Chapter 8 — Inspection and Maintenance
Part No. 750-184 8-23
A good seal between the rear door 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.
When opening the door, either for routine maintenance or for an annual
inspection, do not do so when the boiler or the door is hot. The refractory
will hold its temperature for some time and exposure to ambient temperature
or rapid cooling may cause refractory cracking and/or harm to the boiler and
door metal.
Be certain that the davit arm is under tension before
opening. Failure to follow these instructions can result in
serious personal injury or death.
Before loosening the door bolts, tighten the nut on the davit stud to ensure
tension on the davit arm. Putting the davit arm under tension will help
eliminate sagging, and will facilitate opening and closing.
The opened door should be supported by blocking or jacking to eliminate
possible deformation of the door.
Figure 8-3 Rear door seal
CB-OS ONLY
CB-LE ONLY
1. Tadpole gasket
2. Rope 1-1/2” dia.
3. Blanket insulation 1/2” x 2”
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