316SS piping for hydrogen gas service
316SS piping for hydrogen gas service
(OP)
I am reconfiguring the hydrogen gas supply lines to several vessels in a hydrogenation pilot plant. The new pipe will be 316 SS with an operating pressure up to 1100 psig, at ambient temperatures (-10 to 110 F). I know H2 gas generated during passivation of SS can cause hydrogen embrittlement and that heat treating can remove the hydrogen gas in the metal. But considering this pipe will be under hydrogen gas service, I'm curious if the passive layer is needed. Would migration of hydrogen gas into the metal be hindered, assisted, or not affected by the passive layer?





RE: 316SS piping for hydrogen gas service
316 is better than 304 because the higher Ni makes the austenite more stable during any cold-working.
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein
RE: 316SS piping for hydrogen gas service
Put a limit on how magnetic it is (max permeability of 1.04).
You won't hydrogen embrittle the 316, just places with excessive ferrite or martensite.
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Plymouth Tube
RE: 316SS piping for hydrogen gas service
http://www.asme.org/products/codes---standards/hyd...
RE: 316SS piping for hydrogen gas service
Our corporate engineering standards reccommend passivation for stainless steel lines that will handle liquids, but our standards do not call for passivation of systems carrying gases. It appears passivation of the new pipe would not provide any added benefit.
RE: 316SS piping for hydrogen gas service
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Plymouth Tube
RE: 316SS piping for hydrogen gas service
RE: 316SS piping for hydrogen gas service
"You see, wire telegraph is like a very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? Radio operates the same way: You send signals here, they receive them there. The only difference is there is no cat." A. Einstein
RE: 316SS piping for hydrogen gas service
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Plymouth Tube
RE: 316SS piping for hydrogen gas service