I assume your point is whether CO2 corrosion or MIC is the root cause or one of the causes. We a few things to note:
1. MIC typically occurs in stagnated condition.
2. CO2 corrosion may happen in both operating and stagnated condition, in presence of substantial amount of CO2 and water. Read the attached article for details. The details provided by you does not highlight any details related to CO2 corrosion, e.g. media, CO2 concentration, temperature etc.…
If the pipeline contained stagnated water(without any inhibitor) for over 6 months , there're every possibilities of occurrence of MIC.
Perhaps discussion of these points with the Laboratory would be helpful. To answer your question SRB (causing MIC) could be aerobic and anaerobic both. The lab has to tell what's generic form of the bacteria.
Thanks.
P.Goswami.P.Eng, IWE.
Welding & Metallurgical Specialist
Linkedin: https://www.linkedin.com/in/pradip-goswami-2999855/
Email:pgoswami@quickclic.net,pradip.goswami@gmail.com
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ali Asghari
Sent: July 2, 2018 9:05 AM
To: Materials & Welding <materials-welding@googlegroups.com>
Subject: [MW:28017] MIC CORROSION or co2 wet corrosion(sweet corrosion)
Dear All.
We encountered to a pitting corrosion that led to loss of fluid in crude pipeline, so we prepared a sample and send it to lab.it must be mentioned that this corrosion happened after 6 months from starting of production and there is possibility for existence of remained hydro test water and the chemical injection not to start any inhibitor injection with regarding in engineering design documents, availability of 95% inhibitor requested and warned for retained water to increase of pitting opportunity.
the lab concluded the result of this corrosion is MIC(SRB type) with doing of these tests: EDS/XRD/SRB test.
Now I have some doubts:
1.SRB or anaerobe bacteria can be survived & detected in air to reach Lab.
2.I know that to get conclusion by now is not possible but I want to know that are these tests enough or what is supposed to be done other tests to refuse co2 corrosion?
I have attached some results.
Regards.
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