RE: water leak at welded connection

From: <Sajit>
Date: Tue Jul 13 2004 - 23:36:00 EDT

Rick,

Something similar had happened at a facility that I know of.

The pipe ( 6" ) was either 304 or 316. Newly installed, Leaks started after a week after the hydro at most of the welds. The service was just potable water.

The problem was narrowed to a biocide that was used to dose the hydrotest water.

Sajit

-----Original Message-----
From: RICK [mailto:rickb_jp@yahoo.com]
Sent: Wednesday, July 14, 2004 4:17 AM
To: PipingDesign@yahoogroups.com
Subject: RE: [PipingDesign] water leak at welded connection

Bruce and Al,

The pipe material is A312 TP312L sch40 and its size is 6 inches. The joints are butt-welded. Furthermore, its a part of a piping system of a petrochemical plant and of all the piping systems in that particular plant its the only system which manifested that kind of problem. I ruled out the possibility of defects in workmanship since a Welding Procedure Specification is in place, the welders are duly qualified by ASME, and the welding engineer in-charge is an experienced guy who has a Masteral Degree in Welding Engineering from an American University. The piping system mentioned above is a newly-constructed piping system and hydrostatically-tested and retested after rectification of leaks but the problem is recurring. The test media is demineralized water.

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[Non-text portions of this message have been removed] Received on Tue Jul 13 23:36:00 2004