Procedure for de-rating ASME coded vessel
Procedure for de-rating ASME coded vessel
(OP)
Hi,
A heat exchanger manufactured in 2006, but still not taken in to service. Code of construction is ASME Sec VIII Div 1 and the heat exchnager is code stamped.
Now the heat exchanger need to be derated (Without any physical change to the vessel) for lesser MAWP on channel side. Since NBIC doesn't cover de-rating, what should be the procedure followed? The equipment location is outside ASA/Canada.
1. Can de-rating be done by the end used and a new name plate be provided by himself?
2. Is the code stamp still valid after derating? My understanding is "NO", but looking for an option to have the code stamp and certification.
3. What options I have to do the de-rating, but still to have the vessel under code stamp?
Thanks you very much for the support.
A heat exchanger manufactured in 2006, but still not taken in to service. Code of construction is ASME Sec VIII Div 1 and the heat exchnager is code stamped.
Now the heat exchanger need to be derated (Without any physical change to the vessel) for lesser MAWP on channel side. Since NBIC doesn't cover de-rating, what should be the procedure followed? The equipment location is outside ASA/Canada.
1. Can de-rating be done by the end used and a new name plate be provided by himself?
2. Is the code stamp still valid after derating? My understanding is "NO", but looking for an option to have the code stamp and certification.
3. What options I have to do the de-rating, but still to have the vessel under code stamp?
Thanks you very much for the support.





RE: Procedure for de-rating ASME coded vessel
RE: Procedure for de-rating ASME coded vessel
Thanks for the feedback! The Vessel is placed in Kazaksthan, hence jurisdiction is not applicable.
In case vessel is derated by end user himself, what will happen to code stamping? What should be done to retain code stamping?
RE: Procedure for de-rating ASME coded vessel
RE: Procedure for de-rating ASME coded vessel
Thanks for the response. The ASME name plate and certificate will have different MAWP than the derated one, is it OK?
RE: Procedure for de-rating ASME coded vessel
RE: Procedure for de-rating ASME coded vessel
We are now through with the procedure to be followed.