FACTORIES AND MACHINERY (STEAM BOILER AND
UNFIRED PRESSURE VESSEL)
Regulation 14. Pressure gauge.
(1) Every pressure gauge fitted to a steam boiler shall-
(i) be connected to such steam boiler above the highest water level thereof with the dial
of the gauge in the vertical plane so that it can be read from the firing position;
(ii) be provided with a syphon pipe and a cock integral with, or adjacent to, the gauge, so
that the gauge may be shut off and removed while the steam boiler is under steam. The
handle of such cock shall be parallel to the pipe to which it is connected when the cock is
in the opening position and the shank thereof shall be marked to show the position of the
port of the plug; and
(iii) have a dial which shall-
(a) not be less than six inches in diameter; and
(b) 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 steam boiler to which it is
(c) have marked upon it in red the authorised safe working pressure of the steam
boiler to which it is fitted;
(iv) be provided with a single stop pin at the zero graduation; and
(v) accurately show the pressure within a tolerance of plus or minus two per centum of
the authorised safe working pressure of the steam boiler to which it is fitted.
(2) Notwithstanding the provisions of paragraph (1) of this regulation a globe-type screw-down
valve may be fitted to the pressure gauge of a high-duty steam boiler installed in a thermal power
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