RE: [MW:23696] RE: 23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

The following publication should answer most questions about pickling and passivation of stainless steel.

 

http://www.euro-inox.org/pdf/map/Passivating_Pickling_EN.pdf

 

Alan Denney

AKD Materials Consulting Ltd

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Jim Price
Sent: 08 October 2015 12:40
To: materials-welding@googlegroups.com
Subject: RE: [MW:23688] RE: 23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

 

First you probably would need to check the depth of pitting to ensure integrity concerning stress flows and repair as required especially at toe of welds or violation of allowed depth.

From what I see passivation would be minimal help, pickling would be my choice.

As far as painting is concerned you would need to clean and either passivate or pickle prior to painting.

Natural formation of oxide layer requires oxygenated condition painting would not allow for this natural process.

Copy of emails for reference I have received:

Jim,

Stainless steel self-passivates in air but the Cr/Fe surface is less than the chemically passivated stainless steel and corrosion resistance is better on chemically passivated stainless steel.

 

Dear Jim,

The nitric and citric acid treatments below are extracts from ASTM A967, I would recommend you buy it and/or other standards if you are carrying out passivation treatments on a regular basis?  While natural passivation of a virgin stainless steel surface will occur immediately it can take a day or more for the passive layer to thicken and develop an optimum thickness, assuming the surface is well aerated. That is why acid passivation treatments have been designed to accelerate the process.

 From BSSA

Nitric Acid Treatments

Citric Acid Treatments

 

 

 

Jim Price | Welding Engineer, CWI

Direct:  320.7463439 | Fax: 417-862-5564

jimprice@polarcorp.com

 

 

 

 

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
Sent: Wednesday, October 07, 2015 9:28 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:23678] RE: 23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

 

Dear all ,

 

Please see the photos attached after my visit to offshore platform , I applied only SS wire brush , it s been removed. 

Now my doubt is can I go for pickling passivation or paint methodology? Client not approving for sweep blast as it in site condition in that case my opinion is not to coat with paint .

Only we allowed to use power tools in tank for surface cleaning . Please drop your suggestion on methodology. It s gas platform during shut down we need to clean and retain their properties of SS tank. 

 

P.NEILASHKUMAR 

Sent from my iPad

MOB : 966 533098265

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On Oct 5, 2015, at 5:11 PM, pgoswami <pgoswami@quickclic.net> wrote:

Hi Neilashkumar,

 

Aramco has some of the most comprehensive standards on Corrosion Protection".Two relevant standards are cited below. The following paragraph from SAES-L-133 may provide you some guidelines as heads up.

 

 

Thanks.

 

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Engineering Specialist

Hamilton, Ontario, Canada

pgoswami@quickclic.net

pradip.goswami@gmail.com

ca.LinkedIn.com/pub/pradip-goswami/5/985/299

 

SAES-H-004, 11 October 2006,Protective Coating Selection & Application, Requirements for Offshore Structures and Facilities

SAES-L-133, 10 August 2009 Corrosion Protection Requirements for Pipelines, Piping and Process Equipment

7.2.5 Completely coat the outer metal surface of all 300-series stainless steels that may cycle into the temperature range from 104 deg F (40 deg C) up to the maximum service temperature of the available coating systems in order to protect them from pitting and stress corrosion cracking. Use thermal spray aluminum, organic coatings with zero leachable chlorides that are approved for immersion service, or foil wraps as detailed in the NACE RP0198 - 2004, Section 4, Table 1 and EFC 55. Contact the coatings RSA in CSD/ME&CCD for a list of approved coating products. Use low leachable chloride insulation in accordance with ASTM C795. Use insulation materials and weatherproofing to prevent water ingress and that do not allow the absorption of water.

 

 

---

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
Sent: Sunday, October 04, 2015 2:40 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:23659] RE: 23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

Dear Sirs ,

 

Thank you so much of all your suggestions , I am travelling now to offshore to see the real condition of this tank and need to discuss with aramco , let me come back to you after discussion in this subject.

P.NEILASHKUMAR 

Sent from my iPad

MOB : 966 533098265

            91+9952110791

On Oct 4, 2015, at 11:42 AM, Alan Denney <alan@denney1.freeserve.co.uk> wrote:

You only apply insulation if you need to insulate for process reasons.

The risk of corrosion under insulation is very real and you should not confuse insulation with protecting against corrosion. If it saturates (which it can easily do so) it is both the medium causing the corrosion and mask the corrosion from view.

Pickling and passivating will deal with the current surface corrosion on 316 stainless steel and leave it looking rust free, but the pits will still be there.

In an exposed marine environment, which has already caused a significant amount of corrosion the rust staining will re-appear.

You can pickle and passivate to clean up and then apply paint coatings to prevent this happening, but they need good surface preparation and proper application, and you should get advice from the coatings companies.

The application of coatings to 316 stainless steel is a recognised way of minimising corrosion in warm marine environments.

The idea of flame-sprayed aluminium (suggested by one correspondent) is interesting but applying it in-situ seems to be to be an even more difficult challenge than the idea of applying a decent paint coating.

Alan Denney

AKD Materials Consulting Ltd

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Lassaad Mokrani
Sent: 03 October 2015 19:17
To: materials-welding@googlegroups.com
Subject: Re: [MW:23653] RE: 23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

Dear All

I agree with Pradip

But, please note that the applied coating should be well selected to avoid Corrosion Under Insulation (CUI) problem.

A rough verification of the process whether the preservation of Heat will/not affect

KR 

On Saturday, October 3, 2015, pgoswami <pgoswami@quickclic.net> wrote:

Hi,

Resending this response after correcting some "typos"

Thanks.

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Engineering Specialist

Hamilton, Ontario, Canada

pgoswami@quickclic.net

pradip.goswami@gmail.com

ca.linkedin.com/pub/pradip-goswami/5/985/299

---

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of pgoswami
Sent: Friday, October 02, 2015 11:45 PM
To: materials-welding@googlegroups.com
Subject: RE: [MW:23642] RE: 23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

Hi Neilashkumar,

I would like to add a few notes in addition to the comments of Mr. Alan Denny.

Painting is quite uncommon for austenitic stainless steels. Following fabrication and welding, complete pickling + passivation is more common practice. In addition depending on the surrounding environmental conditions stainless steel vessels and piping are   often  insulated   ( which is another protective shield against atmospheric corrosion). Usually  C5M grade of paints are recommended for stainless steel in marine environments.

Often paints may contain items such as "isocyanates" which has serious health and safety issues. In these  attached  documents the texts with yellow or green highlights are recommended while the one with red  requires "CAUTION". It would be advisable ( as stated earlier by Alan) to consult the paint manufacturers.  

 Irrespective of painting or other option full surface cleaning and surface preparation by blasting is recommended.

The other and safer option would be to blast clean the surface, perform in situ pickling and  passivate and then to  insulate the vessel.  Avesta( http://www.avestafinishing.com/products/pickling-spray.aspx) has good and proven products for such passivation work. You may find out more details for local vendors.

Thanks.

Pradip Goswami, P.Eng,IWE

Welding & Metallurgical Engineering Specialist

Hamilton, Ontario, Canada

pgoswami@quickclic.net

pradip.goswami@gmail.com

ca.linkedin.com/pub/pradip-goswami/5/985/299

---

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Alan Denney
Sent: Friday, October 02, 2015 5:07 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:23640] RE: 23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

The coating manufacturers are normally very helpful in providing the advice you need regarding application of their coatings to difficult substrate materials. I suggest you put this question to Hempel or to International Paints (Akzo Nobel). The challenge will be doing this in-situ and achieving the necessary surface preparation standard. I would expect, as I think you have anticipated, that you first have to pickle and passivate before performing surface preparation and coating if this coating is to have any durability.

Alan Denney

AKD Materials Consulting Ltd

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com]
Sent: 01 October 2015 20:01
To: materials-welding@googlegroups.com
Subject: Re: [MW:23638] RE: 23626] Re: NEED ADVISE CORROSION IN INHIBITOR TANK REGD

Dear All ,

Instead of Pickling and passivation Can anyone advise or suggest any epoxy type coating spray from hempell is advisable ? I need your valuable point on this subject.

Because after pickling and passivation client is asking me what guaranty it will not corrode again? Since it is a marine environment. 

P.NEILASHKUMAR 

Sent from my iPad

MOB : 966 533098265

            91+9952110791

On Sep 30, 2015, at 5:57 PM, george.dilintas@gr.bureauveritas.com wrote:

true because of sensitization
but the image of the vessel indicates iron contamination

best regards

Dr. Georgios Dilintas

Authorized Nuclear Inspector
Authorized Inspector Supervisor

I&F REGIONAL TECHNICAL MANAGER
BUREAU VERITAS PIRAEUS - GREECE

Tel: +30 210 40 63 113 /4 /5
Fax: +30 210 40 63 118
Cell: +30 69 44 64 62 04
This message contains confidential information. To know more, please click on the following link: http://disclaimer.bureauveritas.com

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