Good morning everyone,
I am designing the vessel as per ASME Sec.VIII div.2 by PVElite -2009 , Design conditions are :
Length : 2m, Dia. 1m, 2: 1 Heads
Material : SA 240 Gr347H
Design press : 6 bar,
Design temp : 535 Deg C.
The PV-Elite shows the error "Maximum Temprature exceeded when computing compressive allowable". As per my undestanding supports attachements (saddle, lug,skirt etc.) develops the compressive stresses in shell and to compare these with allowable compressive stress PVElite /code takes the limitations of temp. of 425 Deg.C for high alloy steel of Part 4, Table-4.4.1 of div2 (2007edition). But as per ASME Sec.IID Table-5A the max. temp allowed for 347H matl is 815 Deg.C. How the ASME have these two different temp. limiting conditions?
Please help on above topic.

Regards,
Prashant

Buckling and rupture are two completely different modes of failure, therefore you have different procedures for their examination. This includes different temperature limits.

In a support calculation you have compressive stress, however, the acceptance criteria given e.g. in 4.15 do no refer to table 4.4.1. I have just checked your problem with another design program and got no deficiency message.

In my understanding table 4.4.1 is given for the rules in "4.4 Design for shells under external pressure...". "4.15 Design rules for support..." is a different procedure referring to the allowable stresses in Annex 3.A which can be used up to a higher temperature. When PVElite reports an error, I think it is worth to discuss about.

Michael

By which program you checked my problem ?

Compress (Codeware)