Modern septic tank design and fittings9/25/2023 ![]() The tank floor must be waterproof and strong enough to withstand earth movement while supporting the tank weight, walls, and insides. The pipe should have a protective mosquito-proof mesh cage. Pipe VentilationĮach septic tank must include a ventilating pipe with a diameter of at least 50 mm. The partition must be placed so that the first chamber’s capacity is twice that of the second chamber.Īt about 300 mm below TWL, suitable openings (rectangular or circular) with a minimum dia of 100 mm and a maximum dia of 150 mm should be provided in the partition.Įach septic tank compartment should have a rectangular access opening no smaller than 455 x 610 mm or a circular opening no smaller than 500 mm in diameter. When a septic tank’s capacity exceeds 2000 litres, it can be separated into two chambers with a fixed, long-lasting partition. The outlet pipe’s invert must be 50 mm lower than the inlet pipe’s invert. The top body part grows above the scum level, and the bottom body part prolongs to approximately 1/3 of the water depth below the TWL. ![]() Outlet pipesįor tanks, less than 1200 mm wide, the outlet pipe should be a 100 mm nominal bore dip-pipe positioned inside the tank. ![]() The pipe must be installed within the tank, with the top body part going up above the scum level and the bottom body part extending approximately 300 mm below the max water level. For tanks no wider than 1200 mm, a T-shaped dip-pipe no smaller than the nominal diameter of the input drain may be provided.
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