Hong Kong Regulations

GAS SAFETY (GAS SUPPLY) REGULATIONS - REGULATION 23

Purging, etc. of gas pipes

(1) No person shall commission, recommission or decommission any gas pipe
except by a purging procedure which ensures, so far as is reasonably
practicable, that-

   (a)  the persons carrying out such purging, any persons working in the
        vicinity of the place where such purging is being carried out and
        members of the public are protected against any dangers which may
        arise from such purging;

   (b)  the risk of an explosive mixture of gas and air arising in such pipe
        is minimized; and

   (c)  in the case of the commissioning or recommissioning of such pipe, no
        air or inert gas remains in such pipe after such purging which may
        cause an unsafe situation to arise in respect of the continuity of the
        gas supplied downstream of such pipe.

(2) Where a gas pipe through which gas is supplied has the pressure of such
gas reduced to zero, no person shall-

   (a)  carry out any work on such pipe; or

   (b)  recommission such pipe, unless such pipe has been purged of such gas.

(3) For the purposes of this regulation, "gas pipe" (氣體喉管) includes
any gas fitting-

   (a)  used in connection with a gas pipe; and

   (b)  through which gas may flow. (Enacted 1990)

"gas pipe" (氣體喉管)