[MW:8169] RE: 8153] repair of erosion on steam turbine casing

As far as ASME Codes are concerned, the turbine island is not considered to be within the scope/under the jurisdiction of these Codes – NOT Sc I, Sc VIII, nor B31.1.  All major turbine manufacturers;  GE, Westinghouse, Siemens, have been zealously defending this historical code break.  Therefore, you are not required by Code to weld to a WPS/PQR - however local authorities, the insurance agency, or the owner may require you to have a WPS/PQR prior to welding.  It is good practice to have a WPS (even if not supported by a PQR) so that your welder(s) know how the weld is expected to be performed. 

 

In regard to the WPS ( other than the turbine island ) if the weld build up is solely to restore thickness, then a suitable groove weld test will be sufficient as long as essential variables are met, particularly base metal thickness. 

 

John

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Azril Johari
Sent: Monday, November 08, 2010 5:57 PM
To: materials-welding@googlegroups.com
Subject: [MW:8153] repair of erosion on steam turbine casing

 

Dear Friends,

We are requested to repair erosion on steam turbine casing. We will have to weld build up and machine back to specified dimension. The material of the casing is GS22Mo4. Client do not dictate any standard to be used.

I have a few fundamental questions:
1. Do we really need a WPS for this work since there is no joining (just weld build up)?
2. If we need a WPS, should we develop WPS using "groove" or "overlay"? We intent to use AWS B2.1.

Hope to get your feedback.

Thank you.

Azril Dahari

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