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
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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