Noncircular jacketed vessel
Noncircular jacketed vessel
(OP)
Dear All!
I am trying to calculate according to ASME VIII div 1 a non-circular vessel that is jacketed with bars between the jacket and the inner shell of the vessel. The head is special, too. Appendix 13 only applies to single wall vessels, and jacketed vessel only applies to circular vessels. Since the inspector said that only calculations are permissibl, not finite element analysis, we are bumped, hence we ran over through the standard a couple of times again and again. The second issue is, that there can be a few load cases, pressure inside the inner vessel, and inside the jacket ( the same amount), atmospheric pressure outside, atmospheric pressure inside the vessel, overpressure inside the jacket and atmospheric around the outer side. Anyone could help me with this issue or link or send a sample to this exact aned specific problem?
Thanks in advance.
I am trying to calculate according to ASME VIII div 1 a non-circular vessel that is jacketed with bars between the jacket and the inner shell of the vessel. The head is special, too. Appendix 13 only applies to single wall vessels, and jacketed vessel only applies to circular vessels. Since the inspector said that only calculations are permissibl, not finite element analysis, we are bumped, hence we ran over through the standard a couple of times again and again. The second issue is, that there can be a few load cases, pressure inside the inner vessel, and inside the jacket ( the same amount), atmospheric pressure outside, atmospheric pressure inside the vessel, overpressure inside the jacket and atmospheric around the outer side. Anyone could help me with this issue or link or send a sample to this exact aned specific problem?
Thanks in advance.





RE: Noncircular jacketed vessel
Regards
r6155
RE: Noncircular jacketed vessel
You need to calculate the vessel (inner shell) per Appendix 13 using internal pressure and external pressure ( jacket internal pressure + atmospheric). Then calculate the second vessel (jacket) per appendix 13 using ( jacket internal pressure ) and external pressure (atmospheric ).
Richard.
RE: Noncircular jacketed vessel
So I would consider these cases:
internal pressure only in the main vessel
external pressure only on the vessel walls
internal pressure on the jacket (stayed)
and, if it exists, internal vacuum in the vessel with external pressure in the jacket portion, which the net effect of both of these is a more severe external pressure.
App 13 has a check for the back closure which you might be aware of.
The above is from an almost identical design I recently did.
Michael