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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsOil Refinery Co...Oil Refinery Co...welding of ASTM A 106 piping to ASTM A234 WP 22welding of ASTM A 106 piping to ASTM A234 WP 22
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7/14/2008 9:00 AM
 
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Hi I am a new member of this forum. There was an elbow failure in a kerosene recovery unit due to impingement . I have suggested use of ASTM A234 WP 22 ( 2.25 Cr 1 MO) in place of A234 WPB. The exixting piping is A-106 Gr B. Will there be any galvanic problem between these two metals and how to weld these carbon stees and low alloy steel
 
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7/14/2008 9:00 AM
 
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Manshumi Before welding A 234 WP 22 fitting with A 106 B or before replacing , analyze why the A 106 B fitting failed due to impingement. Is it due to high impingement velocity? Is it due to throttling of valves or some other orifice in between in the system> Is it originally designed in a way that the velocity in the system is higher than rated for A 106 B? Welding A 234 WP 22 is no problem provided you choose appropriate welding electrode for WP 22 alloy grrade and not for A 106 grade . Also take the necessary precaution with proper pre and post heat treatement for and after welding. There will be no galvanic effect between two ferrtic grade steels. Hope this helps you C.V.Srinivasan Nishi Engineers Pvt Ltd India July 15,2008 E-mail: nishi@vsnl.com >Hi I am a new member of this forum. >There was an elbow failure in a kerosene recovery unit due >to impingement . I have suggested use of ASTM A234 WP 22 ( >2.25 Cr 1 MO) in place of A234 WPB. The exixting piping is >A-106 Gr B. Will there be any galvanic problem between these >two metals and how to weld these carbon stees and low alloy >steel
 
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