SA240 TP304L? for Cryogenic Vessel (-128¦C) 1

[StressFreak]

According to a senior design eng of our firm, the correct material for this vessel (design temp= 100/-128 °C) is SA240 TP304L.

According to ASME Secc 2D (Metallurgical Phenomena), the only materials which do not show a decrease in the tensile yield nor ductility measured as percent elongation are those listed in tables 1B and 2B from section 2B (non-ferrous materials).

So I conclude that this material (SA240 TP304L) could be used only if impact testing is provided.

I'd like to know what you think about this.

Thanks,
Diego.

 

[metengr]

Impact testing would not be required for this material.

 

[rhg]

Depending of welding procedure. See ASME VIII Div. 1 UHA-51

Regards
rhg

 

[metengr]

rhg;
If the MDMT is -186 deg C or warmer impact testing of this material including HAZ's is exempt (see UHA-51 (d)).

 

[zjliang]

How about SA-353? It could be used as low as -320F (about -196 dC), right?
Thanks.

 

[metengr]

zjliang;
Yes, it can but it requires CVN impact testing for MDMT at or warmer than -196 deg C (see UHT-6(a)). For colder metal temperatures, in addition to CVN tests, drop weight testing shall be performed (see UHT-6 (b)).

 

[StressFreak]

It seems very clear now that I read the UHA-51. Sometimes I feel that you have to know this code by heart to find stuff.

Thanks,
Diego.