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RE: [MW:11201] pittings on surface of Shell

By Materials & Welding

As this vessel is low pressure water service, you could do buttering onto the shell pitting areas by using qualified WPS & welder.

Make smooth grinding and MPI before buttering and do MPI after buttering.

(Of course, ASME SEC VIII DIV1 requirement to be checked and derogate as required)

 

 

Rgds,

 

WN

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Ahmed Eissa
Sent: Saturday, May 28, 2011 10:36 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:11177] pittings on surface of Shell

 

please refer to API 510 (corrosion and minimum thickness evaluation) clause , since you have corrosion allawance 3mm, thus you do not to fear, but we have smillar case in our plant so we applied internal coat (joutn marthon) as this coat is hard and applied to splash zone in offshore rig, and we inspect it after one year the condition of paint was excellent and no pitting was observed , you have to think in internal coating to stop pitting from proceeding.

--- On Sat, 5/28/11, asad azmi <azmiasadayub@gmail.com> wrote:


From: asad azmi <azmiasadayub@gmail.com>
Subject: Re: [MW:11173] pittings on surface of Shell
To: materials-welding@googlegroups.com
Date: Saturday, May 28, 2011, 5:44 AM

vessel is newly consturcted. there is no problem regarding thickness. corrosion allowance is 3 mm.

Regards

On Sat, May 28, 2011 at 7:36 AM, Suresh <bobsuresh24@gmail.com> wrote:

Hii,

 

You should mentioned below info requirement prior to take any decision .

 

1. How long period in service .

2.What is previous Corrosion allowance as Inspection was carried out .

3.you should mentioned in what area to be taken under serious consideration and how much  depth in major areas.

 

Thank you

 

Suresh

On Fri, May 27, 2011 at 12:44 PM, asad azmi <azmiasadayub@gmail.com> wrote:

Dear All,

 

Greetings.

 

Pittings (not more than 0.5 mm in depth) observed on the surface of a shell of a Vessel. pls find photos for your reference.

 

Shell material  is SA 36. thickness 8mm. service fluid - water

 

Code of construction is ASME SEC VIII DIV1

 

After grindings also pittings can be observed on the large surface of the shell.

 

Whether these pittings can be accepted as it is OR further grinding is required.

 

Please Suggest.

 

Thanks and Regards

 

Asad Azmi

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--
Thanks  & Best Regards,

Suresh

Mobile No: 91-92 92 905 905

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The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

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