|
Activity
|
Categorya
|
Estimated Frequency
|
Percent Replacement Cost
|
|
1 year
|
5 years
|
10 years
|
20 years
|
<5
|
5-10
|
10-20
|
|
Boiler used to generate power
|
|
Repair superheater tie lugs
|
4
|
X
|
X
|
|
|
X
|
|
|
|
Repair superheater steam-cooled spacers
|
4X
|
|
|
|
X
|
|
|
X
|
|
Replace superheater loops
|
4
|
|
X
|
X
|
|
X
|
|
|
|
Replace superheater assemblies
|
4,7
|
|
|
X
|
X
|
|
X
|
|
|
Replace desuperheater liner assembly
|
4
|
|
|
|
X
|
X
|
|
|
|
Replace economizer assemblies
|
4,7
|
|
|
|
X
|
|
X
|
|
|
Replace generating bank tubes
|
4,6,7
|
|
|
X
|
X
|
|
X
|
|
|
Replace lower-wall tube sections
|
4,6,7
|
|
|
X
|
X
|
X
|
|
|
|
Replace lower-wall tube panels
|
4,6,7
|
|
|
|
X
|
X
|
|
|
|
Replace lower furnace
|
4,6,7
|
|
|
|
X
|
|
|
X
|
|
Repair tubular air heaters
|
4,5
|
X
|
X
|
X
|
X
|
X
|
|
|
|
Replace tubular air heaters
|
4
|
|
|
X
|
X
|
X
|
|
|
|
Repair refractory
|
4
|
X
|
|
|
|
X
|
|
|
|
Repair/replace cyclone burners
|
4,6
|
X
|
X
|
|
|
|
X
|
|
|
Clean and scaffold fire side
|
1,2,4
|
X
|
|
|
|
X
|
|
|
|
Auxiliary equipment for power boiler
|
|
Repair/rebuild coal pulverizers
|
|
|
4X
|
|
|
|
X
|
|
|
Repair/rebuild traveling grates
|
|
|
4X
|
|
X
|
|
X
|
|
|
Repair/rebuild ash-handling system
|
|
|
4X
|
X
|
X
|
|
X
|
|
|
Repair/rebuild coal-feeder systems
|
|
|
4X
|
|
|
|
X
|
|
|
Repair/rebuild boiler safety relief valves
|
1, 2
|
X
|
|
|
|
X
|
|
|
|
Remove, calibrate, and simulate boiler protective interlock devices
|
1, 2
|
X
|
|
|
|
X
|
|
|
