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Reg. 390
Procedure for inspection of installed boilers
General Instruction
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It is essential to
have every part of the boiler, that is accessible, open
and properly prepared for examination, internally and
externally. All boilers have openings through which an
examination may be made and which for operation are closed;
all such parts shall be opened whether for access to water
surfaces, or heater surfaces. In cooling a boiler down
for inspection or repairs, the water should not be withdrawn
until the setting is sufficiently cooled to avoid damage
to the boiler and when possible allowed to cool down naturally.
It is not necessary, in order to comply with ordinary
prudence, to remove insulation material, masonry, or fixed
parts of the boiler, unless defects or deterioration peculiar
to certain types or inaccessible parts of boilers are
suspected and where there is moisture or vapor showing
through the covering should be removed at once and a complete
investigation made. Particular attention should be paid
to the external parts of boilers in the way of seating
blocks, especially when the situation is damp. Saddle
tanks and engine fittings of locomotive type boilers should
be removed to facilitate the inspection of the parts underneath
at the first inspection, and at any reasonable period
afterwards if the Inspector cannot otherwise satisfy himself
as to the condition of those parts. Upon sufficient visible
evidence or suspicion due to age or other causes, every
effort shall be made to discover the true condition, even
to the removal of insulating material, masonry or fixed
parts of a boiler. Sometimes drilling or cutting away
of parts is justifiable and necessary to positively determine
this condition.
The Inspector should, whenever the size permits, go inside
it and make a thorough inspection of all its internal
parts. Before doing so, he should of course, satisfy himself
that proper provision has been made for disconnecting
the boiler from any other boiler under steam. Should he
find that proper provision for disconnection has not been
made or that the boiler has not been properly cleaned
or scaled, or that is unreasonably hot, he should decline
to proceed with the inspection and should report the facts
to the Chief Inspector for orders. When a boiler is of
such a size or its construction is such that the Inspector
cannot go inside it, there should be sufficient sight
holes or hand-holes provided to enable him to see the
principal internal parts; if any important part of a boiler
is so constructed that the Inspector cannot examine it,
he should report the facts to the Chief Inspector for
orders.
In the case of forced circulation and forced flow boilers
which are not accessible to close visual inspection, the
Inspector should, besides thorough examination, ensure
by the flow of water that proper circulation is maintained
through all sections of the water circuits. |
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