Hong Kong Regulations

BUILDING (STANDARDS OF SANITARY FITMENTS, PLUMBING, DRAINAGE WORKS AND LATRINES) REGULATIONS - REGULATION 44

Materials for drains, etc.

(1) Covered drains (except covered drains provided for the carriage of
sub-soil water) and covered sewers shall be made with good sound pipes of
glazed earthenware, stone ware, concrete, cast iron or other approved
material.

(2) Drains and sewers above the ground shall be laid with cast iron pipes or
other approved materials. (L.N. 361 of 1980)

(3) All pipes used in the construction of any drain or sewer shall-

   (a)  be of true bore;

   (b)  have smooth internal surfaces; and

   (c)  be impervious.

(4) Cast iron sewage pipes shall be protected against rust and corrosion by a
suitable asphaltic coating.

(5) Earthenware, stone ware and concrete pipes shall-

   (a)  in the case of pipes with a diameter not exceeding 150 mm, have a
        thickness equal to not less than one-ninth of the diameter of the
        pipe; and

   (b)  in the case of pipes with a diameter exceeding 150 mm, have a
        thickness equal to not less than one-twelfth of the diameter of the
        pipe. (L.N. 294 of 1976)