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H2S Corrosion in Black Sea

H2S Corrosion in Black Sea

H2S Corrosion in Black Sea

(OP)
Would like to know if steel springs in equipment about to be put on Black Sea floor will be affected by the H2S in solution in the Black Sea

RE: H2S Corrosion in Black Sea

Yes.

RE: H2S Corrosion in Black Sea

(OP)
Thanks TVP - we thought it would but what can we do to make the springs reliable - stainless? The springs are quite powerful having to close 3000psi w.p. valves and are open to the sea. How long does the hydrogen embrittlement take to affect steel - weeks, months? Any pointers greatfully recd.

RE: H2S Corrosion in Black Sea

The Black Sea is saltwater, right? So you have chlorides to worry about in addition to H2S.

RE: H2S Corrosion in Black Sea

(OP)
Have used these springs/valves since the seventies sub sea and get some corrosion - they last about 18 months. The thing with the Black Sea is that below +/- 200m water is anoxic hydrogen sulphide soup and we've never used these springs in this environment, just wanted to know if we can expect problems from H2S in solution.

RE: H2S Corrosion in Black Sea

gregozo1,

I agree with CoryPad, use the NACE document as a guide for suitable material selection.  Even stainless spring steels will be questionable in H2S environment.  I am not sure if nickel-based grades like Alloy X-750 are suitable for sulfide exposure, but titanium alloys definitely are.  I would investigate a suitable titanium alloy and re-design the spring to accommodate it.  Renton Coil Spring in the USA is a leader vendor of titanium springs.

RE: H2S Corrosion in Black Sea

X-750 would be ok as would Titanium. MP-35N and Elgiloy would also be acceptable. 17-4 and 17-7 would probably be attacked by the chlorides.

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