User Guide
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2.6.3.2.Division B
2) Potable water systems shall be designed, fabricated and installed in accordance
with good engineering practice, such as that described in the ASHRAE Handbooks
and ASPE Data Books. (See Appendix A.)
3) In one- and two-family dwelling units and manufactured homes, multi-purpose
systems that combine potable water systems and residential fire sprinkler systems shall
be designed, fabricated and installed in accordance with NFPA 13D, “Installation of
Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes.”
Hydraulic Load
1) Except as provided in Sentence (3), the hydraulic load of a fixture or device that
is listed in Table 2.6.3.2.A. shall be the number of fixture units given in the Table.
2) Except as provided in Sentences (1) and (3), the hydraulic load of a fixture that
is not listed in Table 2.6.3.2.A. is the number of fixture units listed in Table 2.6.3.2.D.
3
) Where fixtures are supplied with both hot and cold water, the hydraulic loads for
maximum separate demands shall be 75% of the hydraulic load of the fixture units given
in Tables 2.6.3.2.A. and 2.6.3.2.D. when using a detailed engineering design method.
4) The hydraulic load of urinals and water closets with direct flush valves shall be
the number of fixture units listed in Tables 2.
6.3.2.B. and 2.6.3.2.C. (See Appendix A.)
2.6.3.2.
Table 2.6.3.2.A.
Sizing of Water Distribution Systems
(1) (2)
Forming Part of Sentences 2.6.3.2.(1), (2) and (3), and 2.6.3.4.(2), (3) and (5)
Private Use Hydraulic Load,
fixture units
Public Use Hydraulic Load,
fixture units
Fixture or Device
Minimum Size
of Supply Pipe,
inches
Cold Hot Total Cold Hot Total
Bathroom group with6LPF flush tank
(3)
Bathroom group with greater than 6 LPF
flush tank
(3)
Bathroom group with more than 3 fixtures
Bathtub with or without shower head
Bathtub with ¾ inch spout
Bedpan washer
Bidet
Cothese washer 3.5 kg
Clothes washer 6.8 kg
Cothes washer, commercial
(5)
Dental lavatory
Dental unit, cuspidor
Dishwasher, commercial
(5)
Dishwasher, domestic
Drinking fountain or water cooler
Hose bibb
Hose bibb
Hose bibb, combination hot and cold
Lavatory, 8.3 LPM or less
Lavatory, greater than 8.3 LPM
Sink, bar
Sink, clinic service faucet
Sink, clinic service with direct flush valve
Sink, kitchen commercial, per faucet
Sink, kitchen domestic, 8.3 LPM
n/a
n/a
-
½
¾
1
3
⁄
8
½
½
-
3
⁄
8
3
⁄
8
-
3
⁄
8
3
⁄
8
½
¾
½
3
⁄
8
3
⁄
8
3
⁄
8
½
1
½
3
⁄
8
2.7
4
-
1
7.5
-
1.5
1
-
-
-
-
-
-
-
2.5
3
1.9
0.5
0.75
0.75
-
-
-
1
1.5
3
-
1
7.5
-
1.5
1
-
-
-
-
-
1.4
-
-
-
1.9
0.5
0.75
0.75
-
-
-
1
3.6
6
(4)
1.4
10
-
2
1.4
-
-
-
-
-
1.4
-
2.5
3
2.5
0.7
1
1
-
-
-
1.4
-
-
-
3
7.5
7.5
-
2.25
3
-
1.5
1
-
-
0.25
2.5
6
1.9
1.5
1.5
1.5
2.25
6
3
1
-
-
-
3
7.5
7.5
-
2.25
3
-
1.5
-
-
-
-
-
-
1.9
1.5
1.5
1.5
2.25
-
3
1
-
-
-
4
10
10
-
3
4
-
2
1
-
-
0.25
2.5
6
2.5
2
2
2
3
6
4
1.4
National Plumbing Code of Canada 2010 Division B 2-49
NPCC table 2.6.3.2
Reproduced with the permission of the National Research Council of Canada, copyright holder.