical -turbine pump shall withstand for 1 minute,

without rupture, a hydrostatic pressure of four times the rated maximum suction pressure or 27

kg/cm2, whichever is greater.

7.10 Manufacturing and Production Tests

7.10.1 To verify compliance with these requirements in production, the manufacturer shall

provide the necessary production control, inspection, and tests. The program shall include at

least the following:

a) Each pump is to be subjected to the tests specified in 7.5, and shall comply with

the applicable requirements in 7.1 – 7.4.

b) Each pump is to be tested hydrostatically for not less than 5 minutes. The test

pressure is to be not less than 1.5 times the maximum working pressure of the pump,

but in no case less than 17.2 kg/cm2. There shall be no rupture or leakage through the

castings at the test pressure. For a vertical turbine pump, both the discharge head and

pump’s bowls are to be tested.

c) The impeller(s) of each pump shall be balanced in accordance with the requirement in 4.8.

d) Records are to be maintained of all tests conducted.

7.11 Proof of design test

Split case pumps with the shaft in vertical position shall foe subjected to an additional endurance test for 24 hours at rated speed and rated capacity. During this test the bearings shall not exhibit wear as indicated by an increase in horse power required by the pump. The water shall not enter the lower bearings during running or standstill condition.

8 SELECTION OF D RIVE RATING

8.1 Motor-Driven Pumps

Motor shall not be overloaded' in the entire range of operation, that is. between zero capacity to

150 percent of the rated discharge.

8.2 Diesel Engine Driven Pumps

Engines, after correction for altitude and ambient temperature, shall have bare engine horse

power rating equivalent to the higher of the following two values.

a) 20 percent in excess of the maximum brake horse power required to drive the pump at its

duty point, or

b) The brake horse power required to drive the pump at 150 percent of its rated

discharge.

9 MARKING

9.1 Each pump shall be provided with a name plate of suitable size and made of corrosion resistant

metal, securely attached to the pump and visible after installation.

9.1.1 For all pumps, the nameplate shall include the following information:

a) Manufacturer's name or identifying mark,

b) Rated discharge,

c) Rated speed,

d) Model or type designation,

e) Serial number,

f) Rated head,

g) Net head at 150 percent of rated discharge,

h) Number of stages,

j) Maximum brake horse power required at rated speed at any discharge condition, and

k) Impeller diameter .

A directional arrow shall appear on each pump indicating the direction of rotation. 9.3

Standard Marking — Details available with the Bureau of Indian Standards.

EXPLANATORY NOTE

This standard contains basic requirements for products — split case and end suction

pumps and vertical turbine pumps. These requirements are based upon sound engineering

principles, research records of tests and field experience, and appreciation of the

problems of manufacture and installation.

ANNEX

FORMAT FOR SENDING COMMENTS ON BIS DOCUMENTS

(Please use A4 size sheet of paper only and type within fields indicated. Comments

on each clauses/sub-clauses/table/fig. etc be started on a fresh box. Information in

Column 4 should include reasons for the comments and suggestions for modified

wording of the clauses when the existing text is found not acceptable. Adherence to

this format facilitates Secretariat’s work)

Doc. No.: ______________ TITLE: ________________________________________

LAST DATE OF COMMENTS: ____________

NAME OF THE COMMENTATOR/ORGANIZATION: _________________________

Sl.

No.

Clause/Subclause/

para/table/fig.

No. commented

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