750-368
CBEX Elite 100-1200 HP
8-25
8.18 — Refractory
If replacement is necessary, refer to Chapter 9 to order proper replacement items. Remove existing refractory.
Thoroughly clean the furnace to remove all old refractory cement or other foreign material to ensure the new liner
seats firmly against the steel. Inspect the furnace metal.
The furnace may be plain or corrugated. If the furnace is corrugated it is necessary to fill in the corrugation val-
leys under the furnace liner tile from the 4 o’clock position to the 8 o’clock position with insulating cement. The
liner tile should be fitted tightly against the crown of the corrugation.
8.18.2 — Throat Tile and Liner
The throat tile must be installed to maintain an approximate inside diameter to match the burner housing, and be
centered in the furnace. Since the thickness of the furnace metal varies with the boiler design pressure, a shim of
appropriate thickness must be used to compensate for the variance. A layer or two of insulating board or equal,
or a bed of refractory material, may be used to center the ring. The liner tile can be fitted tightly against the fur-
nace, since the finished diameter is not critical.
It is recommended that the tile be dry-fitted, match-marked, removed, and then re-installed with the proper
amount of refractory cement. Thin joints (less than 1/16”) are desirable. Generally, it will be necessary to shave
a portion from one or more tiles to obtain a fit. If a fill piece is required, cut it to fit and install the piece at the
bottom of the furnace. When installing the housing, or the tile against the housing, liberally coat the surface with
refractory cement. Remove any cement that is squeezed out.
Allow refractory to air dry as long as possible. If immediate use is required, fire intermittently at a low rate for
several hours to thoroughly dry the refractory. For detailed information, request Bulletin C10-5921 from your
local Cleaver-Brooks representative.
The area between the burner housing and throat tile requires a good seal. An improper or poor seal allows air leaks
that can cause overheating and burning of the burner housing metal. This area should be inspected semi-annually in
order to avoid damage to the equipment.
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