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Allowable Longitudinal Compressive Stress - Heat Exchanger Design

Allowable Longitudinal Compressive Stress - Heat Exchanger Design

(OP)
TEMA design has provision to check the actual longitudinal stresses in the shell and tube (periphery of bundle) against allowable stresses (both tensile and compressive).
The code provides a comprehensive guide to determine the allowable longitudinal compressive stress for tubes but mentions only briefly of allowable compressive stress for shell according to the Code (which in this instance,  I presume refers to ASME V111.).  I have following queries:

1.ASME V111 (UG 28) determines the allowale compressive  vide computation of A factor and reference to charts in Appendix 5. Does ASME V111 allow provision to determine allowable compressive stress by calculation only ?  I have seen some exchanger design by Japanese manufactureres using a formula for calculating the stress viz.
0.3Et/[D(1-0.004E/Y)] where E is shell elastic modulus,  t is shell thickness,  D is mean shell diameter and Y is the Yield stress for shell material.

2. It appears to me that the ASME determination of the allowable longitudinal compressive stress is higher than that determined per TEMA's formula?  Why is that?
Replies continue below

RE: Allowable Longitudinal Compressive Stress - Heat Exchanger Design

You need a new Sec VIII. See Part UHX

RE: Allowable Longitudinal Compressive Stress - Heat Exchanger Design

The ASME VIII Code has always used the charts for determination of allowable compressive stress.  Although the charts are based on computational methods, the equations have never been presented in the Code.

The equation you indicated for the Japanese Code does not appear to be same as ASME's Basis.  One difference in the result may the the fact that the ASME Codes uses a factor of safety of four.  I do not know what the Japanese Code uses.

Steve Braune
Tank Industry Consultants
www.tankindustry.com

RE: Allowable Longitudinal Compressive Stress - Heat Exchanger Design

(OP)
Thanks guys.

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