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Thermal Bowing Insulated Steam Line

Thermal Bowing Insulated Steam Line

(OP)
Hi,

The client has asked for a thermal bowing analysis for a thin walled insulated steam line. The client wants to investigate if thermal bowing occurs and if it is occurs what stress are developed in the pipe when the line is warmed up during the winter time, when the ambient temperatures can be minus 30- 40 Celsius degrees.

Is any thermal analysis or piping stress analysis methods which can be used to investigate this thermal bowing? Any suggestions are appreciated.

One Point

RE: Thermal Bowing Insulated Steam Line

Caesar II handles thermal bowing. It is typically used to analyse stresses in large diameter lines, part filled with cryogenic liquid.

It should be simple to apply to your needs, although I am not sure how a significant temperature differential would occur in your pipe.

RE: Thermal Bowing Insulated Steam Line

Boghi,

I had this same type of inquiry from a client last year. See the link below. It might not help you directly, but it might jog your brain into a new idea of path or discovery. I was never able to find anything on the stresses that develop when a line is bowed. When a straight pipe at any temperature above ambient is modeled in Caesar II, the pipe will only grow straight, away from it's anchor point. Stresses are not calculated in expansion because there is no bend to calculate an expansion at. The pipe cannot expand when anchored on both sides. In my example, I was simply able to calculate a theoretical bowing distance and submit that to the client.

C2it,

Could you please provide more information on how Caesar II is able to tackle this problem?

Thanks,
Dmitriy

RE: Thermal Bowing Insulated Steam Line

Caesar II considers the thermal differential top to bottom of a pipe which is assumed to be horizontal. Elemental bending stress induced by the dT value is included in system thermal stresses.

I recommend a direct approach to Intergraph (ex-Coade) if you need further information.

RE: Thermal Bowing Insulated Steam Line

dso88,
what link?

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