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Reg. 390 p
Suspended boilers-Freedom of expansion

Where boilers are suspended the supports and setting shall be carefully examined specially at points where the boiler structure comes near the setting walls or floor. Often accumulation of ash and soot will blind the boiler structure at such points and produce excessive strains on the structure owing to the expansion of the parts under operating conditions.


Reg. 390 q

Safety Valves

As the safety valves are the most important attachments on the boiler, they shall be inspected with the utmost caution. There should be no accumulations of rust, scale, or other foreign substances located in the casings so as to interfere with the free operation of the valves. The setting and freedom of the safety valves should be tested preferably by raising the steam pressure to the blow-in-off point, or if this cannot be done, the valves shall be tested by means of the try levers to ascertain if they are free. Where the steam discharged from a safety valve is led through a pipe the Inspector shall determine at the time the valve is operating whether or not the drain, opening in the discharge pipe is free and in accordance with the Regulations.

If the Inspector deems it necessary, in order to determine the freedom of discharge from a safety valve, the discharge connections should be removed. Under no circumstances should a stop valve be permitted between a boiler and its safety valve.


Reg. 390 r

Steam Gauges

The steam gauges on all boilers shall be removed and the Inspector shall test them and compare their readings with a standard test gauge. The readings of the steam gauges shall be observed and compared when making an inspection with steam on the boiler, where several boilers are in service connected to a common steam main. The location of the steam gauges shall be noted to see whether or not it is exposed to high temperature either externally, as would be the case if placed close to the smoke flue or other high heated part of the boiler or setting, or exposed to heat internally due to lack of protection of the gauge spring with a proper syphon or trap to prevent steam from coming in contact with the spring. The Inspector shall see that provisions are made for blowing out the pipe leading to the steam gauge.
 
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