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[MW:12914] RE: 12900] Super duplex welding

By Materials & Welding

Dear LEE,

 

Hope the attachment will help you.

 

Regards,

 

John

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of sanggyu LEE
Sent: Wednesday, November 09, 2011 1:47 PM
To: materials-welding@googlegroups.com
Subject: [MW:12900] Superduplex welding

 

DEAR expert..
I would like to know if FCAW is applicable for super duplex ss for seawater service...
Thanks
sglee

2011. 11. 3. 오후 8:53에 "Vasantharao Pamula" <vasantharao@yahoo.in>님이 작성:

Dear experts,

 

Can anybody give  me guidance to accept the paint for next coats.

 

I work as inspector, i need to clear the painted pipes (primed) for 2nd coat.

 

When i  go for inspection, contractor offered to me 1st coated  pipes ( Jotun paint  -Barrier  comp.A,   DFT required is 75Microns as per specification).

 

I observed a situation that contractor applied 1st coat, in few areas, patch-up work (repaint) has been done to get the required  75 microns.

 

When i touch the paint, it looks to me that paint has not  dried. contractor claims that paint is applied 6hrs back, per data sheet of that paint 3h is enough for repainting.

 

Now problem is contractor is asking me to clear the 1st coat for next coats ( Pipe undergo 4 coat paint system). I objected it as it looks  paint is not dried.

 

Queries

 

 1. Patch-up work is allowed on 1st coat?

 

2. What is the min. & max. paint thickness allowed (75 Microns is nominal).

 

3. What is the testing method to clear the paints  for next  coats.

 

4. For Drying time, we should refer only  painters data sheet?

 

5. When will be used tape bonding testing ( ASTM D 3359).

 

 

Thank you in advance

 

Rao.

 

08297552539

 

 

 

 

 

 

 

 

 

 

 

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