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A333 vs 304SS for low temp, high pressure ethylene

A333 vs 304SS for low temp, high pressure ethylene

A333 vs 304SS for low temp, high pressure ethylene

(OP)
Hi.  We bring in ethylene through a 2" sch 160 pipeline, at pressures up to 1400 psig.  The pipeline is A53 carbon steel, with a minimum temperature rating of -20F.

In the event of a sudden depressurization, the temperature could drop as low as -40F.  So we want to replace the pipeline with something rated for a lower temperature.

That seems to leave me with a choice of A333 carbon steel or austenitic stainless.  Is one preferable over the other?  I'm particularly confused about Charpy testing -- various readings seem to contradict each other as to whether I need to do it on one or the other, or both.  What do y'all think?

Many thanks,

John

RE: A333 vs 304SS for low temp, high pressure ethylene

Hi Macossay,
-40 F isn't considered cryogenic.  I think you'll find the Piping & fluid mechanics engineering forum a better location for your question.  Try posting your question here:
http://www.eng-tips.com/threadminder.cfm?pid=378

RE: A333 vs 304SS for low temp, high pressure ethylene

(OP)
OK

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