Re: [MW:28036] MIC CORROSION or co2 wet corrosion(sweet corrosion)

Thank you so much for useful information.

Therefore you agree with me that these tests are not enough to conclude for SRB test.

Regardless of mentioned test, do you prescribe any other tests to consider possibility of co2 corrosion(mesa corrosion) or h2s pitting corrosion?

Regards.

On Wed, Jul 4, 2018 at 8:32 AM, 'Muhammad Hussain' via Materials & Welding <materials-welding@googlegroups.com> wrote:

This is not the method to measure SRB. There is a separate method called MSL for this and it's long time study, min 6 months to measure the SRB and it's status either it's living, present or absent. By then you can take a decision and precaution for eliminating this. 

Sent from my iPhone, Excuse Typos

On 4 Jul 2018, at 13:37, Ali Asghari <asgharialigl@gmail.com> wrote:

Unfortunately not.

I have attached them. I think this type of SRB test is qualitive.

On Tue, Jul 3, 2018 at 3:08 PM, 'Muhammad Hussain' via Materials & Welding <materials-welding@googlegroups.com> wrote:

It depends what is the current status of corrosion and how much damage is there? Also whats the materials of construction? 

Did your lab manage to measure the SRB and how much microbe is there? Without knowing this, its very hard to say what the material condition and how much time it will take to effect the material. 

Also depends on the MIC status as well. 

On Tuesday, July 3, 2018, 8:13:37 PM GMT+10, Ali Asghari <asgharialigl@gmail.com> wrote:

Dear Muhammad.

I have attached them.

I am only wondering that this corrosion with this rate may happen with detachable corrosion products by wetty co2 or h2s that affected by flow velocity.now how can we reach to this confidence or these results refuse this possibility.

Regards.

On Tue, Jul 3, 2018 at 7:03 AM, 'Muhammad Hussain' via Materials & Welding <materials-welding@googlegroups.com> wrote:

Dear Ali, 

1. Yes it's possible and you can take. Corrosion deposit , metal or perhaps in water to do the analysis. 

2. Can you send clear images of the sample, specially from pits. 

Chloride and Sulphide are different source and affect on MIC. 

Regards 

Muhammad 

Sent from my iPhone, Excuse Typos

On 2 Jul 2018, at 23:04, Ali Asghari <asgharialigl@gmail.com> wrote:

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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