Inspection and Maintenance
7-20
750-96 (revised 2010)
Model CB Packaged Boiler Manual
• Check condition of insulating cement protecting the tadpole gasket.
• Check the horizontal baffle tile for large cracks, breaks, chipped corners, etc.
• Check for cracks in castable refractory at ends of baffle tile.
• Check tightness of door bolts.
• See that the air line to the sight tube is clear and connections are tight. If necessary, blow clear with an air
hose.
It is normal for refractories exposed to hot gases to develop thin “hairline” cracks. This by no means indicates
improper design or workmanship. Since refractory materials expand and contract to some degree with changes in
temperature, they should be expected to show minor cracks due to contraction when examined at low tempera-
ture. Cracks up to approximately 1/8” across may be expected to close at high temperature. If there are any
cracks that are relatively large (1/8” to 1/4” in width), clean them and fill with high temperature bonding mortar.
Any gap that may show between the castable refractory and the baffle tile should be filled in a similar fashion.
After opening the rear door, clean the flange with a scraper or wire brush. Clean the surface of the refractory care-
fully with a fiber brush to avoid damaging the surface. Clean the mating surfaces of the baffle tile and the boiler
shell. Remove all dried out sealing material. Wash-coat the lower half of the rear door refractory prior to closing.
The upper half of the door contains a lightweight insulating material similar to that used in the inner door. A thin
wash-coat mixture applied gently with a brush is helpful in maintaining a hard surface.
If the baffle tile or the refractory requires replacement, contact your local Cleaver-Brooks representative.
7.16.4 — Front Inner Door
The front inner door is lined with a lightweight castable insulation material. Thin “hairline” cracks may develop after
a period of time. However, these will generally tend to close due to expansion when the boiler is fired.
A thin wash-coat mixture applied gently with a brush is helpful in maintaining a hard surface.
Minor repairs can be accomplished by enlarging or cutting out affected areas, making certain that they are clean
and then patching as required. Should the entire installation require replacement, remove existing material and
clean to bare metal. Inspect the retaining pins and replace if necessary. Reinforcing wire suitably attached may
also be used. The recommended insulation is known as Vee Block Mix and is available in 50 lb. bags (CB part num-
ber 872-162).
Mix the material with water to a trowling consistency. Mixing should be completely uniform with no portion either
wetter or drier than another. Trowel this mixture into any areas that are being patched. If replacing complete insu-
lation, begin at the bottom of the door and apply the mixture to a thickness equal to the protecting shroud. With a
trowel apply horizontally back and forth across the door in layers until the required thickness is reached.
Allow to air dry as long as possible. If immediate use of the boiler is required, fire as slowly as possible to avoid
rapid drying of the material.
Courtesy of: C3 Surplus LLC
Surplus Industrial Superstore
305-428-2777
https://www.c3surplus.com
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