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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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