As all related are well known about painting as far as my knowledge if your requirement is 75 microns you have to maintained DFT through out the job but; practically it is not possible to maintained DFT uniformaly.however must be try to maintained DFT as required but avarage DFT is not a solution to
accept the painting because suppose you observed 25, 40, 50 etc. microns in place of 75 mirons you must checked surrounding painted area's DFT and according to that you must be re-work to maintain Required DFT if it is less than required . In the meanwhile prior to apply paint you must check the retio of mixing /pressure/distance . which may help you to maintained DFT near about or pluss side of requirement but .".AVERAGE DFT IS NOT A SOLUTION TO ACCEPT THE PAINTING.
--- Original Message -----
From: manoj john
Sent: Mon, 3 Oct 2011 09:07:13 +0530 (IST)
Subject: [MW:12607] DFT ACCEPTANCE AND REJECTION OF PAINTING.
Can anybody give the acceptance and rejection criteria as per SSPC PA2. I have applied primer to the shell surface of storage tank. The minimum DFT required is 75 micron. The actual average DFT is 70 micron and above but at some spot I got 15, 30 , 40 microns. Is it acceptable the total area is 2500 M2.
I have taken 5 spot reading in 100 Sqft and each spot is the average of three single reading, in the single reading i am getting 15, 30, 40 microns but average spot reading is above 70 microns.
Thanks in advance
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