Inspection and Maintenance
7-22
750-96 (revised 2010)
Model CB Packaged Boiler Manual
The area between the curved portion of the sheet and the flange is packed with fiberglass rope and covered with
cement to fill this void and to provide a smooth sealing area.
Replacement is not normally necessary, but if it is, completely remove all old material. Firmly caulk a layer of 1/4”
diameter rope (P/N 853-348) into this area. Tamp a second layer over the first. Apply a coating of insulating
cement pulp (P/N 872-26) over the ropes to form a smooth surface. If time permits, allow this to harden before
closing the door.
7.17.1 — Closing and Sealing
Coat the door gasket with an oil and graphite mixture. Apply a small amount of a pulp mixture consisting of
cement (P/N 872-26) and water around the inner circumference of the gasket. Press rope into this area. Use 1/2”
diameter rope (P/N 853-996) for a boiler of low pressure design. Use 1” diameter rope (P/N 853-999) for a high
pressure boiler.
After the rope is installed, the entire rope and gasket area, and the baffle area, should be liberally coated with the
pulp mixture. When the door is closed, the pulp will compress to protect the tadpole gasket and form a seal
between the refractory surface and the tube sheet.
Door bolts should be run in snug and tightened evenly to avoid cocking the door and damaging the gasket. Start
tightening at top center and alternate between the top and bottom bolts until both are tight. Do not over-tighten.
Tighten alternate bolts until the door is secured and gas tight. After the boiler is back in operation, retighten the
bolts to compensate for any expansion.
7.18 — Lubrication
7.18.1 — Electric Motors
Manufacturers of electric motors vary in their specifications for lubrication and care of motor bearings, and their
recommendations should be followed.
Ball bearing equipped motors are pre-lubricated. The length of time a bearing can run without having grease
added will depend upon many factors. The rating of the motor, type of motor enclosure, duty, atmospheric condi-
tions, humidity, and ambient temperatures are but a few of the factors involved.
Complete renewal of the grease can, when necessary, be accomplished by forcing out the old grease with the
new. Thoroughly wipe those portions of the housing around the filler and drain plugs (above and below bearings).
Remove the drain plug (bottom) and free the drain hole of any hardened grease which may have accumulated. With
the motor not running, add new grease through the filler hole until clear grease starts to come out of the drain
hole. Before replacing the drain plug, run the motor for 10 to 20 minutes to expel any excess grease. The filler
and drain plugs should be thoroughly cleaned before they are replaced.
NOTE: A boiler built for high pressure design, such as 150 psi or higher steam or for 60 psi or higher hot water, is
constructed with a flanged tube sheet that fits inside of the boiler shell and door flange.
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