Chemical Cleaning of Once Thru Units

I guess GOOGLE does not function in your part of the world....

http://www.hsb.com/TheLocomotive/ChemicalCleaningOfBoilers.aspx

Got a few bucks ??

http://www.epri.com/abstracts/Pages/ProductAbstract.aspx?ProductId=000000000001017476

I will let you GOOGLE the last question and get YOUR VERY OWN answers !...... use the GOOGLE search terms "protective layer" boiler and magnetite !

Let us know the results.... try to tell us what you are attempting to do...!

Answer the questions on this test....what else?

Dear Sir,

Google works fine in my part of world . But m talking about Pre-operational cleaning in supercritical units.

Perhaps, VM, just perhaps.....

You should say what you mean in your original post.

It would save you and many others on this forum much time if you practiced this !

Since you were talking about pre-operational cleaning, then the only requirement is essentially the same as in any other boiler: do not use any alkaline solution unless it proven not to strip the surface chromium oxide layer. You can easily cause more corrosion problems than you will solve. On the other hand, no CIP pre-operational is likely to result in high velocity particle carry-over in the steam that will gouge your steam valves, and ruin your turbine's efficiency.

Any new unit or recently repaired unit (where there was a major repair or modification) should undergo extensive steam target blows prior to operation anyway.

It's all in the manuals, Dude. All in the manuals.