Dear Sirs,

I have read most of threads about temperature but I couldn't find clear answer for my question. The question is:
How can we specify ambient(install) temperature for above and underground(buried) piping or pipeline from site condition document for my analysis?

It should be mentioned that site condition document specifies maximum/minimum Absolute Ambient Temperature, Average Maximum/minimum Absolute Ambient Temperature, Maximum/minimum Average Soil Temperature.

For instance, consider a pipeline with below condition

Maximum operating temperature= 35 deg C
Maximum/minimum Absolute Ambient Temperature= 55/-3 Deg C
Average Maximum/minimum Absolute Ambient Temperature= 50/3 Deg C
Maximum/minimum Average Soil Temperature= 33/16 deg C

Which temperature should be considered for above or underground pipeline for stress analysis?