Hong Kong Regulations

BUILDING (STANDARDS OF SANITARY FITMENTS, PLUMBING, DRAINAGE WORKS AND LATRINES) REGULATIONS - REGULATION 50

Joints

(1) Every joint in a drain or sewer shall be made in a proper and efficient
manner so as to render the drain or sewer watertight and capable of resisting
a pressure of a head of water of-

   (a)  1.5 m; or (L.N. 294 of 1976)

   (b)  the vertical distance between the invert level of the pipe joint and
        the level of the top of the manhole immediately preceding the joint,
        whichever is the greater, and no material forming any such joint shall
        project into the interior of any pipe in such manner as to cause any
        obstruction in the drain or sewer. (L.N. 361 of 1980)

(2) The joints of cast iron socketed pipes shall be made with a gasket of hemp
or yarn, and shall be properly caulked with metallic lead or other approved
material.

(3) The joints of cast iron flanged pipes shall be made by bolting the flanges
together securely with a suitable metallic or asbestos gasket.

(4) The joints of earthenware, stone ware or concrete pipes shall be made with
a gasket of hemp or yarn, and cement mortar or other approved material.