Hong Kong Regulations

BUILDING (STANDARDS OF SANITARY FITMENTS, PLUMBING, DRAINAGE WORKS AND LATRINES) REGULATIONS - REGULATION 25

Traps for waste fitments

(1) Every waste fitment shall be provided immediately under the fitment with a
suitable trap: Provided that a trap shall not be required-

   (a)  where the waste pipe from such fitment-

        (i)    does not exceed 1 m in length; and

        (ii)   discharges over or into a suitable trapped gully;

   (b)  in respect of lavatory basins, where the waste pipes therefrom
        discharge in the manner provided by regulation 12(2);

   (c)  in respect of a range of shower baths, where the drainage channel
        provided therefor is provided, at its lowest point, with a trap.

(2) Save as provided in paragraph (3), every trap provided for a waste fitment
shall have-

   (a)  an internal diameter of not less than 32 mm; and

   (b)  a water seal of not less than 40 mm.

(3) Where the waste pipe from a waste fitment is, under the provisions of
regulation 12(3), connected to a soil pipe, the trap provided for the
waste fitment shall-

   (a)  have an internal diameter of not less than 32 mm;

   (b)  have a water seal of not less than 80 mm; and

   (c)  be-

        (i)    adequately ventilated; or

        (ii)   constructed to prevent loss of water seal. (L.N. 294 of 1976)