ASME Allowable Stress Values for Low Temperatures 4

[Mark1arm]

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)) = ???

 

[weldstan]

It is the same.

 

[marty007]

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,

 

[rumandcola]

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.

 

[Mark1arm]

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

Thanks for everyone's input on this!!

 

[DandB]

@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."