CleaverBrooks CBLE, Operation And Maintenance Manual

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750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual 8-29
8.21 — Head Inspection and Maintenance
3.
Mix the vee block to a mortar-like consistency (per manufacturer’s instructions) and pack the front valleys of the
furnace corrugations with the mixture, flush with the furnace I.D. up to 3 o’clock and 9 o’clock from the center-
line of the furnace. Install both pieces of cerafelt to insulate the tile from the corrugation and begin bottom half
of first row of tiles as shown on “Detail C.”
4.
To begin top half of arch bricks and tiles, measure off upper half of furnace arch bricks and tiles with templates,
mark with chalk, and determine if a cut brick or cut tile is needed (see “Detail B”). If a cut brick is required,
locate it below the 2 o’clock and 10 o’clock positions. If the brick is cut, the angle of the cut surface should be
the same as the original brick. If cut brick or tile measures less than 1/2 full width, cut two pieces.
5.
Install bricking tool as shown on “Detail A” and continue installing upper half by alternating one arch brick and
one corresponding tile.
6.
For the last two rows of tiles, pack all remaining valleys of furnace corrugations (measure 36” from inside sur-
face of arch bricks) with vee block mixture flush with furnace I.D. up to the 3 o’clock and 9 o’clock centerline of
the furnace.
7.
After joint cement hardens (approximately 2 hours), remove bricking tool, wooden tile supports, and discard
cerafelt shims.
8.21 — Head Inspection and Maintenance
Disconnect and lock out electrical power and fuel to the boiler before opening either the front or
rear head. Failure to follow these instructions can result in electrical shock and serious personal
injury or death.
A good seal between the heads and the pressure vessel is necessary to prevent leakage of combustion gases, loss of
heat, and to aid in obtaining operating efficiency. Leaks can also cause hot spots that can lead to premature refractory
failure and/or damage to the door metal.
INSTALLATION NOTES:
1.
No cerafelt, cut bricks, or cut tiles to be installed in the upper 120º section of the furnace. See “Detail A” and
“Detail B.”
2.
Pack all bricks and tiles tightly with mallet and remove excess cement: 1/16” typical joint, 1/8” maximum.
3.
No cement applied between cerafelt and bricks, tiles, or furnace. Only applied between bricks and tiles.
4.
Do not cover furnace weld seam with cerafelt. cut and space to suit as shown on “Detail B” and “Detail C.”
5.
Support upper tiles with wooden boards to suit assembly. Two boards per tile as shown on “Detail C.” (For 96”
diameter, use 3/4” x 1-1/2” x 38”. For 78” diameter, use 3/4” x 1-1/2” x 28”.)
6.
To insure tight fit and maximum I.S. of arch bricks, cut a 3” square piece of scrap cerafelt and use as a shim between
bricking tool O.D. and I.D. of upper half of bricks.
7.
Stagger cemented joints (seams) between all arch bricks and tiles.
8.
After each half course of bricks or tiles installed, clean up excessive cement and fill open joint areas where neces-
sary.
9.
For 78” diameter boilers, use bricking tool #98-d-280 and fasten with two 1/2”-13 nuts. For 96” boilers, use brick-
ing tool #98-d-279 and fasten with two 5/8”-11 nuts.
! Warning