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Technical Discussions
Abdul Aziz
Engineering,
India, Joined Oct 2016, 7

Abdul Aziz

Engineering,
India,
Joined Oct 2016
7
16:23 Dec-18-2017
Contrast paint thickness

Hi all,

I would like to know how much shall be the thickness of white contrast paint while doing MPI.

Do the thickness of contrast paint affects the sensitivity of the inspection?

Kindly reply.

Thanks in advance.

 
 Reply 
 
Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 850

Michel Couture

NDT Inspector,
consultant,
Canada,
Joined Sep 2006
850
20:32 Dec-18-2017
Re: Contrast paint thickness
In Reply to Abdul Aziz at 16:23 Dec-18-2017 (Opening).

ASTM E709 and E1444 give you the thickness allowable for parts that are already painting where no paint removal is required. It is clear that contrast paint should not exceed this thickness. Also you have to remember the purpose of contrast paint is to provide a good background for inspection (contrast) and that paint should be applied enough to provide that background yet not excessively.

 
 Reply 
 
nazrul
nazrul
04:28 Oct-17-2019
Re: Contrast paint thickness
In Reply to Michel Couture at 20:32 Dec-18-2017 .

hi i would like to know about the white paint contrast thickness applied when i going to do the mpi . thats mean how much maximum thickness can apply for MPI testing .

thanks

 
 Reply 
 
THAPS MELIH
NDT Inspector,
heavy engineering and shipbuilding kuwait, India, Joined Feb 2017, 23

THAPS MELIH

NDT Inspector,
heavy engineering and shipbuilding kuwait,
India,
Joined Feb 2017
23
06:27 Oct-17-2019
Re: Contrast paint thickness
In Reply to nazrul at 04:28 Oct-17-2019 .

DEAR NAZRUL
YOU ARE ASKING ABOUT THE CONTRAST PAINT THICKNESS ... IT SHOULD BE WITHIN THE 0.02 MM TO 0.06 MM AND DEFINITELY IF THICKNESS OF THE PAINT IS BELOW THE DESIRED LEVEL THAT SHOULD BE LOW IN VISIBILITY IF THE THICKNESS OF PAINT IS TOO HIGH MEANS IT SHOULD AFFECT THE SENSITIVITY FOR EXAMPLE IF YOU PAINT TOO MUCH IF SOMETHING ROUNDED INDICATION ARE LINEAR INDICATION IS PRESENT IT SHOULD BE DIFFICULT TO INTERPRET SOMETIMES OVER PAINT CAN FILL THE POROSITY ALSO.....

 
 Reply 
 

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