TABLE E-3 Pulp and Paper Industry: Repair and Replacement Activities

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

 

 



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