Division B
Acceptable Solutions
Part 2 — Plumbing Systems
Section 2.6. Potable Water Systems
2.6.1. Arrangement of Piping
2.6.1.1. Design
1) 
Every fixture supplied with separate hot and cold water controls shall have the hot water control on the
left and the cold on the right.
Every fixture supplied with separate hot and cold water controls shall have the hot water control on the
left and the cold on the right.
2) In a hot water distribution system of a developed length of more than 30 m or supplying more than 4 storeys, the water temperature shall be maintained by
In a hot water distribution system of a developed length of more than 30 m or supplying more than 4 storeys, the water temperature shall be maintained bya) recirculation, or
b) a self-regulating heat tracing system.
2.6.1.2. Drainage
1) A water distribution system shall be installed so that the system can be drained or blown out with air.
A water distribution system shall be installed so that the system can be drained or blown out with air.
2.6.1.3. Shut-off Valves
1) Every water service pipe shall be provided with an accessible shut-off valve located as close as
possible to where the water service pipe enters the building.
Every water service pipe shall be provided with an accessible shut-off valve located as close as
possible to where the water service pipe enters the building. 2) Every pipe that conveys water from a gravity water tank or from a private water supply system shall be fitted with a shut-off valve at the source of supply.
Every pipe that conveys water from a gravity water tank or from a private water supply system shall be fitted with a shut-off valve at the source of supply.
3) Except for risers that serve only one dwelling unit, every riser shall be provided with a shut-off valve located at the source of supply.
Except for risers that serve only one dwelling unit, every riser shall be provided with a shut-off valve located at the source of supply.
4) Every water closet shall be provided with a shut-off valve on its water supply pipe.
Every water closet shall be provided with a shut-off valve on its water supply pipe.
5) In buildings of residential occupancy that contain more than one dwelling unit, a shut-off valve shall be installed where the water supply enters each dwelling unit, so that, when the water supply to one suite is shut off, the water supply to the remainder of the building is not interrupted. (See Appendix A.)
In buildings of residential occupancy that contain more than one dwelling unit, a shut-off valve shall be installed where the water supply enters each dwelling unit, so that, when the water supply to one suite is shut off, the water supply to the remainder of the building is not interrupted. (See Appendix A.)6) In buildings of other than residential occupancy, shut-off valves shall be provided on the water supply to
In buildings of other than residential occupancy, shut-off valves shall be provided on the water supply toa) every fixture, or
b) any group of fixtures in the same room, except as provided in Sentence (4).
7) Every pipe that supplies water to a hot water tank shall be provided with a shut-off valve located close to the tank.
Every pipe that supplies water to a hot water tank shall be provided with a shut-off valve located close to the tank.
2.6.1.4. Protection for Exterior Water Supply
1) Every pipe that passes through an exterior wall to supply water to the exterior of the building shall be provided with
Every pipe that passes through an exterior wall to supply water to the exterior of the building shall be provided witha) a frost-proof hydrant, or
b) a stop-and-waste cock located inside the building and close to the wall.
2.6.1.5. Check Valves
1) A check valve shall be installed at the building end of a water service pipe where the pipe is made of plastic that is suitable for cold water use only.
A check valve shall be installed at the building end of a water service pipe where the pipe is made of plastic that is suitable for cold water use only.
2.6.1.6. Flushing Devices
1) Every flushing device that serves a water closet or one or more urinals shall have sufficient capacity and be adjusted to deliver
at each operation a volume of water that will thoroughly flush the fixture or fixtures that it serves.
Every flushing device that serves a water closet or one or more urinals shall have sufficient capacity and be adjusted to deliver
at each operation a volume of water that will thoroughly flush the fixture or fixtures that it serves.
2) Where a manually operated flushing device is installed it shall serve only one fixture.
Where a manually operated flushing device is installed it shall serve only one fixture. 2.6.1.7. Relief Valves
1) In addition to the requirements in Sentence (2), every hot water tank of a storage-type service water heater shall be equipped with a pressure-relief
valve
In addition to the requirements in Sentence (2), every hot water tank of a storage-type service water heater shall be equipped with a pressure-relief
valvea) designed to open when the water pressure in the tank reaches
the rated working pressure of the tank, and
b) so located that the pressure in the tank shall not exceed the
pressure at the relief valve by more than 35 kPa under
any condition of flow within the distribution system.
2) Every hot water tank of a storage-type service water heater shall be equipped with a temperature-relief
valve with a temperature-sensing element
Every hot water tank of a storage-type service water heater shall be equipped with a temperature-relief
valve with a temperature-sensing elementa) located within the top 150 mm of the tank, and
b) designed to open and discharge sufficient water from the tank
to keep the temperature of the water in the tank from exceeding 99°C under all operating conditions.
3) A pressure-relief valve and temperature-relief valve may be combined where Sentences (1) and (2) are complied with.
A pressure-relief valve and temperature-relief valve may be combined where Sentences (1) and (2) are complied with.
4) Every indirect service water heater shall be equipped with
Every indirect service water heater shall be equipped witha) a pressure-relief valve, and
b) a temperature-relief valve on every storage tank that forms part of the system.
5) Every pipe that conveys water from a temperature-relief, pressure-relief or combined temperature- and pressure-relief valve shall
Every pipe that conveys water from a temperature-relief, pressure-relief or combined temperature- and pressure-relief valve shallb) be rigid, slope downward from the valve, and terminate with an indirect
connection above a floor drain, sump, or other safe location, with an air break of not more than 300 mm,
c) have no thread at its outlet, and
d) be capable of operating at a temperature of not less than
99°C.
(See Appendix A.)6) The temperature-relief valve required in Clause (4)(b) shall
The temperature-relief valve required in Clause (4)(b) shalla) have a temperature-sensing element located within the top 150 mm of the tank, and
b) be designed to open and discharge sufficient water to keep the temperature of the water in the tank from exceeding 99°C under all operating conditions.
7) No shut-off valve shall be installed on the pipe between any tank and the relief valves or on the discharge lines from such relief
valves.
No shut-off valve shall be installed on the pipe between any tank and the relief valves or on the discharge lines from such relief
valves.
8) A vacuum-relief valve shall be installed when any tank may be subject to back-siphonage.
A vacuum-relief valve shall be installed when any tank may be subject to back-siphonage. 9) A storage-type service water heater that is located in a ceiling or roof space, or over a floor of wood construction, shall be installed
within a corrosion-resistant watertight drain pan, as described in Sentence (10).
A storage-type service water heater that is located in a ceiling or roof space, or over a floor of wood construction, shall be installed
within a corrosion-resistant watertight drain pan, as described in Sentence (10). 10) The drain pan shall
The drain pan shalla) be not less than 50 mm larger than the tank and have side walls not less than 25 mm high,
b) be drained by a pipe two sizes larger than the relief valve discharge pipe, and
c) have a drain that is located directly under the relief valve discharge pipe
and that discharges directly to a floor drain or other acceptable
location.
2.6.1.8. Solar Domestic Hot Water Systems
1) Systems for solar heating of potable water shall be installed in conformance with 
CAN/CSA-F383, “Installation of Packaged Solar Domestic Hot Water Systems.”
CAN/CSA-F383, “Installation of Packaged Solar Domestic Hot Water Systems.”
2.6.1.9. Water Hammer
1) Provision shall be made to protect the water distribution system from the adverse effects of water hammer. (See Appendix A.)
Provision shall be made to protect the water distribution system from the adverse effects of water hammer. (See Appendix A.)2.6.1.10. Mobile Home Water Service
1) A water service pipe intended to serve a mobile home shall
A water service pipe intended to serve a mobile home shalla) be not less than ¾ inch in size,
b) terminate above ground, and
c) be provided with
i) a tamperproof terminal connection that is capable of being repeatedly
connected, disconnected and sealed,
ii) a protective concrete pad,
iii) a means to protect it from frost heave, and
iv) a curb stop and a means of draining that part of the pipe located
above the frost line when not in use.
2.6.1.11. Thermal Expansion
1) Protection against thermal expansion shall be required when a check valve is required by Article 2.6.1.5., a backflow preventer by Article 2.6.2.6., or a pressure-reducing valve by Article 2.6.3.3. (See Appendix A.)
Protection against thermal expansion shall be required when a check valve is required by Article 2.6.1.5., a backflow preventer by Article 2.6.2.6., or a pressure-reducing valve by Article 2.6.3.3. (See Appendix A.)2.6.1.12. Service Water Heaters
1) Thermostat controls for electric storage-type service water heaters shall be set at a temperature of 60°C. (See Appendix A.)
Thermostat controls for electric storage-type service water heaters shall be set at a temperature of 60°C. (See Appendix A.)
2.6.2. Protection from Contamination
2.6.2.1. Connection of Systems
1) Except as provided in Sentence (2), connections to potable water systems shall be designed and installed so that non-potable water or substances that may render the water non-potable cannot enter the system.
Except as provided in Sentence (2), connections to potable water systems shall be designed and installed so that non-potable water or substances that may render the water non-potable cannot enter the system. 2) A water treatment device or apparatus shall not be installed unless it can be demonstrated that the device or apparatus will not
introduce substances into the system that may endanger health.
A water treatment device or apparatus shall not be installed unless it can be demonstrated that the device or apparatus will not
introduce substances into the system that may endanger health.
3) Backflow preventers shall be selected and installed in conformance with CSA B64.10, “Selection and Installation of Backflow Preventers.” (See Appendix A.)
Backflow preventers shall be selected and installed in conformance with CSA B64.10, “Selection and Installation of Backflow Preventers.” (See Appendix A.) 2.6.2.2. Back-Siphonage
1) Potable water connections to fixtures, tanks, vats or other devices not subject to pressure above atmospheric and containing other than potable water shall be installed so as to prevent back-siphonage in conformance with Sentence (2).
Potable water connections to fixtures, tanks, vats or other devices not subject to pressure above atmospheric and containing other than potable water shall be installed so as to prevent back-siphonage in conformance with Sentence (2). 2) Except as provided in Sentence 2.6.2.10.(2), back-siphonage shall be prevented by the installation of
Except as provided in Sentence 2.6.2.10.(2), back-siphonage shall be prevented by the installation ofa) an air gap,
b) an atmospheric vacuum breaker,
c) a pressure vacuum breaker,
d) a hose connection vacuum breaker,
e) a dual check valve backflow preventer with atmospheric port,
f) a double check valve assembly,
g) a reduced pressure principle backflow preventer,
h) a dual check valve backflow preventer,
i) a laboratory faucet type vacuum breaker, or
j) a dual check valve backflow preventer with vent.
2.6.2.3. Backflow Caused by Back Pressure
1) Potable water connections to fixtures, tanks, vats, boilers or other devices containing other than potable water and subject to pressure above atmospheric shall be arranged to prevent backflow caused by back pressure in conformance with Sentences (2) and (3).
Potable water connections to fixtures, tanks, vats, boilers or other devices containing other than potable water and subject to pressure above atmospheric shall be arranged to prevent backflow caused by back pressure in conformance with Sentences (2) and (3). 2) Except as provided in Article 2.6.2.4., backflow caused by back pressure of non-toxic substances into a potable water system shall be prevented by the installation of
Except as provided in Article 2.6.2.4., backflow caused by back pressure of non-toxic substances into a potable water system shall be prevented by the installation ofa) an air gap,
b) a dual check valve backflow preventer with atmospheric port,
c) a dual check valve backflow preventer,
d) a dual check valve backflow preventer with vent,
e) a double check valve assembly, or
f) a reduced pressure principle backflow preventer.
3) Backflow caused by back pressure of toxic substances into a potable water system shall be prevented by the installation of
Backflow caused by back pressure of toxic substances into a potable water system shall be prevented by the installation ofa) an air gap, or
b) a reduced pressure principle backflow preventer.
2.6.2.4. Backflow from Fire Protection Systems
1) A backflow preventer shall not be required in residential full flow-through fire sprinkler/standpipe systems in which the pipes and fittings are
constructed of potable water system materials.
A backflow preventer shall not be required in residential full flow-through fire sprinkler/standpipe systems in which the pipes and fittings are
constructed of potable water system materials.
2) Except as required by Sentence (4), potable water system connections to fire sprinkler and standpipe systems shall be
protected against backflow caused by back-siphonage or back pressure in conformance with Clauses (a) to (f):
Except as required by Sentence (4), potable water system connections to fire sprinkler and standpipe systems shall be
protected against backflow caused by back-siphonage or back pressure in conformance with Clauses (a) to (f):a) residential partial flow-through fire sprinkler/standpipe systems in which the pipes and fittings are
constructed of potable water system materials shall be protected by a dual check valve backflow preventer conforming to CSA B64.6.1, “Dual Check Valve Backflow Preventers for Fire Protection Systems (DuCF),”
CSA B64.6.1, “Dual Check Valve Backflow Preventers for Fire Protection Systems (DuCF),”b) Class 1 fire sprinkler/standpipe systems shall be protected by a single check valve backflow preventer conforming to CSA B64.9, “Single Check Valve Backflow Preventers for Fire Protection Systems (SCVAF),” provided that the systems do not use antifreeze or other additives of any kind and that all pipes and fittings
are constructed of potable water system materials,
CSA B64.9, “Single Check Valve Backflow Preventers for Fire Protection Systems (SCVAF),” provided that the systems do not use antifreeze or other additives of any kind and that all pipes and fittings
are constructed of potable water system materials, c) Class 1 fire sprinkler/standpipe systems not covered by Clause (b) as well as Class 2 and Class 3 fire sprinkler/standpipe systems shall be protected by a double
check valve backflow preventer conforming to CSA B64.5.1, “Double Check Valve Backflow Preventers for Fire Protection Systems (DCVAF),” provided that the systems do not use antifreeze or other additives of any kind,
CSA B64.5.1, “Double Check Valve Backflow Preventers for Fire Protection Systems (DCVAF),” provided that the systems do not use antifreeze or other additives of any kind,
d) Class 1, Class 2 and Class 3 fire sprinkler/standpipe systems in which antifreeze or other additives are used shall be
protected by a reduced pressure principle backflow preventer conforming to CSA B64.4.1, “Reduced Pressure Principle Backflow Preventers for Fire Protection Systems (RPF),” installed on the portion of the system that uses the additives and the balance of the system shall be protected as
required by Clauses (b) or (c),
CSA B64.4.1, “Reduced Pressure Principle Backflow Preventers for Fire Protection Systems (RPF),” installed on the portion of the system that uses the additives and the balance of the system shall be protected as
required by Clauses (b) or (c), e) Class 4 and Class 5 fire sprinkler/standpipe systems shall be protected by a
reduced pressure principle backflow preventer conforming to CSA B64.4.1, “Reduced Pressure Principle Backflow Preventers for Fire Protection Systems (RPF),” or
CSA B64.4.1, “Reduced Pressure Principle Backflow Preventers for Fire Protection Systems (RPF),” or f) Class 6 fire sprinkler/standpipe systems shall be protected
(See Appendix A.)i) by a double check valve backflow preventer conforming to CSA B64.5.1, “Double Check Valve Backflow Preventers for Fire Protection Systems (DCVAF),” or
CSA B64.5.1, “Double Check Valve Backflow Preventers for Fire Protection Systems (DCVAF),” orii) where a potentially severe health hazard may be caused by backflow, by a reduced pressure principle backflow preventer conforming to CSA B64.4.1, “Reduced Pressure Principle Backflow Preventers for Fire Protection Systems (RPF),”
CSA B64.4.1, “Reduced Pressure Principle Backflow Preventers for Fire Protection Systems (RPF),”3) Backflow preventers required by Sentence (2) shall be installed upstream of the fire department pumper connection. (See Appendix A.)
Backflow preventers required by Sentence (2) shall be installed upstream of the fire department pumper connection. (See Appendix A.) 4) Where a reduced pressure principle backflow preventer is required on a water service pipe at a fire service connection located on the same premises as the
fire service pipe in Class 3, 4, 5 and 6 fire sprinkler/standpipe systems, a reduced pressure principle backflow preventer conforming to CSA B64.4.1, “Reduced Pressure Principle Backflow Preventers for Fire Protection Systems (RPF),” shall also be required on the fire service connection.
Where a reduced pressure principle backflow preventer is required on a water service pipe at a fire service connection located on the same premises as the
fire service pipe in Class 3, 4, 5 and 6 fire sprinkler/standpipe systems, a reduced pressure principle backflow preventer conforming to CSA B64.4.1, “Reduced Pressure Principle Backflow Preventers for Fire Protection Systems (RPF),” shall also be required on the fire service connection.
2.6.2.5. Separation of Water Supply Systems
1) No private water supply system shall be interconnected with a public water supply system.
No private water supply system shall be interconnected with a public water supply system. 2.6.2.6. Premise Isolation
1) In addition to the backflow preventer required by this Subsection for buildings or facilities where a potentially severe health hazard may be caused by backflow, the potable water system shall be provided with premise isolation by the installation of a reduced pressure principle backflow preventer. (See Appendix A.)
In addition to the backflow preventer required by this Subsection for buildings or facilities where a potentially severe health hazard may be caused by backflow, the potable water system shall be provided with premise isolation by the installation of a reduced pressure principle backflow preventer. (See Appendix A.) 2.6.2.7. Hose Bibb
1) Where a hose bibb is installed outside a building, inside a garage or in an area where there is an identifiable risk of contamination, the potable water system shall be protected against backflow through the hose bibb.
Where a hose bibb is installed outside a building, inside a garage or in an area where there is an identifiable risk of contamination, the potable water system shall be protected against backflow through the hose bibb. 2.6.2.8. Cleaning of Systems
1) A newly installed part of a potable water system shall be cleaned and then flushed with potable water before the system is put into operation.
A newly installed part of a potable water system shall be cleaned and then flushed with potable water before the system is put into operation.
2.6.2.9. Air Gap
1) An air gap shall not be located in a noxious environment.
An air gap shall not be located in a noxious environment.
2) Every air gap shall be not less than 25 mm high and at least twice the diameter of the opening of the water supply outlet in
height. (See Appendix A.)
Every air gap shall be not less than 25 mm high and at least twice the diameter of the opening of the water supply outlet in
height. (See Appendix A.)2.6.2.10. Vacuum Breakers
1) Where the critical level is not marked on an atmospheric vacuum breaker or pressure vacuum breaker, the critical level shall be taken as the lowest point on the device.
Where the critical level is not marked on an atmospheric vacuum breaker or pressure vacuum breaker, the critical level shall be taken as the lowest point on the device.
2) Where an atmospheric vacuum breaker is installed, it shall be located on the downstream side of the fixture control valve or faucet so that it will be subject to water supply pressure
Where an atmospheric vacuum breaker is installed, it shall be located on the downstream side of the fixture control valve or faucet so that it will be subject to water supply pressurea) only when the valve or faucet is open, and
b) for periods of continuous use not exceeding 12 h.
(See Appendix A.)3) An atmospheric vacuum breaker shall be installed so that the critical level is at least the distance specified by the manufacturer at which the device will operate safely but not less
than 25 mm above
An atmospheric vacuum breaker shall be installed so that the critical level is at least the distance specified by the manufacturer at which the device will operate safely but not less
than 25 mm abovea) the flood level rim of a fixture or tank, or
b) the highest point open to atmosphere in an irrigation system.
4) A pressure vacuum breaker shall be installed so that the critical level is not less than 300 mm above
A pressure vacuum breaker shall be installed so that the critical level is not less than 300 mm abovea) the flood level rim of a fixture or tank, or
b) the highest point open to atmosphere in an irrigation system.
2.6.2.11. Tank-Type Water Closets
1) Tank-type water closets shall be provided with a back-siphonage preventer in conformance with Sentence 2.2.10.10.(2).
Tank-type water closets shall be provided with a back-siphonage preventer in conformance with Sentence 2.2.10.10.(2). 2.6.2.12. Backflow Preventers
1) No bypass piping or other device capable of reducing the effectiveness of a backflow preventer shall be installed in a water supply system.
No bypass piping or other device capable of reducing the effectiveness of a backflow preventer shall be installed in a water supply system.
2.6.3. Size and Capacity of Pipes
(See Appendix A.)2.6.3.1. Design, Fabrication and Installation
(See Appendix A.)1) Every water distribution system shall be designed to provide peak demand flow when the flow pressures at the supply openings conform to the plumbing supply fitting manufacturer’s specifications.
Every water distribution system shall be designed to provide peak demand flow when the flow pressures at the supply openings conform to the plumbing supply fitting manufacturer’s specifications.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.)
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.”
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.”2.6.3.2. 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.
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.
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.
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 C. (See Appendix A.)
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 C. (See Appendix A.) | 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) | |||||||
|
Fixture or Device |
Minimum Size of Supply Pipe, inches |
Private Use Hydraulic Load, fixture units |
Public Use Hydraulic Load, fixture units | ||||
| Cold | Hot | Total | Cold | Hot | Total | ||
|
Bathroom group with 6 LPF flush tank(3) |
n/a | 2.7 | 1.5 | 3.6 | - | - | - |
|
Bathroom group with greater than 6 LPF flush tank(3) |
n/a | 4 | 3 | 6 | - | - | - |
|
Bathroom group with more than 3 fixtures |
- | - | - | - | - | - | |
| Bathtub with or without shower head | ½ | 1 | 1 | 1.4 | 3 | 3 | 4 |
| Bathtub with ¾ inch spout | ¾ | 7.5 | 7.5 | 10 | 7.5 | 7.5 | 10 |
| Bedpan washer | 1 | - | - | - | 7.5 | 7.5 | 10 |
| Bidet | ⅜ | 1.5 | 1.5 | 2 | - | - | - |
| Clothes washer 3.5 kg | ½ | 1 | 1 | 1.4 | 2.25 | 2.25 | 3 |
| Clothes washer 6.8 kg | ½ | - | - | - | 3 | 3 | 4 |
|
Clothes washer, commercial(5) |
- | - | - | - | - | - | - |
| Dental lavatory | ⅜ | - | - | - | 1.5 | 1.5 | 2 |
| Dental unit, cuspidor | ⅜ | - | - | - | 1 | - | 1 |
|
Dishwasher, commercial(5) |
- | - | - | - | - | - | - |
| Dishwasher, domestic | ⅜ | - | 1.4 | 1.4 | - | - | - |
| Drinking fountain or water cooler | ⅜ | - | - | - | 0.25 | - | 0.25 |
| Hose bibb | ½ | 2.5 | - | 2.5 | 2.5 | - | 2.5 |
| Hose bibb | ¾ | 3 | - | 3 | 6 | - | 6 |
| Hose bibb, combination hot and cold | ½ | 1.9 | 1.9 | 2.5 | 1.9 | 1.9 | 2.5 |
| Lavatory, 8.3 LPM or less | ⅜ | 0.5 | 0.5 | 0.7 | 1.5 | 1.5 | 2 |
| Lavatory, greater than 8.3 LPM | ⅜ | 0.75 | 0.75 | 1 | 1.5 | 1.5 | 2 |
| Sink, bar | ⅜ | 0.75 | 0.75 | 1 | 1.5 | 1.5 | 2 |
| Sink, clinic service faucet | ½ | - | - | - | 2.25 | 2.25 | 3 |
| Sink, clinic service with direct flush valve | 1 | - | - | - | 6 | - | 6 |
| Sink, kitchen commercial, per faucet | ½ | - | - | - | 3 | 3 | 4 |
| Sink, kitchen domestic, 8.3 LPM | ⅜ | 1 | 1 | 1.4 | 1 | 1 | 1.4 |
| Sink, kitchen domestic, greater than 8.3 LPM | ⅜ | 1.5 | 1.5 | 2 | 1.5 | 1.5 | 2 |
| Sink, laboratory | ⅜ | - | - | - | 1.5 | 1.5 | 2 |
| Sink, laundry (1 or 2 compartments) | ⅜ | 1 | 1 | 1.4 | 1 | 1 | 1.4 |
| Sink, service or mop basin | ½ | - | - | - | 2.25 | 2.25 | 3 |
| Sink, washup, per faucet | ½ | - | - | - | 1.5 | 1.5 | 2 |
| Shower head, 9.5 LPM or less per head | ½ | 1 | 1 | 1.4 | 3 | 3 | 4 |
| Shower head, greater than 9.5 LPM per head | ½ | 1.5 | 1.5 | 2 | 3 | 3 | 4 |
| Shower, spray, multi-head, fixture unit per head | (5) | 1 | 1 | 1.4 | 3 | 3 | 4 |
| Urinal, with direct flush valve | ¾ | - |
- |
||||
| Urinal, with flush tank | ⅜ | 3 | - | 3 | 3 | - | 3 |
| Urinal, with self-closing metering valve | ½ | 2 | - | 2 | 4 | _ | 4 |
| Water closet, 6 LPF or less with flush tank | ⅜ | 2.2 | - | 2.2 | 2.2 | - | 2.2 |
| Water closet, greater than 6 LPF with flush tank | ⅜ | 3 | - | 3 | 5 | - | 5 |
| Water closet, with direct flush valve | 1 | - | - | ||||
| Notes to Table 2.6.3.2.A: | |
|
|
|
| (1) | The fixture unit values in this Table are not applicable in certain assembly occupancies because of surges in use by the occupants. For such occupancies, refer to specific design information. |
| (2) | For fixtures not indicated in this Table, refer to Table 2.6.3.2.D. |
| (3) | Bathroom group is based on a ½-inch size bathtub supply pipe. |
| (4) | Add additional fixture to the fixture load for bathroom group. |
| (5) | Refer to manufacturer's recommendations. |
| (6) | For fixture unit values for fixtures with direct flush valves, see Sentence 2.6.3.2.(4) and Tables 2.6.3.2.B and 2.6.3.2.C. |
| Table 2.6.3.2.B Sizing of Water Distribution Systems for Urinals with Direct Flush Valves Forming part of Sentences 2.6.3.2.(4) and 2.6.3.4.(5) | ||
| Number of Valves | Individual Fixture Unit Assigned in Decreasing Values | Fixture Units in Accumulative Values(1) |
| 1 | 20 | 20 |
| 2 | 15 | 35 |
| 3 | 10 | 45 |
| 4 | 8 | 53 |
| 5 or more | 5 each | 58, plus 5 for each additional fixture in excess of 5 |
| Notes to Table 2.6.3.2.B: | |
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| (1) | The accumulative fixture unit values are the total values to be used in conjunction with Table 2.6.3.2.A. |
| 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) | ||
| Number of Valves | Individual Fixture Unit Assigned in Decreasing Values | Fixture Units in Accumulative Values(1) |
| 1 | 40 | 40 |
| 2 | 30 | 70 |
| 3 | 20 | 90 |
| 4 | 15 | 105 |
| 5 or more | 10 for each public use and 6 for each private use |
115, plus 10 for each public use additional fixture in excess of 5 and 111, plus 6 for each private use additional fixture in excess of 5 |
| Notes to Table 2.6.3.2.C: | |
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| (1) | The accumulative fixture unit values are the total values to be used in conjunction with Table 2.6.3.2.A. |
| 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 (3) and 2.6.3.4.(5) | ||
| Size of Supply Pipe, inches | Hydraulic Load, fixture units | |
| Private Use | Public Use | |
| ⅜ | 1 | 2 |
| ½ | 2 | 4 |
| ¾ | 3 | 6 |
| 1 | 6 | 10 |
2.6.3.3. 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.
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. 2.6.3.4. Size
1) Every water service pipe shall be sized according to the peak demand flow but shall not be less than ¾ inch size.
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
Except as provided in Sentence (3), the size of a supply pipe that serves a fixture shall conform to Table 2.6.3.2.A3) 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 750 mm long and not less than 6.3 mm inside diameter may be used to supply water to the fixture.
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 750 mm long and not less than 6.3 mm inside diameter may be used to supply water to the fixture. 4) Reserved.
Reserved.
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
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., wherea) 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, B, C or 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.
(See Appendix A.)| Table 2.6.3.4.Water Pipe Sizing for Buildings Containing One or Two Dwelling Units or Row Houses with Separate Water Service Pipes Forming part of Sentence 2.6.3.4.(5) | |||
| Size of Water Pipe, inches | Water Velocity, m/s(1) | ||
| 3.0 | 2.4 | 1.5 | |
| Hydraulic Load, fixture units | |||
| ½ | 8 | 7 | 4 |
| ¾ | 21 | 16 | 9 |
| 1 | 43 | 31 | 18 |
| 1¼ | 83 | 57 | 30 |
| Notes to Table 2.6.3.4.: | |
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| (1) | Table 2.6.3.4. is not intended to limit water velocities that are permitted by Sentence 2.6.3.5.(1). |
2.6.3.5. Velocity
1) The maximum permitted water velocities shall be those recommended by the pipe and fitting manufacturer.
The maximum permitted water velocities shall be those recommended by the pipe and fitting manufacturer.