Re: [MW:27469] Thickness of Painting (DFT)

Dear Karthik 

Your enquiry is not clear. Please verify that your piping is above ground or underground. If above ground piping, check the applicable painting system related to service temperature. Check whether it's 2 coat or 3 coat painting. If so check each coating report (primer, intermediate) that the correct DFT has been maintained, then only you can conclude. If it's underground piping, high build epoxy and high build polyurethane paints are used in which you can achieve higher dft in single coat ( minimum 350microns)

The first thing you can witness sagging in high dft application

Second, there won't be any adhesive strength in high dft application 

Hope the above clarifies

On Tue, Mar 6, 2018 at 8:42 AM kingslygeo vargheese <kingslygeotech@gmail.com> wrote:

Dears,

The high DFT may be Due to the lack of curing in the intermediate coats.

This case lack of adhesion in the  intermediate coating and subsequent defects, has to be rejected.

Regards

Kingsly Geo.

On 19 January 2018 at 09:56, sanjay badkas <sanjaybadkas@gmail.com> wrote:

Dear Karthikeyan,

Please go through SSPC-10 standard for measuring DFT. In your case, please check paint system specified for the said piping. Every paint system has at least three parts.

First abrasive blasting /cleaning and priming, second is intermediate coat and third is top coat. Each layer has specified dry film thickness. Total thickness is 350..there is big possibility that prime coat may have 100 microns, intermediate 100 microns and top coat of PU - polyurathane 50 microns...please check.

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On 13 January 2018 at 17:55, Karthikeyan Muthuvel <m.karthick2020@gmail.com> wrote:

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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