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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
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Instructions / Worksheet
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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. |
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STEP ONE:
1. Fill in
table
#4
using table #2
and based on the proposed design |
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2. Enter total W.S.F.U. demand from
table #4 |
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3. Enter the developed pipe length to
the most remote fitting |
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4. Multiply the developed length by
1.2 for pressure loss from fittings |
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5. Minimum daily static pressure at
the source (40 psi minimum) |
40 |
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6. Deduct pressure losses for
filters, regulators, etc. |
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7. Add (or subtract) 1/2 lb. pressure
per foot of rise (or fall) |
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8. Enter required minimum pressure
needed. |
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STEP
TWO:
9. Find minimum pressure range in
table
#1 |
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10. Find maximum developed length in
chart row |
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11. Find total number of total W.S.F.U.
in that column |
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12. Slide over to left hand columns to
mind min. supply and distribution pipe size |
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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 |
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1" |
1 |
32 |
32 |
32 |
32 |
21 |
15 |
11.5 |
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1" |
1 1/4" |
80 |
80 |
80 |
80 |
65 |
52 |
42 |
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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 |
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3/4 |
1" |
32 |
32 |
32 |
32 |
25 |
18.5 |
14.5 |
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1 |
1" |
32 |
32 |
32 |
32 |
30 |
22 |
16.5 |
|
1 |
1 1/4" |
80 |
80 |
80 |
80 |
80 |
68 |
57 |
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Pressure Range over 60
psi |
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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 |
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3/4" |
1" |
32 |
32 |
32 |
32 |
32 |
24 |
19.5 |
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1" |
1" |
32 |
32 |
32 |
32 |
32 |
28 |
22 |
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1" |
1 1/4" |
80 |
80 |
80 |
80 |
80 |
80 |
69 |
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Notes: |
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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
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|
Type of
Fixture or Group of Fixtures |
Water-Supply Fixture-Unit value (w.s.f.u.) |
|
HOT |
COLD |
COMBINED |
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Full Bath
group with tub or shower b |
1.5 |
2.7 |
3.6 |
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Kitchen Group
dishwshr, sink, with or w/out gar disp. |
1.9 |
1.0 |
2.5 |
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Laundry Group |
1.8 |
1.8 |
2.5 |
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Bathtub |
1.0 |
1.0 |
1.4 |
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Clothes
washer |
1.0 |
1.0 |
1.4 |
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Dishwasher |
1.4 |
--- |
1.4 |
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1/2 Bath
(water closet and lavatory) |
0.5 |
2.5 |
2.6 |
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Hose bibb
(silcock) a |
--- |
2.5 |
2.5 |
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Kitchen sink |
1.0 |
1.0 |
1.4 |
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Laundry tub |
1.0 |
1.0 |
1.4 |
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Lavatory |
0.5 |
0.5 |
0.7 |
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Shower stall |
1.0 |
1.0 |
1.4 |
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Water closet |
--- |
2.2 |
2.2 |
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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. |
Back to Top
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Required
Capacities at Fixture Supply Outlets
Table #3
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|
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
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|
Fixture |
Number |
Combined Units |
Total WSFU |
| Bathtub |
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| Washer |
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| Dishwasher |
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| Hose bibb |
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| Kitchen sink |
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| Lavatory |
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| Laundry tub |
|
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| Shower stall |
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| Water closet |
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| Laundry Group |
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| Kitchen Group |
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| Half bath group |
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| Full bath group |
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TOTAL = |
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