Thickness of Painting (DFT)

[Karthikeyan Muthuvel]

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.karth...@gmail.com

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[PRAMODH NAIR]

Dear Karthikeyan,

Refer your project specification/procedure, which standard to be followed. If nothing is mentioned, refer SSPC PA2. Its describe (Procedure) how you have to measure  the DFT. 

If the thickness is higher than what it is mentioned in the specification, always refer with coating manufacture/specifier/designer.

Regards,

Pramodh Ramanunny

If We Work With Determination And Perfection, Success Will Follow

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[Firoz Ahmed Makrani]

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

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[Aakash]

Dear Shri Karthi,

 Its a huge difference between required and observed. If it very localized reading then may be think off if this reading is in general then simply reject it. Higher the DFT more probability of Peeling off.

Regards

HNJ

[Ramin Kondori]

Normally, it should be rejected. The norm for maximum applied paint (or each layer) is 2 times the specified DFT. But refer to paint manufacturer all the time. Though, some of them give you false assurances.

Ramin  Kondori

Sr. QA/QC & Welding Engineer

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[Dinesh Somwanshi]

Dear sir,

Higher DFT cause paint cracking after drying, Reason DFT shall controlled. 

Thanks & Regards

DINESH VITTHAL SOMWANSHI

BACHELOR IN MECHANICAL ENGINEER

AUTHORIZED PIPING / WELDING / NDT / PAINTING INSPECTION PERSONNEL
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On Tue, Jan 16, 2018 at 11:06 AM, Ramin Kondori <ramink...@gmail.com> wrote:

Normally, it should be rejected. The norm for maximum applied paint (or each layer) is 2 times the specified DFT. But refer to paint manufacturer all the time. Though, some of them give you false assurances.

Ramin  Kondori

Sr. QA/QC & Welding Engineer

-----------------------------------------------------------

PG-Dip. in Welding Engineering (IWE  AT  0070)

BSc. in Civil Engineering (IUT)

BGAS Painting Inspector

ASNT Level I&II

                        

[sanjay badkas]

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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[kingslygeo vargheese]

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.

[Sam SM]

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

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