RE: [MW:6514] PWHT for carbon steel piping system working with H2S to perform welding repair

Hi,

 

In the viewpoint of PQR, The holding time of PWHT shall cover min. 80% of production holding time of PWHT  based on ASME Sec. IX

 

Generally three times of Simulation test is executed to guarantee the mechanical properties of base material. In case of carbon steel, simulation PWHT is not mandatory according to ASME Sec. VIII Div.1,. But sometimes job (project) specification requires three times simulation PWHT regardless kind of material.

 

Please refer to below why three times is required.

 

1) One time for original PWHT at shop.

2) One for repair at shop

3) One for repair at site.

 

Regards,

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Kathalingam Babu
Sent: Monday, August 16, 2010 3:47 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:6510] PWHT for carbon steel piping system working with H2S to perform welding repair

 

Hi

 

Pls follow the project specification.

 

Since the NACE MR-0175. states ,the condition for which NACE MR-0175 is used, you have to fulfill the requirement of Hardness.

 

For example, if you face 2 repairs on the same location, you have fulfill the 22HRC Max. requirement after 2 repair by welding Procedure.

 

Regards,

 

K.Babu

Singapore

 

----- Original Message -----

From: guttemberg.souza

To: materials-welding@googlegroups.com

Sent: Thursday, August 12, 2010 11:49 AM

Subject: [MW:6452] PWHT for carbon steel piping system working with H2S to perform welding repair

 

Dear All,

I would like to know about the procedure regarding welding repair in carbon steel piping system that work with products containing H2S. I have received the information that we have to perform three cycles of heat treatment on the test piece used to qualify the welding procedure in order to use this test to perform welding repair on the joints and the number of the cycles means the quantity of repair allowed on the production welds.

Is this procedure correct ? Is this procedured valid only for some groups of materials ? Is there any rule governing this action ? 
 
Could you kindly help me in this query ?

Guttemberg Souza

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