FACTORIES AND MACHINERY (STEAM BOILER AND
UNFIRED PRESSURE VESSEL)
Regulation 53. Rupture discs.
(1) Every rupture disc fitted to an unfired pressure vessel shall be of suitable metal which-
(i) is uniform in thickness;
(ii) is capable of withstanding any chemical action to which it is subjected; and
(iii) will undergo as little change in tensile strength as possible on account of temperature
(2) Where on any unfired pressure vessel a rupture disc only is fitted it shall be constructed to
burst at the authorised safe working pressure of such vessel. Such rupture disc shall be renewed
at least once in every period of two years.
(3) Where on any unfired pressure vessel a rupture disc is fitted as additional protection therefor,
it shall be constructed to burst at a pressure greater than the safety valve blowing off pressure but
not greater than one and one-half times the authorised safe working pressure of the vessel.
(4) Every rupture disc shall have particulars of its bursting pressure and temperature stamped on
the flange thereof or on a metal tab permanently attached thereto.
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