Hong Kong Regulations

GAS SAFETY (INSTALLATION AND USE) REGULATIONS - REGULATION 20

Testing and purging of installation pipes

(1) Where a person carries out work in relation to an installation pipe which
might affect the gastightness of any part of such pipe, he shall immediately
thereafter ensure that-

   (a)  such part is-

        (i)    tested to verify that it is gastight; and

        (ii)   examined to verify that it has been installed in accordance
               with these regulations; and

   (b)  after such testing and examination, a protective coating is applied to
        the joints of such part if such joints are likely to be exposed to any
        substance which may corrode them.

(2) Where gas is being supplied to any premises in which an installation pipe
is installed and a person carries out work in relation to such pipe, he shall
ensure that-

   (a)  immediately after complying with subregulation (1), purging is carried
        out throughout every installation pipe through which gas can then flow
        so as to remove safely all air and gas other than the gas to be
        supplied;

   (b)  immediately after such purging, if such pipe is not to be put into
        immediate use, it is sealed off at each outlet;

   (c)  if such purging has been carried out through a loosened connection,
        such connection is retested for gastightness after it has been
        retightened; and

   (d)  each seal fitted after such purging is tested for gastightness.

(3) Where gas is not being supplied to any premises in which an installation
pipe is installed at a time when work is carried out in relation to such pipe,
no person shall supply gas to the premises unless he has caused such purging
and other work as is specified in subregulation

(2) to be carried out. (Enacted 1990)