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ASME Allowable Stress Values for Low Temperatures
4

ASME Allowable Stress Values for Low Temperatures

ASME Allowable Stress Values for Low Temperatures

(OP)
Does anyone know how to determine allowable stress values for low temperatures. I need to know what ASME states for design temperature if I am designing a vessel for operation at -196°C. For example: I am using SA240 304. the allowable stress (ATM) = 206.9 MPa, Allowable stress (DT ((@-196°C)) = ???

RE: ASME Allowable Stress Values for Low Temperatures

It is the same.

RE: ASME Allowable Stress Values for Low Temperatures

It is the same design stress.

At that temperature however, additional impact testing requirements will need to be addressed due to low temperature embrittlement.

Cheers,

RE: ASME Allowable Stress Values for Low Temperatures

The allowable stress for SA-240 304 at atmospheric temperature is 138 MPa not 206.9 MPa. There are increased low temperature allowables in table ULT-23.

RE: ASME Allowable Stress Values for Low Temperatures

(OP)
Sorry should have mentioned I am referring to 1998 Ed. for CFR stress requirements.

Thanks for everyone's input on this!!

RE: ASME Allowable Stress Values for Low Temperatures

3
@Mark1arm,
I believe your question is addressed in General Note (e) for table 1A in II-D.

"(e) Stress values for -20°F to 100°F are applicable for colder temperatures when the toughness requirements of Section III,VIII, or XII are met."

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