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Minimum oxide thickness for planten superheaters tube

Minimum oxide thickness for planten superheaters tube

Minimum oxide thickness for planten superheaters tube

(OP)
Guys,

I would appreciate some education on the minimum oxide thickness required before cleaning should be carried out in planten superheater tubes in a coal power plant. The tube material is 2 1/4 Cr.

Any suggestion is highly appreciative

RE: Minimum oxide thickness for planten superheaters tube

sunshine419;
There should be no internal cleaning required for Cr-Mo superheater platen tubes. I have worked in Power Generation for over 30+ years and never had needed to either mechanically or chemically clean steam touched tube surfaces. The Cr-Mo superheater tubes, if operated within design conditions, will develop a Fe-Cr oxide layer that could reach up to 30 mils in thickness, depending on age and elevated temperature exposure. This is typical and considered normal. Removing the oxide will not achieve any improved heat transfer because the oxide will simply re-form because it is driven by metal temperature. I would worry more about external tube cleaning.

RE: Minimum oxide thickness for planten superheaters tube

Sunshine,

You aren't confusing oxide with ash or slag are you?

rmw

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