Waterside Care
2-12
750-392
CBEX-DE
Under no circumstances should a blowdown valve be left open. The operator should never leave until the blow-
down operation is completed and the valves are closed.
2.8 — Periodic Inspection
Insurance regulations or local laws will require a periodic inspection of the pressure vessel by an authorized
inspector. Sufficient notice is generally given to permit removal of the boiler from service and preparation for
inspection.
When shutting down the boiler, the load should be reduced gradually and the pressure vessel cooled at a rate
that avoids damaging temperature differential that can cause harmful stresses. Vessels should not normally be
drained until all pressure is relieved, to prevent uneven contraction and temperature differentials that can cause
expanded tubes to leak. Draining the unit too quickly may cause the baking of deposits that may be present on
the heating surfaces. Some heat, however, may be desirable to dry out the interior of the boiler.
If the internal inspection is being made at the request of an authorized inspector, it is advisable to ask the inspec-
tor to observe the conditions prior to cleaning or flushing of waterside surfaces.
Be certain that a supply of manhole and handhole gaskets is available, along with any other gaskets or items
needed to place the unit back into operation after inspection.
To avoid the hazard of electrical shock, we recommend the use of a low voltage flashlight during an internal inspec-
tion. Preferably, inspectors should work in pairs. Failure to follow these instructions could result in serious injury or
death.
Quick opening valve
Quick opening valve
Slow opening valve
FIGURE 2-3. Blowdown valves
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Warning
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