Chapter 8

• more than 1.5m, less than 4.6 m Length of indirect waste pipe to be directly trapped, but need not 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 dia Minimum diameter of indirect waste pipe.
• 0.45m to 0.80m Extension of standpipe receptor for clotheswasher above its trap.
• 15 cm to 45 cm Height of the trap for clotheswasher 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 dia For condensers and sumps, diameter of the opening serving as siphon breaker at the top of the deep seal trap.
• 1/2 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.
• 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 dia 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 tailpiece
• 51 mm dia Cleanouts may not be required on any wet-vented branch serving a single trap when the fixture tailpiece or connection is larger than