H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
(OP)
Hello folks.
I am not a metallurgist, so I am looking for some opinions on what to do in a produced water environment in which you have all four of these hypothetical but representative conditions:
(1) it is NACE sour
(2) it has measurable CO2
(3) it has chlorides above, say, 1000 ppm
(4) 2000 psig @ ~75 F
I see a lot of clients asking for ASTM A312 TP316/316L in such service. My thoughts are:
High PREN is good to address the CO2; H2S resistance probably good; not sure that I like the 1000 ppm chlorides with this metallurgy.
Might try Duplex SS...at a cost.
I think the optimum approach is to use internally coated carbon steel with something like a baked fusion bond epoxy.
Also, I have seen aluminum-bronze valves in such service...not sure I like such metallurgy in a NACE sour environment although I have been told that NAB offers acceptable resistance. In any case, I would propose an internally coated carbon steel valve and maybe try Impreglon.
Can anyone provide any thoughts / opinions?
Thanks all in advance.
I am not a metallurgist, so I am looking for some opinions on what to do in a produced water environment in which you have all four of these hypothetical but representative conditions:
(1) it is NACE sour
(2) it has measurable CO2
(3) it has chlorides above, say, 1000 ppm
(4) 2000 psig @ ~75 F
I see a lot of clients asking for ASTM A312 TP316/316L in such service. My thoughts are:
High PREN is good to address the CO2; H2S resistance probably good; not sure that I like the 1000 ppm chlorides with this metallurgy.
Might try Duplex SS...at a cost.
I think the optimum approach is to use internally coated carbon steel with something like a baked fusion bond epoxy.
Also, I have seen aluminum-bronze valves in such service...not sure I like such metallurgy in a NACE sour environment although I have been told that NAB offers acceptable resistance. In any case, I would propose an internally coated carbon steel valve and maybe try Impreglon.
Can anyone provide any thoughts / opinions?
Thanks all in advance.
Regards,
SNORGY.





RE: H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
In the 2000 psig range, you are probably limited to something like FiberSpar's (for example) FS LPJ 4-1/2 2250E (rated to 2250 psig and 115F. This pipe will handle 8400 bbl/day before it is running full. If you limit flow to 100 ft/s / density, then it can move 13,541 bbl/day of SG=1.0 water.
FlexSteel (which is a bit pricier) has a 2250 psig 6-inch product (5.604 ID) which requires 26,000 bbl/day to run full and maxes at 33,000 bbl/day.
Both of these products are inert to CO2, H2S, and Chlorides. It really saves a lot of angst deciding if you are going to design for H2S or Chlorides.
Oh yeah, this is metallurgy forum. I guess everyone will now yell at me. I'll apologise in advance for dragging the forum into the plastic weeds.
David
RE: H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
Thanks David.
Regards,
SNORGY.
RE: H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
I will endeavour to obtain a copy of ISO 21457 and take it from there.
I should have been more specific in my OP, but this installation is a modification to an existing facility (to B31.3 Code) and will not require 20 year life. 5 years is realistic; 10 is optimistic.
Regards,
SNORGY.
RE: H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
I'm currently working on an 8-inch gas gathering project where the pipe is too thin and the accumulated water is too corrosive. The solution I'm recommending to my client is an HDPE liner from United Pipeline. Like Spoolable Composite, this liner is inert to most chemicals and solves the problem of what kind of corrosion to be worried about.
David
RE: H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
We're always onto a loser trying to perform materials selection in an online forum: we never get the full picture of the technical and economic drivers.
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
Thanks...I have used United Pipeline Systems for liner pulls in the past (pipelines). Good system, never had any issues.
Steve:
"...onto a loser..." - I do apologize for not specifying all applicable drivers. Upstream O&G, small client, no float in the schedule, budget constrained...you know...same old, same old. I was merely asking for opinions from folks whom I have come to respect. I take them all under advisement, and at the end of the day, in combination with my own judgement, I apply the extent of judgement and engineering that the client will tolerate paying.
Regards,
SNORGY.
RE: H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
My recommendation in any event will be other than austenitic SS.
Regards,
SNORGY.
RE: H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
RE: H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
On first inspection, it was the H2S that concerned me in combination with a yellow metal, albeit alloy. Aluminum-bronze by itself would not be my first choice, whereas I would rather use nickel-aluminum-bronze to deal with the relatively low (but still sour) H2S than use 316-SS in combination with unspecified chlorides.
Thanks all for input.
Regards,
SNORGY.
RE: H2S vs CO2 vs Chlorides w.r.t. optimum pipe metallurgy for PW
My thoughts are, do not use 316 SS.
Regards,
SNORGY.