Content Page: 9 Drainage and Sewerage

  • Waste Overflow

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    Where any sanitary fitting is provided with an overflow, such overflow shall, except in the case of cisterns and storage-tans, be connected close to its discharge either into the open air or to the inlets of the associated trap, and shall be so arranged that it is readily accessible for cleaning.

  • Seals In Fitting-Traps

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    (1) Except in the case of resealing-traps, the maximum depth of water-seal in all fittings-traps shall be 100 millimetres. (2) For two-pipe system installations, the minimum depth of the water-seal in all fitting-traps shall be 40 millimetres for waste-water fittings and 50 millimetres for soil-water fittings. (3) For one-pipe systems and single-stack systems, the minimum…

  • Threaded Fittings

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    All threaded fittings shall be of copper, brass, malleable cast iron or galvanized mild steel, and shall be of recessed pattern with smooth interior waterways and with threads tapped out of solid material.

  • Prohibited Fittings

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    (1) No single-or double-tee or tapped-tee branch or any fitting or connexion which offers abnormal obstruction to flow through a sewer-pipe, waste-pipe or soil-pipe shall be used. (2) The drilling and tapping of any pipe used in the sewerage system after its installation is prohibited. (3) Dead ends in waste-pipes or soil-pipes shall not be…

  • Resealing-Traps

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    All resealing-traps shall be of a type approved by the local authority.

  • Trapped Gullies

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    Trapped gullies, if of earthenware, shall comply with C.A.S. No. A16, and shall be covered with an approved grating, the bars of which shall be not more than 10 millimetres apart.

  • Grease-Traps

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    Grease-traps, if of earthenware, shall comply with C.A.S. No. A16. TABLE III

  • Tapered Pipes

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    (1) Tapered pipes complying with the requirements of C.A.S. No A16 shall be used when directly increasing in size of an earthenware sewer. (2) The diameter of the ends of such tapered pipes shall correspond to the diameter of the pipes to which they are connected, and the gradient of such larger pipe shall not…

  • Cast Iron Sewer Pipes, Traps And Associated Fittings

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    (1) All cast iron sewer-pipes, traps and associated fittings shall be sound , neatly dressed castings which are dark grey on fracture and capable of being easily drilled, tapped and files. (2) The pipes shall be true, smooth, cylindrical and straight, and their inner and outer surfaces shall be as nearly as practicable concentric. (3)…

  • Sewer-Pipes And Drain-Pipes And Associated Fittings Of Materials Other Than Cast Iron

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    (1) All swer-pipes and drain-pipes and fittings of glazed earthenware, asbestos-cement, pitch-impregnated fibre, concrete or U.P.V.C shall comply with the relevant standard specifications as follows- a) C.A.S. No A16 Earthenware drain and sewer pipes and fittings; b) S.A.B.S. 676 Reinforced concrete pressure pipes; c) C.A.S. No. A17 Concrete pipes ( non pressure) d) S.A.B.S 819…