DFT ACCEPTANCE AND REJECTION OF PAINTING.

[manoj john]

Dear All,

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 

Manoj John.

[madhan chozhan]

Dear John,

As per SSPC PA2 the minimum required thickness is 80% and maximum 120% of the required DFT for a single spot measurement.

as in your case 60 micron should be the min and 90 micron should be the max, hence it is not acceptable.

regards,

madhan

--
To post to this group, send email to material...@googlegroups.com
To unsubscribe from this group, send email to materials-weld...@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.

[haseeb ph]

Dear John,

as per SSPC PA2 we can acept 80-120%, but in your case even you are
getting average 70 microns as per SSPC PA2 it is acceptable, but as a
good workmanship how can you accept a reading of 15, 30, 50 microns.
so for better corrosion protection and good workmanship it should be
rejected.

Thanks.

Haseeb

[Ramchandra vichare]

Dear friend,
 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.

Regard,
RK Vichare



--- Original Message -----

From: manoj john

To: material...@googlegroups.com

Sent: Mon, 3 Oct 2011 09:07:13 +0530 (IST)

Subject: [MW:12607] DFT ACCEPTANCE AND REJECTION OF PAINTING.