RNPCP Chapter 6 to 9

Report

Question list

Minimum air gap for fixtures not affected by sidewalls

2x diameter

Minimum air gap for fixtures affected by sidewalls

3x diameter

Airgap less than 25mm shall only be approved if tested with vacuums of mercury from 0 to ____

63.5cm

Minimum distance of Atmospheric Vacuum Breaker (AVB) above all downstream piping and floor level rim of receptor

150mm or 6"

Mininum space clearance between the lowest portion of the assembly and the grade, floor or platform for access and clearance

30.5cm

Minimum temperature of the AVB critical pevel above overflow rim of a water closet bowl or the highest part of a urinal

43.3°C (110°F)

Minimum height of the AVB critical level above the overflow rim of a water closet bowl or the highest part of a urinal

152mm

Mininum distance of Double Check Valve (DC) assembly above all downstream piping and floor level rim of receptor

30.5cm

Elevation of installations above the floor or grade to be provided with a permanent platform.

1.52m or 5'

Minimum airgap for water distribution, or a mininum of 2x diameter

25mm

Mininum height of ballcock's critical level above the full opening of the overflow pipe

25mm

Mininum installation height of listed non removable hose bibb type backflow preventer above the highest point of usage.

152mm

Size of iron cast fittings to be galvanized when used in water piping

51mm or smaller

Maximum lead content for water pipes and fittings

Number of mesh per 25mm for gravity tanks vent screen

14 to 18

Inadequate water pressure is less than:

103kPa

Excessive water pressure is more than:

551kPa

Percentage of reduced pressure used for all pipe size determination

80%

Maximum pressure setting for pressure relief valve

1033 kPa

Height of the drain pipe of pressure relief valve above the ground and pointing downward

152mm to 600mm

Distance between bottom of water pipe and top of the sewer or drain line

0.30m

Horizontal distance between the water line and the sewer or drain line

0.30m

Distance between sewer or drainage piping and water pipes crossing above such pipes

0.30m

Maximum distance of unions away from regulating equipment, water heater, conditioning tank, or similar.

0.30m

Maximum intervals of piping supports

4' or 1219mm

Support trap arms more than _____ in length shall be as close as possible

3' or 914mm

Closet rings shall be tightly fastened up to the floor with top surface _____ above finish floor.

1/4"

Mininum size of water service pipe

19mm

Minimum size of building supply and branches

13mm

Minimum clearance of galvanized wrought iron or galvanized steel pipe above ground

152mm or 6"

Minimum depth of vitrified clay pipes or fittings below the ground

0.3m

Allowable grades for the threads of drainage fittings

Fixture rating of clotheswasher in groups of 3

6 FU

Fixture unit rating for every 0.063 L/s (1gpm) of contiuous flow from sump pump or ejector

2 FU

Intervals of cleanouts on each run of piping

15m

Length of horizontal drain line where cleanouts maybe omitted, except in lines serving sinks or urinals.

< 1.5m

Slope of horizontal drainage pipe where cleanouts may be omitted

72° or less

Aggregate offset angle to be provided with an additional cleanout

135° or more

Front clearance for cleanouts 51mm or less

305mm or 12"

Front clearance for cleanouts more than 51mm

450mm or 18"

Vertical clearance from the means of access for cleanouts installed in underground piping

0.45m

Horizontal clearance from the means of access for cleanouts installed in underground piping

0.75m

Maximum distance of underfloor cleanout from an access door, trap door or crawl hole.

6.1m

Minimum size of pump discharge pipe from a sump having a water closet

51mm or 2"

Minimum distance of the invert of the lowest inlet above the high water or starting level of sumps and receiving tanks

51mm or 2"

Minimum size of vent for sumps and receiving tanks

51mm or 2"

Minimum air pressure to be maintained for each meter of height the sewage is raised

3 kg/m

Distance within the vertical to horizontal change of a stack containing suds producing fixtures where no drainage connection shall be made

2.4

Number of water closets or 6 fixture unit traps allowed on any vertical stack

Number of water closets or 6 fixture unit traps allowed on any horizontal branch or drain

Minimum diameter of individual vent, or not less than 1/2 of the diameter of the drain

32mm or 1 1/4"

Fraction of the total permitted length of any vent allowed to be installed in a horizontal position

1/3

Length of indirect waste pipe to be directly trapped but no need to be vented

1.5m to 4.6m (5' to 15')

Length of indirect waste pipe if diameter is less than the drain outlet or tailpiece

<4.6m

Minimum diameter of indirect waste pipe

13mm or 1/2"

Extension of standpipe receptor of clotheswasher above its pipe

0.45m to 0.8m (16" to 30")

Height of trap of clotheswasher standpipe receptor above the floor

0.15m to 0.45m (6" to 16")

Maximum temperature allowed for water to be discharged under pressure directly into the drainage system

60°C (140°F)

For condensers and sumps, the extension of the deep seal trap within the bottom of the trap

152mm (6")

For condensers and sumps, diameter of the opening serving as siphon breaker at the top of the deep seal trap.

19mm (3/4")

Outlets shall be taken off from the side in a manner to allow a water line to be maintained that permanently occupies not less than ___ the capacity of the condensers or sump.

1/2

Minimum thickness of walls and bottom of sumps, condensers or intercepting tanks constructed of concrete

102mm (4")

Minimum thickness of plaster on the inside walls of sumps and condensers, etc

13mm (1/2")

Minimum thickness of metal condensers

GA 12 (2.77mm)

Sumps and condensers shall contain a volume of not less than twice the volume of water removed from the boiler connected thereto when the normal water level is reduced not less than ___

102mm (4")

Minimum thickness of chemical-resistant glass lined pipe, high silicon iron pipe or lead pipe receiving acid or corrosive chemicals.

3.2mm

Minimum area of CW & VS vent

1/2 the area of drain

Fixture unit limit for wet venting

2FU

Maximum number of fixtures can be served by a vertical wet vent.

Minimum size of wet vent

1 pipe size larger or 51mm

Connection of the returned vent for island fixtures to the horizontal drain above the flood level rim

152mm (6")

In CW & VS, length of branch that must be separately vented.

more than 4.6m

Minimum size of waste pipe and trap in any CW & VS, in reference to the sizes required and tailpiece size

2 pipe size larger

Maximum length of tailpiece

0.6m

Cleanouts may not be required on any wet-vented branch serving a single trap when the fixture tailpiece or connection is larger than ___

51mm (2")

1 inlet serving not more than 2.8 cu.m refrigeration space

32mm (1 1/4")

1 inlet serving 4-12 cu.m of refrigeration space

51mm (2")

1 inlet serving 13-36 cu.m of refrigeration space

76mm (3")

Minimum rise of each vent above the highest flood level rim before offsetting horizontally to join the vent stack or stack vent

152mm (6")

Increase in size of vent stack above the reconnection point of stack and horizontal vent

1 pipe size

Minimum extension of a vent pipe above the roof or firewall

0.15m or 6"

Minimum clearance of a vent through the roof from any vertical surface nearby.

0.30m or 12"

Horizontal distance of a vent opening away from any openable window, door opening, air intake, or vent shaft

Vertical distance of a vent opening above any openable window, door opening, air intake, or vent shaft

0.90m or 3'

Horizontal distance of a vent opening away from any lot line, alley, and street boundary lines

0.90m or 3'

Horizontal distance of a vertical vent away from any part of the roof that is used for other purposes

Vertical extension of a vent above any roof that is used for other purposes.

2.1m

Each soil or waste stack which extends _____ or more stories above the building drain shall be served by a parallel vent stack

Intervals of yoke vent

every 5 floors

Yoke vent connection with the vent stack above the floor level

not more than 1m

Minimum size of an individual vent

32mm or 1 1/4"

Minimum size of an individual vent but not less than 32 mm

1/2 the diameter

Fraction of the total permitted length of any vent allowed to be installed in a horizontal position

1/3

May be served by a common vertical vent

2 fixtures

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