Reg. 327, Reg. 328, Reg. 329
||For pressure up
to and including 35 kg/cm2, pressure gauge dial shall
be graduated in kg/cm2 from zero to twice the pressure
as nearly as may be practicable.
||For pressure exceeding
35 kg/cm2 the range of the graduation shall be from zero
to one and a half times the maximum permissible working
pressure, as nearly as may be practicable, but in no case
shall the maximum graduation on the gauge be less than
|| The scale on the
dial shall be clearly and permanent marked in kg/cm2.
||The dial of each
pressure gauge shall have to be marked upon it in red,
the maximum permissible working pressure.
||Where the gauge
is compensated for a head of water between the gauge and
the boiler connection, the amount of such compensation
shall be marked on the dial. Pressure gauge shall be calibrated
within an accuracy of ± 1%. Boiler pressure gauges
shall not be less than 150 mm in diameter.
||The travel of the
pointer of the dial gauge shall not exceed 325o C.
|All pressure gauges shall be
fitted with a syphon pipe and a cock or valve integral
with, or adjacent to, the gauge in such manner that the
gauge may be shut off and removed whilst the boiler is
|The handles of the gauge cocks
shall be parallel to the pipes in which they are located
when the cocks are open and marks shall be cut on the
shank of the cock indicating open position.