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Reg. 327, Reg. 328, Reg. 329
PRESSURE GAUGES

Dials

 
a) 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.
b) 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 70 kg/cm2
c) The scale on the dial shall be clearly and permanent marked in kg/cm2.
d) The dial of each pressure gauge shall have to be marked upon it in red, the maximum permissible working pressure.
e) 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.
f) The travel of the pointer of the dial gauge shall not exceed 325o C.



Reg. 328

Connections

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 under steam.



Reg. 329

Gauge Cocks

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.
 
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