High Design Pressure
High Design Pressure
(OP)
Is there an upper limit on the design pressure above which you can not use ASME Section VIII Div 1? If so, please provide reference.
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RE: High Design Pressure
As with most things in life, this inevitably comes down to an economic decision. That is, there are break-points where going to the other divisions of Section VIII are cheaper. It should be noted that Division 3 is intended for use "generally above 10,000 psi". See the discussion on http://www.asme.org/bpvc/bpvc8d3.shtml.
Does this answer your question?
RE: High Design Pressure
See introduction (U paragraph) for other limitation.
RE: High Design Pressure
One additional caveat that I will add - some jurisdictions may apply a hard and fast maximum pressure over and above these practical/economic limits in the Code. As, always, check with the local jurisdiction.
RE: High Design Pressure
Do you mean you design to Div 2 and build to Div 1?
(I know the process but I want your input)
genb
RE: High Design Pressure
From my perspective, you've really highlighted a serious issue with this paragraph of Div. 1. Without rules, how exactly would you design a vessel and then have it stamped to Div. 1? My take on that would be that so long as the design margins in Div. 1 are respected, especially w.r.t. the allowable stresses, then ANY methodology _should_ be acceptable for Div. 1. We do this all the time with U-2(g)-type analyses such as nozzle load evaluations.
That said, even if you _could_ do it, the better/real question is _should_ you do it. Considering that the economical break-point is probably at a lower pressure anyway, why bother? And, considering the current price of steel, I suspect that the break-point that several suthors (I can't remember references off the top of my head, though) calculated, it likely even lower now.
That's a really wishy-washy answer, but it's the best I can do so early in the morning...