Supplement or replace parts of ASME VIII Div. 1 calculations with Div. 2?
Supplement or replace parts of ASME VIII Div. 1 calculations with Div. 2?
(OP)
Hi guys,
I was wondering if it is permissible to supplement or replace calculations done in accordance with Div. 1 with Div. 2 (or visa-versa)? E.g., if a single part does not satisfy the requirements of Div. 1, is it possible to perform calculations for that specific component in accordance with Div 2 instead? For a specific example, I am currently working on recertification (client wants to increase working pressure) of an old (born 1960, originally designed after TEMA) heat exchanger, where one of the tubesheets does not meet the specs in Div 1, but is OK in acc. with Div. 2 (DBA).
EN 13445-3, for example, specifically states that this is permissible (replace or supplement DBF with DBA; cl. 5.4.1), however I can't find a similar statement in ASME VIII.
Cheers,
Julian
I was wondering if it is permissible to supplement or replace calculations done in accordance with Div. 1 with Div. 2 (or visa-versa)? E.g., if a single part does not satisfy the requirements of Div. 1, is it possible to perform calculations for that specific component in accordance with Div 2 instead? For a specific example, I am currently working on recertification (client wants to increase working pressure) of an old (born 1960, originally designed after TEMA) heat exchanger, where one of the tubesheets does not meet the specs in Div 1, but is OK in acc. with Div. 2 (DBA).
EN 13445-3, for example, specifically states that this is permissible (replace or supplement DBF with DBA; cl. 5.4.1), however I can't find a similar statement in ASME VIII.
Cheers,
Julian





RE: Supplement or replace parts of ASME VIII Div. 1 calculations with Div. 2?
RE: Supplement or replace parts of ASME VIII Div. 1 calculations with Div. 2?
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Supplement or replace parts of ASME VIII Div. 1 calculations with Div. 2?
RE: Supplement or replace parts of ASME VIII Div. 1 calculations with Div. 2?
BTW, that thread is over 15 year old and refers to a version of Division 2 that is pre-re-write. I would consider that thread completely obsolete.
RE: Supplement or replace parts of ASME VIII Div. 1 calculations with Div. 2?
What do you mean by "recertification"?
Regards,
MIke
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Supplement or replace parts of ASME VIII Div. 1 calculations with Div. 2?
The heat exchanger was indeed designed after TEMA as you point out. By "recertification" I should have said rerating (or uprating?) since the client wishes to increase the working pressure of the heat exhanger using ASME VIII.
RE: Supplement or replace parts of ASME VIII Div. 1 calculations with Div. 2?
Especially for older heat exchangers (as SnTMan can attest) built to TEMA, the tubesheet thickness would never meet any current ASME rules without grossly altering the allowable stress basis. What you client wants may not be achievable.
RE: Supplement or replace parts of ASME VIII Div. 1 calculations with Div. 2?
julian89, I believe that even if Div. 2 calculations are permitted and used for Div. 1 vessels, one is still bound by Div. 1 allowables. If this is not correct, I am certain that it will be pointed out :)
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand