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

 

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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

 

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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

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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

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Authorized Inspector Supervisor

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