Specifications
6
FURNACE FLOOR BLANKETS
The furnace floor and the furnace wall below the mud
ring are not water backed. These surfaces must be
insulated from the intense heat in the furnace. The FD
Series boiler now employs precut, refractory ceramic
fiber (RCF) blankets to provide this insulation. They
are light weight, easy to handle and do not crack like the
poured refractory used heretofore.
The blankets must be replaced if they become water
logged or lose their thickness or shape for any other
reason, such as abuse during firetube cleaning.
BLANKET INSTALLATION
1. Confirm that the blankets are the appropriate size for
your FD boiler model using the chart opposite.
2. Unbolt the Burner Mounting Plate from the boiler
and set it aside.
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3. Remove the Burner Mounting Plate Insulation. It
may be poured-in-place refractory or precast,
lightweight RCF. In either case, it may be reused if
removed intact. Replacement, precast, lightweight
RCF Burner Mounting Door Insulation is available
from Burnham as Part No. 8203401 for Models FD7
through FD30 and as Part No. 8203402 for Models
FD38 and FD45.
4. Thoroughly clean any refractory or other insulation
out of the furnace.
5. On a flat surface, place the larger diameter 1" thick
Bottom Blanket.
6. Lay the smaller diameter 2" thick Top Blanket in the
center of the Bottom Blanket. Keep repositioning
the Top Blanket until you have equal Bottom
Blanket exposure all around the outside edge. See
dimension 'C' in the chart opposite and refer to the
illustration of blanket placement.
7. Fold the two (2) blankets in half, keeping the Top
Blanket centrally positioned on the Bottom Blanket.
8. Slide the folded blankets through the Burner
Mounting Plate opening and onto the furnace floor.
9. Unfold the blankets and position the blankets such
that the larger diameter 1" thick Bottom Blanket
curls up the wall of the furnace by at least 1½" all
around the furnace.
It is important that this curled edge of the Bottom
Blanket makes contact with the furnace wall all
around to protect the furnace wall from overheating
below the mudring. Refer to the illustration of
correctly installed blankets.
10. Reinsert the Burner Mounting Plate Insulation and
seal all gaps and cracks with ceramic caulking.
Ceramic caulking is available from Burnham in 10
ounce tubes (Part No. 9056081) and in gallon pails
(Part No. 9056982).
11. Reinstall the Burner Mounting Plate. Since neither
the blankets nor the ceramic caulk require cure
time, the boiler may be returned to service
immediately.