Tubesheet Calcs
Tubesheet Calcs
(OP)
Hello All,
We are submitting a shell and tube heat exchanger design for PED for import into the EU. As such, it is designed to ASME Sect VIII Div 1, and submitted to a Notified Body for review. The tube pattern is such that the tubesheets do not fall under the scope of UHX (large untubed areas and non-circular pattern).... therefore, we fall to U-2(g). Our first fall back would be to submit TEMA calcs, but the reviewer correctly says we cannot submit TEMA calcs either because RCB 7-11(3) exempts these tubesheets. So... short of an FEA, what can we submit to justify these tubesheets? Does anyone have calcs that cover tubesheets with untubed areas?
We are submitting a shell and tube heat exchanger design for PED for import into the EU. As such, it is designed to ASME Sect VIII Div 1, and submitted to a Notified Body for review. The tube pattern is such that the tubesheets do not fall under the scope of UHX (large untubed areas and non-circular pattern).... therefore, we fall to U-2(g). Our first fall back would be to submit TEMA calcs, but the reviewer correctly says we cannot submit TEMA calcs either because RCB 7-11(3) exempts these tubesheets. So... short of an FEA, what can we submit to justify these tubesheets? Does anyone have calcs that cover tubesheets with untubed areas?





RE: Tubesheet Calcs
However, you have to satisfy your reviewer, no way around that. Can the reviewer suggest other analysis perhaps? FEA may be your only option.
Regards,
Mike
RE: Tubesheet Calcs
RE: Tubesheet Calcs
Regards,
Mike
RE: Tubesheet Calcs
RE: Tubesheet Calcs
Try a search on Google and find = francis OSWEILLER.
see also attachment.
This defines the assumptions and backround of UHX
This gentlman is a a " gourou" in tubular heat exchanger design and he works for ASME + EN + Codap
his papers are the basis for UHX design and also for EN
In his papers he defines analitically the boundaries between th former TEMA design and UHX ( based on the stiffness factor Xa..)
Again dowload his free paper and you probably find a way I hope