Hong Kong Regulations

GAS SAFETY (INSTALLATION AND USE) REGULATIONS - REGULATION 22

Large consumers

Where a service pipe which has an internal diameter of not less than 50
millimetres supplies gas to-

   (a)  not less than 2 floors in non-domestic premises; or

   (b)  a floor in non-domestic premises (and irrespective of whether such
        premises have more than one floor) having areas with a separate supply
        of gas, no person shall install an incoming installation pipe to any
        of those floors or areas, as the case may be, unless-

        (i)    an isolation valve is installed in such pipe in a conspicuous
               and readily accessible position; and

        (ii)   a line diagram in permanent form is attached to such premises
               in a readily accessible position as near, so far as is
               practicable, to the primary meters indicating the position of
               all installation pipes of internal diameter of 25 millimetres
               or more, gas meters, emergency  controls, isolation valves,
               pressure test points, condensate receivers and electrical
               cross-bonding of the gas supply systems in such premises.
               (Enacted 1990)