TEMA A.23 TUBE LONGITUDINAL STRESS - PERIPHERY OF BUNDLE

[SyedZainAli]

Dear All
I am designing an S&T heat Exchanger of type BEM and i am having the Following Error on compress "TEMA A.23: Tube longitudinal compressive stress is excessive (Operating)."

what are the possible ways to eradicate this error
My Design conditions are
Shell side:
Design Pressure : 77 bar(g)
design Temp: 85 degree C
MDMT: -29 Degree C
MMT: -3.55 Degree C
material: carbon steel (SA 516-70)

Tube Side:
Design Pressure : 77 bar(g)
design Temp: 85 degree C
MDMT: -29 Degree C
MMT: 35.01 Degree C
material: carbon steel (SA 179 Seamless tubes, SA-266 grade 2).
See this thread as well for design calculations
I shall be very thankful to you all

http://www.eng-tips.com/viewthread.cfm?qid=374174

 

[SnTMan]

SyedZainAli , several ways to address this, singly or in combination, most of them don't always work for one reason or another.

1) Heavier tube wall thickness. This affects performance and cost.
2) Decreased unsupported tube span. Ditto above.
3) Different shell and / or tube material. Rarely feasible.
4) Reduced differential MMT's. Ditto above.
5) Add expansion joint. This nearly always works, but at added cost and complexity.

Regards,

Mike