stainless steel pitting in dearated conditions 4

[CREAAM]

Is there a credible risk of chloride pitting or SCC in production lines/risers (flexibles with 316 and 304 carcass) and or produce water reinjection duplex lines (no sea water) handling deaerated produced fluids with chloride concentration of up to 100,000 mg/l, at temperatures up to 120°C.
It is assumed that since there is no seawater injection the produced fluids are oxygen free.

 

[SJones]

There is always a 'credible risk.' What you appear to be asking is: is there a more than negligible likelihood. I certainly would not like to see 304 in the frame, but the others stand a reasonable chance. As usual, there isn't a great deal of fluid compositional data to go on. For questions like this your first reference point could be

http://www.nickelinstitute.org/en/T...istantAlloysintheOilandGasIndustry_10073.aspx

Most data will be for parent materials, but it is more likely that any welds will be the problem area.

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.

 

[EdStainless]

The reinjection bothers me, because unless the system is very good there will be oxygen in it. It does not take much.
In such a system I wouldn't touch an austenitic, at least the duplex grades have some resistance to SCC.

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