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Pipeline heating before backfilling

Pipeline heating before backfilling

Pipeline heating before backfilling

(OP)
I need to install thick pipeline in very cold environment (-30C). Longitudinal stress due to thermal expansion (working temperature is 80 degree) is making the overall stress analysis non passing. Therefore we ere thinking to heat the pipeline after laying and before backfilling to reduce the thermal expansion in restrained condition and decrease the longitudinal stress.
Did anybody experience something like this?

RE: Pipeline heating before backfilling

It is pretty standard stuff in the Canadian bitumen fields where they use hot water flow over a period of time. It has also been used on trace heated pipework to pre extend the pipe by using the heating system before final closure and backfilling.

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RE: Pipeline heating before backfilling

I think you need expansion loops to allow movement as the metal temperature changes.

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