Wednesday, August 18, 2010

Re: [MW:6551] pwht for service vessel

Hi,

As per Code,Welding of pressure part cannot be done after PWHT.

But there is an option is that,you can weld the non pressure part to pressure part with fillet weld and the throat thickness should not exceed 13mm and also you have to do preheat with minimum 95 degree celcius,

If you meet the above criteria on your weld..you dont need to do PWHT again.


Thanks & Regards,


(Karthik)


Karthikeyan.S
 
Getabec Energy Co.,Ltd.
379,Moo6,Soi8,Nikhomphatana,
Rayong-21180,
Thailand.
Phone: 0066 38 897035-8 (Off)
Fax: 0066 38 897034
Hand Phone: 0066 892512282


--- On Wed, 8/18/10, sunilrathoreps@yahoo.com <sunilrathoreps@yahoo.com> wrote:

From: sunilrathoreps@yahoo.com <sunilrathoreps@yahoo.com>
Subject: [MW:6549] pwht for service vessel
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Date: Wednesday, August 18, 2010, 12:24 AM




Dear all

I have an vessel which is pwht as per service requirement,mention in note not to weld on pressure part after pwht cycle ,but we want cement lining inside the vessel up tp half portion to do this we have to put wire mash for lining to do this we have to weld this mesh with vessel , my  doubt is that is this required pwht ?even this mesh weld will nt be in contact with servic after lining . Vessel mat is kcs with 34mm thk.

Regards

Sunil singh

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