dished end thickness
dished end thickness
(OP)
dear all,
can you tell me what is thickness tolerance for dished end (claded or plain)of pressure vessel.
thanks
can you tell me what is thickness tolerance for dished end (claded or plain)of pressure vessel.
thanks
PAUL A.





RE: dished end thickness
IIRC for 2:1 heads a good rule of thumb is 1/16" for 1" and under, 1/8" up to about 2", and 1/4" over that. Use at your own risk :)
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: dished end thickness
RE: dished end thickness
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: dished end thickness
Appendix 32 of what code / specification / documents?
regards,
PAUL A.
PAUL A.
RE: dished end thickness
I'm not sure there IS a tolerance on thickness, actually.
By which, I mean that if you have a calculation showing minimum formed thickness of 0.8920" or whatever, are you allowed anything under that? And just glancing through, I didn't see a specific tolerance for underrun below that- maybe I'm overlooking it somewhere.
However, that Appendix 32 of Section VIII Div 1 of the ASME Boiler and Pressure Vessel Code relates to localized thin spots- so if you just have one little section of a head that underruns the thickness, you can evaluate it by this appendix.
On the forming allowance, heads are commonly referred to by the nominal thickness, which is the thickness of the flat plate they start with. But it's understood there will be some thinning in the process, so it's customary to specify a forming allowance or a minimum thickness after forming. So you might specify a 0.625" nominal head, and the formed thickness is actually 0.5625" minimum or something like that.
RE: dished end thickness
RE: dished end thickness
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: dished end thickness
RE: dished end thickness