User Guide

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2.6.3.2.Division B
Static Pressure
1) Where the static pressure at any fixture may exceed 550 kPa, a pressure-reducing
valve shall be installed to limit the maximum static pressure at the fixture to 550 kPa.
Size
1) Every water service pipe shall be sized according to the peak demand flow but
shall not be less than ¾ inch size.
2) Except as provided in Sentence (3), the size of a supply pipe that serves a fixture
shall conform to Table 2.6.3.2.A.
3 ) For fixtures listed in Table 2.6.3.2.A. that have a permitted supply pipe size of
3
⁄
8
inch, a connector not more than 750mm long and not less than 6.3mm inside
diameter may be used to supply water to the fixture.
4) No water system between the point of connection with the water service pipe or
the water meter and the first branch that supplies a water heater that serves more
than one fixture shall be sized less than ¾ inch.
5) Where both hot and cold water is supplied to fixtures in residential buildings
containing one or two dwelling units or row houses with separate water service pipes,
the water system may be sized in accordance with Table 2.6.3.4., where
a) the hydraulic loads for maximum separate demands on water distribution system
piping are not less than 100% of the total hydraulic load of the fixture units given
in Tables 2.6.3.2.A., 2.6.3.2.B., 2.6.3.2.C. or 2.6.3.2.D. for private use,
b) the minimum water pressure at the entry to the building is 200 kPa, and
c) the total maximum length of water system is 90 m.
2.6.3.3.
2.6.3.4.
National Plumbing Code of Canada 2010 Division B 2-49
Table 2.6.3.2.C.
Sizing of Water Distribution Systems for Water Closets with Direct Flush Valves
Forming Part of Sentences 2.6.3.2.(4) and 2.6.3.4.(5)
Fixture Units in Accumulative Values
(1)
Number of Valves
Individual Fixture Unit Assigned in
Decreasing Values
1
2
3
4
5 or more
40
30
20
15
10 for each public use
and
6 for each private use
40
70
90
105
115, plus 10 for each public use
additional fixture excess of 5
and
111, plus 6 for each private use
additional fixture in excess of 5
Table 2.6.3.2.D.
Hydraulic Loads of Fixtures Not Listed in Table 2.6.3.2.A.
Forming Part of Sentences 2.6.3.2.(2) and 2.6.3.4.(5)
Public use
Size of Supply Pipe, Inches
Hydraulic Load, fixture units
Private use
3
⁄
8
½
¾
1
1
2
3
6
2
4
6
10
Notes to Table 2.6.3.2.C.:
(1) The accumulative fixture unit values are the total values to be used in conjuncion with Table 2.6.3.2.A.
NPCC table 2.6.3.2
Reproduced with the permission of the National Research Council of Canada, copyright holder.