Re: [MW:14338] COATING ON SS

Many thanks

Now, my question is if i use the insulation painting (instead of classic one with insulation material+Jacket) on concerned SS pipe/vessel, could this replace this provision of coating?

2012/5/21 Ahmed Husain <ahmraha@yahoo.com>

This coating requirement on SS material is applied for lines or equipment requiring insualtion. 

.

Please refer below para of API 571 for prevention/mitigation of chloride stress cracking. One of the recomendation is coating of materials. Since CSCC is mostly associated with SS and nickel alloys, following recommendation is applicable to these matyerials.

 

 

 

4.5.1.6

Prevention / Mitigation

a) Use resistant materials of construction.

b) When hydrotesting, use low chloride content water and dry out thoroughly and quickly.

c) Properly applied coatings under insulation.

d) Avoid designs that allow stagnant regions where chlorides can concentrate or deposit.

e) A high temperature stress relief of 300 Series SS after fabrication may reduce residual stresses.

However, consideration should be given to the possible effects of sensitization that may occur,

increasing susceptibility to polythionic SCC, possible distortion problems and potential reheat cracking.

 

Regards,

 

Ahmed Husain

From: Lassaad Mokrani <lassaad.mokrani@gmail.com>
To: materials-welding@googlegroups.com
Cc: ahmraha@yahoo.com
Sent: Saturday, May 19, 2012 1:42 PM
Subject: Re: [MW:14313] COATING ON SS

Many thanks Mr.Ahmed,

Is the application of coating for either insulation and corrosion protection ok?

2012/5/19 Ahmed Husain <ahmraha@yahoo.com>

Dear Mr. Mokrani,

 

Many client specification and API standards or RP recommends application of coating on Stainless steel materials prior to insualtion to minimize/eliminate possibility of chloride stress corrosion cracking. This requirment is also in Aramco specification. 

 

Ahmed Husain

From: Lassaad Mokrani <lassaad.mokrani@gmail.com>
To: pgoswami <pgoswami@quickclic.net>; materials-welding@googlegroups.com
Sent: Friday, May 18, 2012 12:34 PM
Subject: [MW:14299] COATING ON SS

Gentelmen,

We are fabricating a SS 316L Fuel Gas scrubber 

For PP reasons, an insulation layer has to be applied. The client was asking to apply  an anticorrosion coating to the stainless steel material of the vessel for corrosion protection in marine environment.

In our experience we never did that for SS.

What do you think?. 

Is there any STD/Code that force that?

Design code: AMSE VIII Div 1

Location: Offshore Plateform

Meilleures salutations

Mokrani Lassaad

EPPM Sa.
00216 20 649 755
http://www.linkedin.com/pub/lassaad-mokrani/16/364/907


















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Meilleures salutations

MOKRANI Lassaad

Consultant Civil Engineer

Tunisia

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