Important Numbers 2

0.30 m

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

0.30 m

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

4 feet (1219 mm)

Maximum intervals of piping supports.

3 feet (914 mm)

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

¼ inch

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

19 mm Ø

Minimum size of water service pipe.

13 mm Ø

Minimum size of building supply and branches.

152 mm

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

0.30 m

Minimum depth of vitrified clay pipes or fittings below the ground.

2%

Allowable grade for the threads of draining fittings.

6 F.U.

Fixture unit rating of clothes washers in groups of 3.

2 F.U.

Fixture unit rating for every 0.063 L/s of continuous flow from sump pump or ejector.

15 m

Intervals of cleanouts on each run of piping more than 1 meter in total developed length.

Less than 1.5 m

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

72° or less

Slope of short horizontal drainage pipe where cleanouts may be omitted.

Exceeding 135°

Aggregate offset angle to be provided with an additional cleanout.

305 mm

Front clearance for cleanouts 51 mm or less.

450 mm

Front clearance for cleanouts larger than 51 mm.

0.45 m

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

0.75 m

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

6.1 m

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

50.8 mm

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

51 mm

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

51 mm Ø

Minimum size of vent for sumps and receiving tanks.

3 kg/m

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

2.4 m

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

4

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

3

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

32 mm Ø

Minimum diameter of an individual vent, or not less than ½ of the diameter of the drain.

1/3

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

more than 1.5 m but less than 4.6 m

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

Less than 4.6 m

Length of indirect waste pipe need not to be larger in diameter than the drain outlet or tailpiece.

13 mm Ø

Minimum diameter of indirect waste pipe.

0.45 m to 0.80 m

Extension of standpipe receptor for clothes washer above its trap.

0.15 m to 0.45 m

Height of the trap for clothes washer standpipe receptor above the floor.

60°C

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

152 mm

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

19 mm Ø

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

½

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 condenser or sump.

102 mm

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

13 mm

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

GA 12 (2.77 mm)

Minimum thickness of metal condensers.

102 mm

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 ____.

3.2 mm

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

½ the area of drain

Minimum area of CW & VS vent.

1 and 2 F.U.

Fixture unit limit of wet venting.

4 fixtures

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

1 pipe size larger; 51 mm Ø

Minimum size of wet vent.

152 mm

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

more than 4.6 m

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

2 pipe sizes larger

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

0.60 m

Maximum length of the tailpiece.

51 mm Ø

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

32 mm

1 inlet serving not more than 2.8 m³ refrigeration space.

51 mm

4 to 12 m³ refrigeration space.

76 mm

13 to 36 m³ refrigeration space.

150 mm

Minimum height of galvanized iron or galvanized steel pipe above the ground.

152 mm

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

1 pipe size increase

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

0.15 m

Minimum extension of a vent pipe above the roof or fire wall.

0.30 m

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

3 m

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

0.90 m

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

0.90 m

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

3 m

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

2.1 m

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

10

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

every 5 floors

Intervals of yoke vent.

not less than 1 m

Yoke vent connection with the vent stack above the floor level.

32 mm

Minimum size of an individual vent.

½ the diameter

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

1/3

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

2 fixtures

May be served by a common vertical vent.

3

Number of single compartment sinks or laundry tubs of the same depth, or lavatories that can be served by one trap.

0.75 m

Maximum center-to-center distance of adjacent fixtures being served by a single trap.

0.60 m

Maximum length of tailpiece.

2 times trap diameter

Minimum horizontal distance of a trap arm to vent.

more than 90°

Trap arm change of direction not requiring a cleanout.

less than 22 ½°

For trap arms 75 mm Ø and larger, the change of direction not requiring a cleanout.

1.8 m max.

Developed length between the trap of a water closet from the top of closet ring to inner edge of vent.

GA 17 B&S (1.1 mm)

Minimum thickness of exposed and readily accessible drawn brass tubing trap.

1

Maximum number of slip joint that may be used on outlet side of a trap.

51 mm to 102 mm

Depth or trap seals.

152 mm

Minimum water seal for sand interceptors and similar clarifiers.

1.3 L/s to 3.4 L/s

Rate of flow of an individual grease trap.

2-½

The total capacity of fixtures discharging into a grease trap shall not exceed ____ times than the flow rate of the grease trap.

4

Maximum number of fixtures connected to one grease trap.

1.2 m

Maximum horizontal distance between the fixture outlet and the grease trap, so grease trap may serve as fixture trap.

0.75 m

Maximum vertical tailpipe or drain between the fixture outlet and the grease trap, so grease trap may serve as fixture trap.

51 mm

Minimum water seal for grease trap.

12.7 mm or larger

Size of solids to be screened from laundry discharge by means removable wire basket.