Nozzle to shell diameter ratio
Nozzle to shell diameter ratio
(OP)
Hello all,
Can someone please advise what calculation procedure to use for evaluating stresses at nozzle attachments larger than half the vessel diameter?
There is an existing heat exchanger that was designed to ASME VIII Div 1 in the fifties. It will experience uplift in a seismic event thus causing dynamic loads on the nozzles.
The shell is made of DN500, XS SMLS pipe (508mm OD, 12.7mm thk) and the product outlet nozzle is DN250, XS SMLS pipe (273mm OD, 12.7mm thk).
My understanding is that the given D/d ratio is outside the scope of PD5500 and WRC107. Can you please recommend an alternative procedure?
The nozzle loads (both static and dynamic) have been established from an AutoPIPE stress analysis.
Many thanks
Can someone please advise what calculation procedure to use for evaluating stresses at nozzle attachments larger than half the vessel diameter?
There is an existing heat exchanger that was designed to ASME VIII Div 1 in the fifties. It will experience uplift in a seismic event thus causing dynamic loads on the nozzles.
The shell is made of DN500, XS SMLS pipe (508mm OD, 12.7mm thk) and the product outlet nozzle is DN250, XS SMLS pipe (273mm OD, 12.7mm thk).
My understanding is that the given D/d ratio is outside the scope of PD5500 and WRC107. Can you please recommend an alternative procedure?
The nozzle loads (both static and dynamic) have been established from an AutoPIPE stress analysis.
Many thanks





RE: Nozzle to shell diameter ratio
RE: Nozzle to shell diameter ratio
Thanks for your input. I just want to know what method caters best for large round attachments. If PD5500, Bijlaard or WRC 107/297 don't cover d/D>0.5 then what does? FEA is not an option as we don't have any in-house FEA software. Have to do it the good old manual way.
RE: Nozzle to shell diameter ratio
Did WRC-107 even exist in the 1950's?
Edward L. Klein
Pipe Stress Engineer
Houston, Texas
"All the world is a Spring"
All opinions expressed here are my own and not my company's.
RE: Nozzle to shell diameter ratio