longitudinal membrane stress in the tubes exceeded in floating head exchanger

[ROMEUM2]

Hi all,
I'm doing the design of a floating head exchanger with microprotol.

I have a problem because the software indicate the following warning 'Tubesheet Loading conditions T0 [test condition] : longitudinal membrane stress in the tubes exceeded'.

What can i do in order to solve the problem?????

Thanks,

 

[SnTMan]

ROMEUM2, I'm not familiar with your software, if that's what microprotol is. Can you confirm it is handling allowables and temperatures correctly?

The message does not make sense to me. For a pressure only case you would expect circumferential stress to govern, not lonitudinal, where a differential expansion usually is present.

I frankly have never seen this happen. It may be your only choice is to thicken up the tube wall.

Regards,

Mike