Repairing a National Board Registered heat exchanger using a non-R-Stamp company

[jeevesme]

We have an ASME built and NB registered Heat Exchanger that we need to put new tubes in. It has seal-welded 2205 tubes in it and we would like to put 316L tubes in it (because of time constraints) using a non-R-Stamp shop (because of time constraints). This unit operates below 15psig so the Illinois BPV law does not apply.

1. Since this has a NB Number, we still have to have an R-Stamp company re-tube it, correct?
2. If we have a company without an R-Stamp re-tube it(and the answer to the above question is yes), it is no longer compliant with NB-23, correct?
3. If the answer the #2 is yes:

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Do we need to document somewhere that the unit was not repaired in compliance with NB-23?

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How would this affect future repairs?

 

[FormerAIS]

Since you're in Illinois, what does the Chief Boiler Inspector say on the matter? That would be your first call, not here. Specifically because Illinois keeps a record of each ASME boiler and vessel. They will probably say you can rip the nameplate off and de-classify it as an ASME vessel.

Also, if you get an answer from the Chief Inspector, I would contact your Pressure Vessel Insurance.

Separately from what they each say. A R-stamp company required to maintain the ASME pedigree of the vessel. Keeping it an ASME vessel maintains re-sell value.

Quality is not an act, it is a habit - Aristotle

 

[oknow]

Excellent recommendations from former AIS.I might add any conversations with Jurisdiction or Insurance Co. get in writing and file away.
My guess is this is a cost issue. Do it the correct way.

 

[jeevesme]

The Chief, unfortunately, was not much help. He basically just said that since it operates under 15 psig, Illinois doesn't care. We ended up plugging tubes and ordering a new heat exchanger. FYI, Material availability was the issue, not cost.