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Posted by Tom Stanton on March 12, 2002 at 10:10:31:
In Reply to: Tube leaks in HRSG - Any suggestions i.e. cause and/or pad welding posted by John Ray on March 11, 2002 at 08:44:45:
I don't think you have any major problems. Given the age of the boiler and the tube material, which is plain old carbon steel, 4 plugged tubes doesn't seem to bad to me. During the next shutdown, randomly RT the tubes or even scope the inside of the tubes. Check for thickness. If the thickness has diminished 20% or more think about re-tubing. Obviously, as more tubes become plugged this is an indication that re-tubing is probably your best option.
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