RNPCP - CHAPTER 8 INDIRECT WASTE PIPING, WET VENTED SYSTEMS AND SPECIAL WASTES

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.

13mm diameter

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.

60oCMaximum 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.

19mm diameter

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.

102mm

Sumps and condensers shall contain a volume of not less than twice the volume of water removed from the boiler connected there to when the normal water level is reduced not less than ______.

3.2mm

Minimum thickness of chemical

½ the area of drain

Minimum area of CW & VS vent

1 and 2F.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 diameter

Minimum size of wet vent.

152mm

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.

0.60m.

Maximum length of the tailpiece.

51mm diameter

Cleanouts may not be required on any wet

32mm

1 inlet serving not more than 2.8 rn3 refrigeration space

51mm

4 to 12m3 refrigeration space

76mm

13 to 36m3 refrigeration space

INDIRECT WASTE CONDITIONS

The airgap for drainage shall be not less than 25mm between the plumbing fixture, appliance or appurtenance outlet & the rim of the floor sink or receptor.

INDIRECT WASTE PIPING

waste pipes less than 4.6m in length need not to be larger in diameter than the drain outlet or tailpiece of the fixture or 13mm in diameter min.

INDIRECT WASTE RECEPTORS

No standpipe receptor for any clotheswasher shall extend more than 8m or less than 0.45m above its trap. Stills, sterilizers & simillar equipment shall be drain through an airgap.

CHEMICAL WASTES

Where acid or corrosive chemical is placed & each vent pipe connected thereto, shall be constructed of chemical

VERTICAL WET PIPING

Wet venting is limited to vertical drainage piping receiving the discharge from the trap arm of one (1) & two (2) fixture unit. Fixtures that also serves as a vent for not to exceed four (4) fixtures.

19.1mm

min. size of condensate wastes pipe

Air

conditioning condensate waste pipes