Inspection and Maintenance
7-18
750-96 (revised 2010)
Model CB Packaged Boiler Manual
If the motor was replaced or if the motor leads were disconnected, make sure that pump rotation is proper before
starting operation. The air pump should rotate in a clockwise direction when viewed from the drive shaft end.
Keep the motor and other components free from dust and dirt to prevent overheating and damage. Motor lubrica-
tion should follow manufacturer’s recommendations.
7.16 — Refractory
The boiler is shipped with a completely installed refractory. This consists of the rear head, the inner door, and the
furnace liner. Normal maintenance requires little time and expense, and prolongs the operating life of the refrac-
tory.
Preventive maintenance through periodic inspection will keep the operator informed of the condition of the refrac-
tory and will guard against unexpected and unwanted downtime and major repairs.
Frequent wash-coating of refractory surfaces is recommended. High temperature bonding air-dry mortar, diluted
with water to the consistency of light cream, is used for this purpose. Recoating intervals will vary with operating
loads and are best determined by the operator when the heads are opened for inspection.
7.16.1 — Furnace Liner
Maintenance consists of occasional wash-coating of the entire liner. Face all joints or cracks by applying high tem-
perature bonding mortar with a trowel or fingertips. This should be done as soon as cracks are detected.
Should segments of the liner burn away or fall out, replace the entire refractory. Any refractory that may break out
should be removed as soon as detected so that it will not fuse to the bottom of the furnace and obstruct the
flame.
If replacement is necessary, refer to Chapter 8 and order proper replacement materials. Remove the existing
refractory. Thoroughly clean the furnace to remove all old refractory cement or other foreign material to insure
new liner seating firmly to the steel. Inspect the furnace metal for soundness.
Depending upon the design pressure of the boiler, the furnace may be of the corrugated type. Although it is not
necessary to fill in the depressions, for convenience of installation some or all of the corrugation valleys may be
filled with insulating cement. The liner tile should be fitted tightly against the crown of the corrugations.
7.16.2 — Liner Installation
The segments are normally replaced through the front opening in the furnace and it is suggested that the rear
most course be installed first, the middle next, and finally the throat tile at the entrance of the furnace. When the
three courses are installed, the entire liner should be pulled or pushed forward so that it is flush with the flange
ring at the mouth of the furnace.
It is recommended that the tile be dry fitted, match marked, removed, and then reinstalled with the proper amount
of refractory cement. Thin joints are desirable. Generally, it will be necessary to shave a portion from one or more
tile to obtain a fit. If a fill piece is required, cut it to fit and install this piece at the bottom of the furnace.
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