RE: CHEMICAL CLEANING FOR NEW PIPLEINES

From: <Misra>
Date: Fri Aug 01 2003 - 00:16:00 EDT

You have not specified the design conditions and the pipe line size. Welded joints can be failed due to many reasons like wrong welding rod material, heat treatment to joints if needed, expansion in line due to temperature, wrong pipe supporting, wrong welding procedure. I hope by looking on these points you will be able to solve your problem. I think small unwanted contaminants & debris are not the cause of failure of welding joints.

Thnaks
Kuldeep Misra

-----Original Message-----
From: e-Director [mailto:segip@tm.net.my] Sent: 01 August 2003 09:36
To: <a href="/group/PipingDesign/post?postID=ZTY6pkfH9uO611aCsVAm1xvmAtpHccat_UpNy5x-bDKgj5OK7o-3Nxq1KFpXW4XZ9RXUyHX80laFm4V7WPVZsJ9o">PipingDesign@yahoogroups.com</a> Subject: [PipingDesign] CHEMICAL CLEANING FOR NEW PIPLEINES

Dear friends,

Recently, during our plant start-up, some of our newly welded joints burst and break-off. To date, there had been no finding to the cause of these problems..
Some of the guys suggested that maybe the welded joint needs to undergo chemical cleaning to remove any unwanted contaminants that may cause flammabality such as oil and grease and other debris inside the pipelines.... The HAZ area inside the welding joint may also cause the welding joint to be weak and also stresses the need for chemical cleaning...

1. Does anyone knows why we need to do chemical cleaning for a new pipelines?
2. Does this chemical cleaning process also need to be done if we do some modification in the lines which involves a lot of welding procedure?
3. Is it possible that without chemical cleaning, there is a danger of explosions?

Thanks

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Your use of Yahoo! Groups is subject to <a href="http://docs.yahoo.com/info/terms/">http://docs.yahoo.com/info/terms/</a> Received on Fri Aug 01 00:16:00 2003