[MW:27263] RE: 27256] Thickness of Painting (DFT)

Dear Karthikeyan,

When I assume what you mean by the datasheet is the project specification and it is mentioned Maximum 350 microns it's definitely a contract violation and may not be acceptable. Further for what standard to use is dependent on your project coating specification. However the most common is NACE/SSPC PA2. The standard calls for 3 readings should be taken within a circle of 1.5" dia and the average is called one spot; in your case the average of three readings should not be above 350microns ie the range of one spot should be 280~350micron (80%~100%). However practically its not possible that you get a reading like 1000 and still your average is 350%maximum. So this cannot be acceptable

Assuming that the data sheet of the paint material calls for 350microns maximum then you can not in any case cross the limit of manufacturer datasheet.

Further the defects due to high film thickness are dependent on the paint material; improper curing, cracks, checking, wrinkling or amine blush are few to name.

Your paint manufacturer may give you proper solution however in the most cases only solution is reblasting.

 

With best regards,

Umar

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Karthikeyan Muthuvel
Sent: Saturday, January 13, 2018 3:26 PM
To: materials-welding@googlegroups.com
Subject: [MW:27256] Thickness of Painting (DFT)

 

Dear Experts,

 

I'm very fresh for Painting Inspection, Kindly advise me for following 

 

In the data sheet it is mentioned maximum DFT  is 350 microns, when I measured on the piping its shows 1000 microns  and above, Please clarify is it acceptable or not which international standards should i follow and what are defect will occur due to the higher thickness of coating.

 

 Looking forward for yours kind valuable feedback.

 

Thanks & Warm Regards,

KARTHIKEYAN  M.

Mobile:+966-501176985,

E-mail: m.karthick2020@gmail.com

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