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है”ह”ह

IS 4073 (1967): Specification for fish weights [WRD 1:Hydrometry]

GrZ

IS: 4073 ·1967( Reaffirmed 2001 )

Indian StandardSPECIFICATION FOR

FISH WEIGHTS

( Second Reprint JANUARY 1998 )

UDC 532.57 : 681.12

C Copyright 1967

BUREAU OF INDIAN STANDARDSMANAKBHAVAN.~BAHADURSHAHZAFARMARG

NEW DELHI 110002

June 1967

IS : 4073· 1967

Indian StandardSPECIFICATION FOR

FISH WEIGHTSFluid Flow Measurement Sectional Committee, BDC 17

Chairman

DR A. N. KHOSLA

Vice·Chairman

SURI N. D. GULHATI

Representing

In personal capacity ( Governor of Orissa. Bhubanestoar )

In personal capacity ( 140 Sunder Nagar, New Delhi)

Andhra Pradesh Engineering Research Laboratories,Hyderabad

River Research Institute, Government of West BengalDIRECTORDEPUTY DIRECTOR (Alternate)

DIRECTOR

SHRI K. K. FRAMJI

Land Reclamation, Irrigation and Power ResearchInstitute, Government of Punjab

In personal capacity [ReTldel, Palmer & 'Iruton( India) Ltd, New Delhi]

SHRI N. K. GHOSH National Instruments Private Ltd, CalcuttaSHRI C. V. GOLE Central Water & Power Research Station, Poona

SHRI S. V. CHITALE ( Alternate)PR(),J';;Jlj'. S. GOVINDA RAO Indian Institute of Science, BangaloreSHRI S. N. GUPTA Irrigation Department, Government of Uttar PradeshSHRI jATINDRA SINGH Institution of Engineers ( India), CalcuttaDR D. V. jOGLEKAR Central Board of Irrigation & PowerJOINT DIRECTOR ( B & F) Railway Board, Ministry of Railways

DEPUTY DIRECTOR ( B & F) ( Alternate )SHRI KANWAR SAIN In personal capacity ( C/o ECAFE, Bangkok)SBRI K. N. KATHPALIA In personal capacity (38 E. C. Road, Dehra Dun)SHRI A. N. KRISHNASWAMY All India Instrument Manufacturers' and Dealers'

Association, BombayMEMBER (DESIGN & RESEARCH) Central Water & Power Commission

DR I. C. Dos M. PAIS CUDDOU (Alternate)

Members

DR B. K. AGARWALA National Physical Laboratory ( CSIR), New DelhiSHRI P. R. AHUJA Ministry of Irrigation & Power

SHRI V. N. NAGARAJA ( Alternate)SHRI BALESHWAR NATH Committee on Plan Projects, Planning CommissionSHRI S. BANERJEE India Meteorological DepartmentDR BHARAT SINGH University of Roorkee, RoorkeeSHRI K. L. BHATIA Central Board of' Irrigation & PowerSHRI D. R. BHISE Bombay Municipal Corporation, Bombay

SHRI V. D. DESAI ( Alternate)CHIEll' ENGINEER, IRRIGATION Public Works Department, Government of Mvsore

PROJECTSSHRI D. DODDlAH ( Alternate)

DIRECTOR

( Continued 0'1 page 2 )

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MAlHi

NEW DELHI 110002

IS : 4073 • 1967

( Continued from page I )

MembersSUPERINTENDING ENGINEER

( DESIGiI'S )EXEOUTIVE ENGINEER (RE­

SEAROH) (Alternate)SHRI G. VENKATESULUSHRI G. K. VIJ

SHRI R. C. SHENOY ( Altemau iSaRI R. NAGARAJAN,

Director ( CIV Engg )

R,presentingIrrigation Department, Government of Madras

Roads Wing, Ministry of TransportCentral Water & Power Commission

Director General, lSI (Ex-officio Memb,r )

&cretarySHRI K. RAaHAvENDRAN

Deputy Director (Civ Engg), lSI

Fluid Flow Measuring Instruments Subcommittee, BDC 17: 4

Conve"".SHRI K. K. FRAllfJI In personal capacity [Randel, Palmer & Tritton

(India) Ltd, New Delhi]

Gun &: Carriage Factory ( OGOF ), JabalpurAssociatt'd Instrument Manufacturers ( India)

Private Ltd, New Delhi

( RE·

MemblTsDR B. K. AGARWALA National Physical Laboratory (CSIR), New Delhi

SHRI M. K. DAB GUPTA ( Alternat« )SaRI P. R. AHUJA Ministry of Irrigation & Power

SHRI K. V. RAMA RAO ( Alternate)DR I. C. Dos M. PAIS CUDDOU Central Water & Power Commission

SHRI N. C. RAWAL ( Altimate)DIRECTOR Central Waler & Power Research Station, Poona

SHRI P. K. KULKARNI (Alternal,)DIREOTOR Land Reclamation, Irrigation & Power Research

Institute, Government of PunjabGanga Discliarge Circle, Ministry of Irrigation &

PowerIndian Institute of Science, BangaloreIrrigation Department, Government of Uttar PradeshAlI India Instrument Manufacturers' &: Dealers'

Association, BombayRiver Research Institute,Government of West Ben..lThe Andhra Scientific Co Ltd, MasulipatamAryan Metal Works, New DelhiNational Instruments Private Ltd, CalcuttaCentral Scientific Instruments Organization (CSIR),

ChandigarhENGHiEER Irrigation Department Government of Madras

SHRI O. P. GAllO

PRO)' N. S. GOVINDA RAOSHRI S. N. GUPTASaRI A. N. KRISHNASWAMY

SUPERINTENDING(DESIGNS)

EXECUTIVE ENGINEERSEARCH) (AltlTnate)

SHRI B. S. TIWARISHRI H. C. VERMA

SHRI B. MAITRASHRI Y. S. NARAYANASHRI RAJINDER PAULSHRI D. C. RoySHRI M. P. SOOD

SDKI O. NIRODY ( Altemat' )

( Continued on/Jag, 8 )

2

IS I 4073 -1967

Indian StandardSPECIFICATION FOR

FISH WEIGHTS

o. FOR E W 0 R D

0,1 This Indian Standard was adopted by the Indian Standards Institutionon 30 March 1967, afft.er the draft finalized by the Fluid Flow Measure­ment Sectional Committee had been approved by the Civil EngineeringDivision Council.

0.2 Rigid rod suspension is considered best to ensure verticality for themeasurement of depth and for suspending current meters and sedimentsamplers. But in large depths and high velocities of water it becomesnecessary to use a log line to measure depths and to lower current metersor sediment samplers with suspension cables. Sounding weights are addedto the log line or suspension cables to keep them reasonably vertical. Thehigher the velocity and the greater the water depth, the greater will bethe drag caused by the instrument, and the heavier the weights required.

0.3 The shape and dimensions of the weights have an appreciable effect onthe normal flow conditions in the channel and, therefore, on the accuracyof flow measurement. As one standard weight cannot be used in allcircumstances and too wide a variety of weights is obviously undesirable,

·4fthis standard sets out a limited number of typical sizes.

0•• For the purpose of decidingwhether a particular requirement of thisstandard is complied with, the fi~f value,observed or calculated, express­ing the result of a test, shall be rounded offin accordance with IS: 2-1960·.The number of significant places retained in the rounded off value shouldbe the same as that of the specified value in this standard.

1. SCOPE1.1 This standard covers the shape, and dimensions of and the materials tobe used for the fish (lead) weights. Typical examples are given inAppendix A,

2. TERMINOLOGY2.1 For the purpose of this standard, the definitions given III

IS: 119l-l959t shall apply.

•Rules for rounding off'numerical values ( rlfJis,d ).tGl08llary of terms and symbols used in connection with the measurement of liquid

flow with a free surface ( "rut" r,vision ).

3

IS: 4073 -1967

3. FUNCTIONAL REQUIREMENTS

3.1 The weights shall comply with the following requirements.

3.1.1 The fish weights are required to provide protection to the currentmeter when it is being lowered in water. Therefore, its size should besuch as to shield the current meter cups and body.

3.1.2 They shall be streamlined to offer the least obstruction to water.

3.1.3 They shall be provided with Vanes for orienting them correctlyin direction of flow.

3.1.4 The specific gravity of the material usedfor the fish weights shouldbe as high as possible, preferably not less than 7'5.

4. GENERAL4.1 Normally.a 10 kg fish weight is adequate for use in shallow depths andlow velocities when a hand line is used. For larger depths and velocitieswhere power operated gauging reels are used, heavier weights specifiedbelow depending upon depth, velocity and type of cable, are used to makethe log line or suspension cable hang in as nearly a vertical position aspossible. There is no general rule for the choice of the weight to be addedbut for approximate guidance the following rule which may not be correctin all cases is suggested:

. . . Weight in kilogramsVelocity ~n metres per second x Depth m metres = 5

4.2 Normally, a cable of 10 mm diameter is convenient for use with handline and a 2'5 mm diameter cable gauging reel for high velocitymeasurement.

5. SIZES

5.1 Weight-The fish weights shall be of 10, 15, 25, 35 and 50 kgweight. The variations in actual weight shall not be more than± 2 percent.

6. MATERIAL6.1 The material should be heavy (sp gr greater than 7'5), non-rusting andnon-corrodible, preferably lead, nearest to Grade Pb 99'8 of IS: 27-1956*.Cast iron with proper painting may also be used.

7. MARKING7.1 The fish weights shall be marked with the following details:

a) Its actual weight,b) Name of manufacturer, andc) Overall dimensions.

*Specification for pig lead ( revised).

4

IS :4073 - 1967

7.1.1 These may also be marked with Standard mark.

7.1.2 The use of the Standard Mark is govered by the provisions of theBureau of Indian Standards Act, 1986 and the Rules and Regulations madethereunder. The details of conditions under which the licence for the use ofStandard Mark may be granted to manufacturers or producers may be obtainedfrom the Bureau of Indian Standards.

APPENDIX A

(Clause 1.1 )

TYPICAL EXAMPLES OF FISH WEIGHTS

A-I. TYPE I

A-I.I these weights should be streamlined. to offer least resistance towater and should have vanes attached to the tailend for orienting theattached instrument correctly in the direction of flow. A typical sketchof the. weight is shown in Fig. I. The body of the weight has a circularcross-section with a smooth and uniformly tapering nose so as to providestreamline conditions. I ts tail is made to converge to form a smallercylinder in which four tail fins or vanes are mounted as shown in Fig. 1.

The body of the weight should have a narrow vertical slot for thesuspension rod which is secured to the suspension weight by a bolt througha threaded horizontal hole in the body of the weight and suspension rod.The vertical slot should be made wider at the top so as to allow lateralmovement of the suspension rod from the vertical axis, to prevent theweight from striking any part of the current meter.

A-2. TYPE 2 (COLUMBUS TYPE)

A-2.1 Figure 2 shows a typical sketch of this type. These weights are alsostreamlined and have an ellipsoidal shape at the nose, with a tapering bodyin the rear, but with larger sized tail vanes. The construction should per­mit the removal of the vanes for straightening or replacement. The shapeof the slot for the hanger should permit the hanger to tip forward by 15°from the vertical. All exposed sharp corners of the fins should berounded off.

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IS :4073 -1967

( Contimudfrom page 2 )

Panel for the Preparation of Draft Standards on Fluid Flow MeasuringInstruments, BDe 17: 4/P-l

ConvenerSHIn O. P. GARG

MembersSHBI A. N. MALHo'fRA

SHBI N. C. RAWAL

ReprlsentingGanga Discharge Circle, Ministry of Irrigation &

Power

Ganga Discharge Circle, Ministry of Irrigation &Power

Central Water & Power Commission

8

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