Dingman Township
                           Pike County, PA        

 


                       

 

Dingman Township Building Aids

Charts and other information designed to assist the builder in preparing proper plans to fulfill the requirements of the International Construction Code and the Dingman Township Building Ordinance.

Worksheet for Sizing Water Supply and Distribution Pipes

[For Quick Link to Tables, click on link below]

Instructions / Worksheet

Water Sizing Table based on Table 2903.7 of the IRC

W.S.F.U. based on Table 2903.6 of IRC

Required Capacities at Fixture Supply Outlets

Total W.S.F.U. Fill in Table based on tables 1,2,3 and Tables 2903.1, 2903.6 and 2903.7 of the IRC

 

 

Instructions / Worksheet

 

This worksheet is to aid in the sizing of the water supply and distribution system for RESIDENTIAL applications.  This guide has been designed utilizing the text and tables found in the 2003 International Residential Code.  This guide is intended to be used in conjunction with the IRC or accepted engineering practices.  Therefore Dingman Township does not assume any responsibility for errors or omissions in the design of the water supply system.
STEP ONE:

1.     Fill in table #4 using table #2 and based on the proposed design

2.     Enter total W.S.F.U. demand from table #4  
3.     Enter the developed pipe length to the most remote fitting  
4.     Multiply the developed length by 1.2 for pressure loss from fittings  
5.     Minimum daily static pressure at the source (40 psi minimum)

40

6.     Deduct pressure losses for filters, regulators, etc.  
7.     Add (or subtract) 1/2 lb. pressure per foot of rise (or fall)  
8.     Enter required minimum pressure needed.  
 
STEP TWO:

9.     Find minimum pressure range in table #1

10.   Find maximum developed length in chart row
11.   Find total number of total W.S.F.U. in that column
12.   Slide over to left hand columns to mind min. supply and distribution pipe size
 

Supply

Distribution
 

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Water Sizing Table based on Table 2903.7 of the IRC

Table #1

 

Pressure Range 40 - 49 psi

Service Pipe Distribution Pipe Maximum Developed Length (feet) a
40' 60' 80' 100' 150' 200' 250'
3/4" 1/2" b 3 2.5 2 1.5 1.5 1 1
3/4" 3/4" 9.5 9.5 8.5 7 5.5 4.5 3.5
3/4" 1 32 32 32 26 18 13.5 10.5
1" 1 32 32 32 32 21 15 11.5
1" 1 1/4" 80 80 80 80 65 52 42

Pressure Range 50 - 60 psi

3/4 1/2" b 3 3 2.5 2 1.5 1 1
3/4 3/4" 9.5 9.5 9.5 8.5 6.5 5 4.5
3/4 1" 32 32 32 32 25 18.5 14.5
1 1" 32 32 32 32 30 22 16.5
1 1 1/4" 80 80 80 80 80 68 57

Pressure Range over 60 psi

3/4" 1/2" b 3 3 3 2.5 2 1.5 1.5
3/4" 3/4" 9.5 9.5 9.5 9.5 7.5 6 5
3/4" 1" 32 32 32 32 32 24 19.5
1" 1" 32 32 32 32 32 28 22
1" 1 1/4" 80 80 80 80 80 80 69
 
    Notes:
                  a.     First multiply actual length to most remote fixture by 1.2 to compensate for loss at fittings

                  b.     Minimum building supply is 3/4 inch

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W.S.F.U. Based on Table 2903.6 of the IRC

Table #2

 

Type of Fixture or Group of Fixtures

Water-Supply Fixture-Unit value (w.s.f.u.)

HOT COLD COMBINED
Full Bath group with tub or shower  b 1.5 2.7 3.6
Kitchen Group dishwshr, sink, with or w/out gar disp. 1.9 1.0 2.5
Laundry Group 1.8 1.8 2.5
Bathtub 1.0 1.0 1.4
Clothes washer 1.0 1.0 1.4
Dishwasher 1.4 --- 1.4
1/2 Bath (water closet and lavatory) 0.5 2.5 2.6
Hose bibb (silcock) a --- 2.5 2.5
Kitchen sink 1.0 1.0 1.4
Laundry tub 1.0 1.0 1.4
Lavatory 0.5 0.5 0.7
Shower stall 1.0 1.0 1.4
Water closet --- 2.2 2.2
Notes:

        a.  The fixture unit value 2.5 assumes a flow demands of 2.5 gpm, such as for an individual lawn sprinkler    device.  If a hose bib/silcock will be required to furnish a greater flow rate the equivalent fixture-unit may be obtained from Table P2903.6 or Table 2903.7.

        b.   Includes water closet, lavatory, and tub (with or without shower) or shower stall.

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Required Capacities at Fixture Supply Outlets

Table #3

 

FIXTURE OUTLET GPM PSI
Bathtub 4 8
Bidet 2 4
Dishwasher 2.75 8
Laundry tub 4 8
Lavatory 2 8
Shower 3 8
Shower (temperature controlled) 3 20
Hose bibb 5 8
Kitchen sink 2.5 8
Water closet (tank type) 3 8
Water closet (flushometer) 1.6 15
Water closet (one piece) 6 20
 

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Total W.S.F.U. Fill-in Table Based on Tables 1,2, & 3 and Tables 2903.1, 2903.6, and 2903.7 of the IRC

Table #4

 

Fixture Number Combined Units Total WSFU
Bathtub      
Washer      
Dishwasher      
Hose bibb      
Kitchen sink      
Lavatory      
Laundry tub      
Shower stall      
Water closet      
Laundry Group      
Kitchen Group      
Half bath group      
Full bath group      
 

TOTAL =

 
 

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