nozzle local stress analysis by Annex G of PD5500 in PvElite
nozzle local stress analysis by Annex G of PD5500 in PvElite
(OP)
hi every one. i am working on designing of a PD5500 - 2012 pressure vessel by PvElite 2014-sp2 software. after opening Nozzle input/Analysis menu, i select in calculation method bar, PD:5500 item. now my question is:
if the nozzles on vessel doesn't have reinforcing pads (integrated type):
i. should i consider membrane stress intensity factor alone for nozzle (1.2 f) or i must check only membrane+bending stresses (2.25 f) for nozzle local stress analysis by PD5500?
should i check the Print membrane stress at nozzle Edge box for analysis of nozzle by Annex G of PD or not?
Link
thanks in advance for your help.
if the nozzles on vessel doesn't have reinforcing pads (integrated type):
i. should i consider membrane stress intensity factor alone for nozzle (1.2 f) or i must check only membrane+bending stresses (2.25 f) for nozzle local stress analysis by PD5500?
should i check the Print membrane stress at nozzle Edge box for analysis of nozzle by Annex G of PD or not?
Link
thanks in advance for your help.





RE: nozzle local stress analysis by Annex G of PD5500 in PvElite
or i must check only membrane+bending stresses (2.25 f) for nozzle local stress analysis by PD5500 : YES
Should i check the Print membrane stress at nozzle Edge box for analysis of nozzle by Annex G of PD or not : YES
RE: nozzle local stress analysis by Annex G of PD5500 in PvElite
A.3.3.2 paragraph in PD 5500 - 2012 says:
A.3.3.2 Nozzles and openings subject to pressure and externally applied loads
For these limits to apply the nozzle or opening has to be reinforced in
accordance with 3.5.4.
The maximum stress intensity adjacent to the nozzle or opening due to internal
pressure shall be obtained from G.2.5 in the case of spherical shells, or from
G.2.3.6 for cylindrical shells.
Under the design combined load the stress intensity due to the sum of
membrane and bending stresses shall not exceed 2.25f.
our consultant based on above paragraph and example W.3.2.3 of pd 5500, interprets that there is no need for considering membrane stress intensity (1.2f) separately. so based on your answer, his interpretation is incorrect. i am right?
thanks in advance for your help.
RE: nozzle local stress analysis by Annex G of PD5500 in PvElite
RE: nozzle local stress analysis by Annex G of PD5500 in PvElite
I think that if you did voluntarily wish to calculate the local membrane stress (1.2f) then the local membrane pressure stress could be calulated using the method in ASME VIII-1 Appendix 1-10.
Of course to remain compliant with PD5500 you would still need to use the crotch corner stress and allowable stress of 2.25f for the membrane+bending assessment.
RE: nozzle local stress analysis by Annex G of PD5500 in PvElite