Boiler HP Steam Line Preservation

[Pipoy04]

Good day,
I need someone who has experience in boiler (HRSG) preservation. One of our HRSG's is under refurbishment (replacement of a bundle of tubes or harps). How do we stop the corrosion to build-up on the internal surface of piping? At what percentage of oxygen that corrosion will not occur?

 

[metengr]

You can remove moisture by using desiccant and possibly several air heaters to keep the humidity levels below 20% to avoid rust.

 

[Pipoy04]

Thanks metengr!

Is there a written theory that if we keep the relative humidity below 20% and continuous hot air blowing in order to avoid rust? In this condition what is the percentage of oxygen?

 

[metengr]

It's not so much the oxygen content as the moisture. This is from experience in the power generation industry for over 40 years.