Inspection and Maintenance
8-32
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
8.19.2 — Rear Access Plug
Access to the first to second pass turn around area is accomplished
through the removal of the rear plug. The access plug for the 78” and
96” firetube weighs approximately 120 pounds. The 60” firetube rear
plug weighs approximately 95 pounds. Two people make the handling
of the access plug easier. When resealing the access plug area, be sure
the sealing area is clean and free of old gasket material and rust. Secure
2” blanket insulation to the inside of the plug with a 2” overlap around
the circumference of the plug refractory. Attach one wrap of 1” rope
to the inner access sealing area, and two wraps of 1/2” rope to the
outside area. Insert the plug and tighten evenly.
FIGURE 8-35.
Removing Rear Access Plug
8.19.3 — Closing and Sealing Doors
Swing the door to the closed position and run all retaining bolts in until snug.
Tighten the bolts uniformly, starting at the top center and alternating between the
top and bottom bolts until both are tight. Do not over-tighten. Tighten alternate
bolts until all are secure and the door is gas tight.
After closing the door, loosen the nut on the davit arm stud to release tension on
the davit arm. Failure to do so may result in damage to the boiler due to thermal
stresses during boiler operation.
FIGURE 8-36.
Rope Gasket on Rear Access
After the boiler is back in operation, re-tighten the door bolts to compensate for compression of the gasket or
movement of the door.
The rear access plug is made up of cast in place refractory. When removing, two boiler technicians should be on hand
to assist with removal.
NOTE:
When closing the rear door, inspect the threads on all studs and where
necessary use the correct sized die to clean the threads. Damaged stud threads can
strip the brass nuts.
Be certain that the davit arm is under tension before opening. Failure to follow these instructions could result in seri-
ous injury or death.
!
Caution
!
Warning
Summary of Contents for 4WI
Page 46: ...Burner Operation and Control 2 22 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Page 62: ...Waterside Care and Requirements 3 16 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Page 70: ...Sequence of Operation 4 8 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Page 114: ...Adjustment Procedures 6 28 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
