316SS vs 17-4PH stems in H2S service
316SS vs 17-4PH stems in H2S service
(OP)
Hi fellas,
I have customers telling their slab pipeline gate valves must have 17-4PH stems insisting they perform far better than 316 stainless in environments where Hydrogen embrittlement can be an issue. I am not so sure that is the case and not looking to spend the extra money on stock when it's not really necessary. To be honest though I cant sell them on that position because I am not really sure how right or wrong they are.
How big of a difference will it make switching to 174-PH? Is it even advantageous in the first place?
thanks,
-G
I have customers telling their slab pipeline gate valves must have 17-4PH stems insisting they perform far better than 316 stainless in environments where Hydrogen embrittlement can be an issue. I am not so sure that is the case and not looking to spend the extra money on stock when it's not really necessary. To be honest though I cant sell them on that position because I am not really sure how right or wrong they are.
How big of a difference will it make switching to 174-PH? Is it even advantageous in the first place?
thanks,
-G





RE: 316SS vs 17-4PH stems in H2S service
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: 316SS vs 17-4PH stems in H2S service
BUT, I need to know if there are advantages with the 316 or with the 17-4. I'm a salesman but want to sell them the best product, not steer them towards what I can unload quickest. Currently we stock the 316 stems after a major end user required it over our previous standard 410 stem. Now they say they think the 17-4 is better. I am not so sure, which is why I'm asking you. If it is truly the better material for H2S, I would consider changing my commodity item to have 17-4 stems. But if I am significantly limited because it doesnt meet NACE, then I have a bigger decision to make as we can't afford to keep both on the floor.
RE: 316SS vs 17-4PH stems in H2S service
Leaning towards the 316 after reading but very much appreciate your answer to above if you could.
RE: 316SS vs 17-4PH stems in H2S service
If the stem of the valve is not actually exposed to the H2S containing fluid, there is scope to accept the end user's directive.
So, how lucky does your customer feel?
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.