Pitting corrosion on Carbon steel flow line

[sw71im]

Folks,

Any ideas of what auses the pitting corrosion on wet gas carbonsteel pileline?

Any feedback would be appreciated.

Please see attached

 

[valvesarefun]

sw71im,

It could be caused by a hundered different things. You are going to have to be more specific about all the details of your specific application before anyone can make an educated guess as to what your problem is.

Best Regards,

VRF

 

[emxhps06]

You would need to dig out any relevlant background information in regards to the pipeline in service.

Questions such as:
1) What's the operating condition
2) Apart from wet gas, what's running inside the pipeline (e.g. HP steam, any contaminations'?
3) Where there a change of duty prior to flooding the pipeline with wet gas?
4) What's in the wet gas?
5) Where's the pipeline running from? (e.f. refining units, hydro desulphidation unit etc. etc.)
6) Any history of failure in regards to the pipeline?

 

[SJones]

See if you can play snap with any picture in the NALCO publication, Corrosion in the petroleum industry (11 MB pdf that won't attach). Is the picture at the top of the line and what is the steady state flow regime? The words wet and gas usually go with CO2 corrosion.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04