Inspection and Maintenance
8-28
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
FIGURE 8-32. Throat Tile and Furnace Liner
8.18.1 — 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. Wash coating should be done as soon as cracks are detected.
Should segments of the liner burn away or fall out, replace the entire refractory piece. 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 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 valleys
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.
The area between the burner housing and the 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. The area should be inspected semi-annually. Con-
tact your local Cleaver-Brooks representative.
!
Caution
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