design & application of water piping system.pdf

7/30/2019 Design & Application of Water Piping System.pdf

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Design and Application of Water Piping System

Cold water supply

Hot water supply

Drinking water


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Standard and Code reference

of Water Piping System

E.I.T. Standard 1004-16

(Standard for piping installation in building)

E.I.T. Standard 3004-40

(Standard for piping in building)


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Standard and Code Reference on

Water Piping System

National plumbing codes

National fire protection association code (NFPA)


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Criteria to Design of Copper Tube in

Hot water supply system

Estimating Hot-Water Demand

Storage type heaters

Instantaneous type heaters


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Estimating the Demand in Hot-Water System

See Table 1


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Table 1 Probable Hot-Water Demand and Use for VariousTypes of Building Occupancies


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Estimating of Hot-Water Requirements with Storage

Type Water Heaters

See Table 2


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Table 2 Estimates of Hot-Water Requirements in VariousTypes of Buildings with Storage-Type Water Heaters


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Hot water supply systemProcedure for Estimating

Step 1 Tabulate the number of fixtures

Step 2 Multiply the number of fixtures by demandfigure

Step 3 Summarize the total demand

Step 4 Obtain the Hourly Heating Capacity bymultiplying the figure in step 3 by the demand

factor.


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Hot water supply systemProcedure for Estimating

Step 5 Obtain the Required Capacity of The Storage

Tank by multiplying the figure in step 4 by thestorage capacity factor

Step 6 Obtain the Total Capacity of The Storage Tank

by dividing the figure in step 5 by 0.6-0.8


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Estimate of Hot Water Requirements with

Instantaneous and Semi-Instantaneous Type Water

Heater See table 3


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Table 3 Probable Hot-Water Demand in Terms of Number ofFixture Units for Various Types of Fixtures in Buildings

For use with semi-instantaneous heaters, calculated at a finaltemperature of 140oF (60oC)


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Hot water supply systemSizing of Hot Water piping System

Determine the total demand in water supply

- see Demand load fixture in Table 4

- see Demand water supply in Table 5


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Table 4 Demand Load of Fixtures


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Table 5 Table for Estimating the Demand in a Water Supply System


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WATER SUPPLY SERVICES

FIG.1 (a) The estimated demand in gallons per minute or liters per secondcorresponding toe a given load expressed in fixture units. (b) A detail of Fig.1for small demand.


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Minimum Pressure Required

- 8 psi for normal waters supply outlet

- 15 psi for floor-outlet-type water closets and

urinal

- 25 psi for wall-hung siphan-jet or blowout-typewater closets


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Friction loss in equipment

Equivalent length of piping

- Fittings and Valves

+ 50% for copper tube system

+ 80% for standard threaded-pipe system


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Limitation of Velocity

- 4 ft/s (1.2 m/s) for branch piping

- 8 ft/s (2.4 m/s) for main piping


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Table 6 Sizing Table Based on Velocity Limitation-U.S. Customary UnitsCopper water tube, type K


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Table 7 Sizing Table Based on Velocity Limitation-U.S. Customary UnitsCopper water tube, type L


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Sizing of Hot Water piping System

Pipe Insulation

- see Table 8


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Hot water circulating system

- Total length of pipe between hot water source andthe fixture is more than 100 ft.


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Hot water circulating rate

- 2 gpm. For 2 - 2 1/2 inch diameters of supplypipe

- 3 gpm. For 3 inch diameters and larger of supplypipe


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Drinking water system

Sizing of Drinking Water piping System

Determine the maximum drinking water demand

- 5 gph for drinking fountain

- 1 gph for every 20 people

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