Material specs for high level of H2S.
Material specs for high level of H2S.
(OP)
Hey,
I have to choose a material to be used in an environment with:
52000ppm H2S
Tmax = 95C (maximum temperature)
Pmax= 10 000psi (maximum pressure)
pH2S = 520psi (partial pressure)
I've read a bit in NACE MR0175 and found that I could use some cold-worked alloys of type 4e.
Could someone give me some pointers?
Thanks
I have to choose a material to be used in an environment with:
52000ppm H2S
Tmax = 95C (maximum temperature)
Pmax= 10 000psi (maximum pressure)
pH2S = 520psi (partial pressure)
I've read a bit in NACE MR0175 and found that I could use some cold-worked alloys of type 4e.
Could someone give me some pointers?
Thanks





RE: Material specs for high level of H2S.
I've heard something about adding a layer of inconel to other materials to increase the corrosion resistance, anyone have some good resources on this?
Thanks
RE: Material specs for high level of H2S.
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Material specs for high level of H2S.
http://www.specialmetals.com
http://www.haynesintl.com/
RE: Material specs for high level of H2S.
TVP: Thank you for the links.
RE: Material specs for high level of H2S.
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Material specs for high level of H2S.
RE: Material specs for high level of H2S.
RE: Material specs for high level of H2S.
it seems a waste of time and money to select an inconel...
S.
Corrosion Prevention & Corrosion Control
RE: Material specs for high level of H2S.
So if I have a high concentration of h2s in a flow without co2, there isn't any danger of h2s related corrosion?
Interesting!
Thank you
RE: Material specs for high level of H2S.
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Material specs for high level of H2S.
I'm still interested in hearing a bit more about CO2, if someone has the time.
Thanks
RE: Material specs for high level of H2S.
Materials Performance, August 2002, pp60-64
Corrosion, Vol 59, (8), pp659-683, 2003
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Material specs for high level of H2S.
RE: Material specs for high level of H2S.
In Oil&Gas when selecting materials the first assessment is based on CO2 corrosion for Carbon Steel. There is a model based on DeWaard-Milliams model (1991) that allow you to calculate the corrosion rate for carbon steel.
The corrosion rate for carbon steel due to CO2 is a function of several factors.
- Partial pressure of CO2 in gas phase
- Temperature
-Pressure
-Water cut
-Water analysis (mainly bicarbonate content) and if ti's formation water or condensation water from a gas phase.
-Fluid velocity...
Using the model, now there are severeal model based on the original and also several software, you calculate the corrosion rate for carbon steel, then if this corrosion rate allow to specify a corrosion allowance of, usually the maximum is 6 mm, the you can select carbon steel, with corrosion inhibitor if applicable, otherwise you'0ve to go to a CRA (corrosion resistant alloy).
H2S has an effect on CO2 corrosion rate mainly increasing the likelihood of localized corrosion type.
this is a good paper that can explain how to calculate corrosion rate and tehre is also a free software from NORSOK. This model is limited to a partial pressure of 0.5 abr of H2S.
ht
http://www.standard.no/imaker.exe?id=10405
here you can find a lot of useful paper on CO2 and H2S corrosion:
htt
http:/
this is a good paper on H2S corrosion and NACE/ISO 15156 use:
Use of International Standard NACE MR0175/ISO15156
http:
hope this help u:
S.
Corrosion Prevention & Corrosion Control
RE: Material specs for high level of H2S.
As of using carbon steel, where I work we only use duplex S31803, super duplex or inconel. There's never talk of anything else..I'm very new and dare not ask too many questions :)