Acceptance of general corrosion
Acceptance of general corrosion
(OP)
I have problems with the presence of some points of general corrosion in the Air-Intake conduit of a gas turbine.
The material is 304.
Is there an international standard or norm or something like this that regulate the presence of this points of general corrosion? i mean something like a "density" of points per m2?
Thanks
The material is 304.
Is there an international standard or norm or something like this that regulate the presence of this points of general corrosion? i mean something like a "density" of points per m2?
Thanks





RE: Acceptance of general corrosion
What I believe you are asking is for some type of condition assessment method to evaluate the extent of pitting corrosion in the air intake duct work, correct?
RE: Acceptance of general corrosion
If you are having pitting on an intake duct I suggest that you look at it from an integrity point of view. Will you have leaks or will you be at risk of structural failure.
Sometimes because of the way that the unit was fabricated the pitting will be concentrated near supports and you risk having it collapse.
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Plymouth Tube
RE: Acceptance of general corrosion
Is it localized to a certain section or portion of the duct, or uniform around the entire periphery of the duct?
Do you have inlet chilling, evap cooling, fogging or deicing or other contributors to the presence of corrosive agents?
rmw
RE: Acceptance of general corrosion
RE: Acceptance of general corrosion
Now we are brushing and pickling.
But i think it's not crevice corrosion. It seems to be general corrosion due to atmospheric attack.
RE: Acceptance of general corrosion
RE: Acceptance of general corrosion
You say that you are brushing? Use abrasive flap wheels and make sure that they are new.
And also make sure that you rinse the pickling paste off very well.
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Plymouth Tube
RE: Acceptance of general corrosion
For the repair, you may do the acid cleaning per ASTM A380 and repair welding as well as making drain holes (diameter 1/4") at the water pocket/stagnant areas.
Thomas Eun