thePetroStreet

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It varies from case to case. Not always the transportation of gas at lower temperature is economical. It primarily depends upon the climatic conditions of the area where gas is being transported.
Stresses in pipelines are mainly due to the internal pressure and temperature conditions. Explain a bit ...

Useful video.
Thanks.

arcpro,
Either of the two you use keeping this in mind.
Low levels of austenite: - Poor toughness and general corrosion resistance.
High levels of austenite: - Some Reduction in strength and reduced resistance to stress corrosion cracking.

octane,
For carbon steels to duplex stainless steels, you ...

Octane: You have to follow the requirements as in ASME VIII Div. 1. No need to PWHT.
Jiteshvk: Pressure vessels only face the circumferential and longitudinal stresses however piping due to its lay-out / routing undergoes torsional stresses also. That's the reason in piping code for carbon steel ...

What's the pipe ASTM?
Design code?

Table A-1 of ASME B31.3 mentions the first stress value from Min. Temp. to 100F. It's very obvious to consider that stress value as the allowable stress at minimum design temperature.

When code says stress at minimum design temperature, you have to use the given value in Table A-1 that is for A-106 gr. B pipe, Sallowable would be 20ksi.
Now calculate the actual stress, Sactual, from the formula as provided by salzx64. And while calculating actual stress you must deduct the ...

You are not looking at the right curve.
For A106 Gr. B, curve B applies as per Table A-1 of ASME B31.3 under Min. Temp. column. So the allowable MDMT without reduction as per curves is -29 deg C.

You must have known the phenomenon of Brittle Fracture associated with low temperature operation of steels due to reduced toughness.
If your MDMT is coming out to be -10 deg C and the carbon steel in question is not impact tested, you cannot go below -10 deg C in any case as brittle fracture ...