Inspection and Maintenance
7-2
750-96 (revised 2010)
Model CB Packaged Boiler Manual
Inspections of this type are usually, though not necessarily, scheduled for periods of normal boiler downtime such
as an off season. This major inspection can often be used to accomplish maintenance, replacement, or repairs
that cannot easily be done at other times. This also serves as a good basis for establishing a schedule for annual,
monthly, or other periodic maintenance program.
While this inspection pertains primarily to the waterside and fireside surfaces of the pressure vessel, it provides
the operator an excellent opportunity for detailed inspection and check of all components of the boiler including
piping, valves, pumps, gaskets, refractory, etc. Comprehensive cleaning, spot painting or repainting, and the
replacement of expendable items should be planned for and taken care of during this time. Any major repairs or
replacements that may be required should also, if possible, be coordinated with this period of boiler shutdown.
Replacement spare parts, if not on hand, should be ordered sufficiently prior to shutdown.
Cleaver-Brooks boilers are designed, engineered and built to give long life and excellent service on the job. Good
operating practices and conscientious maintenance and care will obtain efficiency and economy from their opera-
tion and contribute to many years of performance.
7.2 — Fireside Cleaning
Soot and non-combustibles are effective insulators and if allowed to accumulate will reduce heat transfer to the
water and increase fuel consumption. Soot and other deposits can be very moisture absorbent and may attract
moisture to form corrosive acids which will deteriorate fireside metal.
Clean-out should be performed at regular frequent intervals depending upon load, type and quality of fuel, internal
boiler temperature, and combustion efficiency. A stack temperature thermometer, if used, can be a guide to clean-
out intervals since an accumulation of soot deposits will raise the flue gas temperature.
Tube cleaning is accomplished by opening front and rear doors. Tubes may be brushed from either end. All loose
soot and accumulations should be removed. Any soot or other deposits should be removed from the furnace and
the tube sheets.
Refer to Section 7.17 of this chapter for instructions on properly closing front and rear heads.
The vent stub and stack should be cleaned at regular intervals. Commercial firms are available to perform this
work. The stack should be inspected for damage and repaired as required.
The fireside should be thoroughly cleaned prior to any extended lay-up of the boiler. Depending upon circum-
stances, a protective coating may be required.
7.3 — Water Level Controls and Waterside of Pressure Vessel
The need to periodically check water level controls and the waterside of the pressure vessel cannot be over-
emphasized. Most instances of major boiler damage are the result of operating with low water or the use of
untreated or incorrectly teated water.
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