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
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
-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