FACTORIES AND MACHINERY (STEAM BOILER AND
UNFIRED PRESSURE VESSEL)
Regulation 54. Pressure gauge.
(1) Every pressure gauge fitted to an unfired pressure vessel shall-
(i) not be less than three inches in diameter across the dial:
Provided that where the external shell diameter of the unfired pressure vessel is less than
twelve inches and the pressure in such vessel is not more than one hundred and fifty
pounds per square inch, such gauge shall not be less than two inches in diameter;
(ii) be graduated from zero to not less than one and one-third times and not more than
twice the authorised safe working pressure of the pressure vessel to which it is fitted;
(iii) have the authorised safe working pressure clearly marked in red on the dial;
(iv) be provided with a single stop pin at the lowest pressure reading; and
(v) accurately show the pressure within a tolerance of plus or minus two per centum of
the authorised safe working pressure of the pressure vessel to which it is attached.
(2) Where a pressure gauge cock is fitted, the handle thereof shall be parallel with the bore of the
cock when the cock is open.
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