Hong Kong Regulations

DANGEROUS GOODS (GENERAL) REGULATIONS - REGULATION 71

Filling of cylinders containing dissolved gases

(1) No person shall fill any cylinder, or cause or permit any cylinder to be
filled, with any dissolved gas unless-

   (a)  the cylinder is completely filled with a homogeneous porous substance
        of porosity not exceeding 88 per cent; (L.N. 40 of 1973)

   (b)  without prejudice to sub-paragraph (a), if the cylinder contains a
        solvent, the solvent-

        (i)    is not of a kind capable of chemical reaction with the gas in
               the cylinder, the homogeneous porous substance or the metal of
               the cylinder; and (L.N. 386 of 1993)

        (ii)   when the cylinder is fully charged, does not completely fill
               the porosity of the homogeneous porous substance at a
               temperature of 65 degrees Celsius.

   (c)  the tare weight is stamped in a conspicuous place on the outside of
        the cylinder;

   (d)  the cylinder valve contains not more than 70 per cent of copper in its
        composition;

   (e)  the cylinder bears a conspicuous metal tag, ring or plate securely
        attached to the cylinder, otherwise than by welding or brazing,
        declaring the name of the manufacturer of the cylinder; and in
        addition thereto is labelled with the date when it was last charged,
        and the name and address of the person, company or firm by whom it was
        last charged, and the weight of gas and equivalent volume in litres at
        15.5 degrees Celsius and the maximum pressure allowed in the cylinder
        at such temperature, and the name of the gas in the cylinder.

(2) No person shall fill any cylinder, or cause or permit any cylinder to be
filled, with any dissolved gas to such an extent that, at a temperature of
15.5 degrees Celsius, the internal pressure on the cylinder exceeds 1550 kPa:
Provided that in the case of a cylinder filled for use exclusively for marine
lighting purposes the cylinder may be filled to a pressure of 2300 kPa. (L.N.
119 of 1983)