BMK 5000-6000 Boiler OPERATION-SERVICE-MAINTENANCE GUIDE
SECTION 6 – MAINTENANCE
Page
50
of
136
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0124_0A
05/03/2017
Ph.: 800-526-0288
GF-208
REAR REFRACTORY REPLACEMENT Instructions
CAUTION!
The rear plate weighs approximately 40 pounds. It is therefore recommended that 2 people
be used when removing the plate.
9. Remove the top nut from the plate and remove it from the unit.
10. Optionally, you can thread 2 small nipples into the rear plate to act as handles, which will
ease removal and reinstallation.
11. Refer to Figure 4-8 and note the position of the rear refractory. Prior to refractory removal,
mark as necessary using a permanent marker or tape.
12. Gently pull on the two opposing metal tabs located on the outer edge of the fiber blanket,
then alternately pull on the other two opposing tabs. Continue this process until the fiber
refractory package can be removed from the combustion chamber. Be careful not to drop
or damage the refractory.
13. Place the fiber insulation package, metal face down, in a safe location to avoid damage.
14. The combustion chamber can now be viewed and inspected with a full view of the Burner
assembly and rear tubesheet. A borescope can be used to inspect the front tubesheet as
well as under the expansion joints.
15. Following inspection, reinstall the components in the reverse order in which they were
removed.
IMPORTANT!
If the rear refractory (P/N
83027
) was damaged during removal, it should be replaced with a
new part. If rear refractory replacement is required, a 2 hour burn-in period at a 30% fire
rate must be performed to drive off organic binders. These organic binders are not
hazardous materials, however they may emit an odor similar to burning wood.
16. Tighten the bolts on the rear plate using an alternating pattern to ensure a uniform seal.
Torque bolts to approximately
20 ft-lbs
.
17. To avoid exhaust leaks, ensure that a uniform seal is established when reconnecting the
flue system to the boiler.
(Continued)
