OBC 2006 › Division B

7.6.3.1.

Version 1 — in force 1 January 2010

In force · amended

Verified · covered Verified against the 2010-01-01–2010-03-31 consolidation, whose range covers the query date. How to read this

In force · amended

Verified · covered Verified against the 2010-01-01–2010-03-31 consolidation, whose range covers the query date. How to read this

Provenance

OBC 1997 · continues from 7.6.3.1. — Pro

OBC 1997 · merged from 7.6.3.2. — Pro

Base · O. Reg. 350/06 · ext v0 →

O. Reg. 503/09, cl. 113 · ext ← current

In force 2010-01-01

OBC 2012 · split into 7.6.3.1. — Pro

OBC 2012 · split into 7.6.3.4. — Pro

7.6.3.1. — Design

(1) Except as permitted in Sentences (2) and (3), the size of every pipe in a water distribution system that supplies water to a fixture or device and the flow pressures at the supply openings shall be designed to provide peak demand flow in conformance to Table 7.6.3.1.

(2) A tail piece or connector not more than 750 mm long and not less than ¼ in. inside diameter may be used to supply water to a fixture or device.

(3) A water distribution system that serves not more than a single dwelling unit does not need to conform to Column 3 of Table 7.6.3.1.

(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, shall be less than ¾ in. size.

(5) Every pipe that supplies a fixture shall have a capacity that will produce a flow in the fixture that will flush the fixture and keep it in a sanitary condition.

Text · e-Laws consolidated snapshot

Table 7.6.3.1. Pipe Sizing for Water Supply to Fixture/Device Forming Part of Sentences 7.6.3.1.(1) and (3)


Column 1	Column 2	Column 3	Column 4	Column 5
Fixture or Device	Minimum Size of Supply Pipe, in.	Minimum Flow Pressure⁽¹⁾kPa (gauge)	Hydraulic Load, fixture units
			Private Use	Public Use
Bathroom group
(a) with flush tank	NA	NA	6	-
(b) with direct flush valve	NA	NA	8	-
Bath tub (with or without shower)	½	50	2	4
Clothes washer	½	100	3	-
Cup Sink	½	50	-	4
Dishwasher, domestic	½	100	3	-
Drinking fountain	3/8	100	-	1
Hose bib or wall hydrant	½	100	⁽²⁾	⁽²⁾
Laundry tray: 1, 2 or 3 compartments	½	100	2	4
Lavatory	3/8	50	1	2
Shower, single head	½	50	2	4
Sink
(a) kitchen, domestic	½	50	2	-
(b) kitchen, commercial	½	50	-	4
(c) service, slop	½	50	-	3
(d) service with direct flush valve	¾	100	-	5
Urinal
(a) with flush tank	½	50	-	3
(b) with direct flush valve	¾	100	-	5
(c) with self closing metering valve	½	-	-	-
Water closet
(a) with flush tank	3/8	50	3	5
(b) with direct flush valve	1	100	6	10

Notes to Table 7.6.3.1.:

⁽¹⁾Measured immediately upstream of faucet or supply valve.

⁽²⁾A continuous load of 0.38 L/s.

B 7.6.3.2. v0