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# HEX U-Bends under external pressure

## HEX U-Bends under external pressure

(OP)
thread794-256857: Heat Exchanger U-bend Under External Pressure

Hi all,

Is it really necessary to calculate the external pressure of U-Bends? Can we assume the U-bends are self-stiffened as it is joint to the straight part of tube, so the weakest part is the straight long tube?

If we use TEMA RCB-2.31 I have seen many calculator programs (AutoPIPE Vessel) showing the formula to = t1*(1 + do/4R), but I cannot understand how the t1 is given in relation to external pressure.

Or is TEMA formula using t1 only considering the U-bends under internal pressure?

Main question is how to calculate the required thickness of U-bend under external pressure using EN13445 + TEMA?

Many thanks.
LG

LPSG-Engineering Solutions
Mechanical Engineer
Portugal-Setubal

### RE: HEX U-Bends under external pressure

See Toroidal shell in “Roark's formulas for stress and strain”.

Regards

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