RE: Re: Butt Welded HDPE Pipe

From: <Al>
Date: Mon May 17 2004 - 13:10:00 EDT

interesting ,

i tried to get the older copper corner fittings that were thicker, but they are unprocurable now.
Used to be they made elbows thicker for this very reason, but the consumer has not noticed the switch.

Altecheng@shaw.ca

001(780)465-9762
Fax/Msg(780)465-9762

-----Original Message-----
From: Christopher Wright [mailto:chrisw@skypoint.com] Sent: Monday, May 17, 2004 9:14 AM
To: ?
Subject: Re: [PipingDesign] Re: Butt Welded HDPE Pipe

>If the flow is turbulent anyway the bead should hardly be of importance.
Be careful in specific circumstances. For cultural value a water line in my home eroded clear through about a year ago. The plumber who fixed it told me that a burr on the cut pipe at the solder joint was responsible. I heard one time that flow velocity affects corrosion for certain metals, copper and copper nickel alloys among them, and it looked like a good example. The burr resulted in a locally higher flow velocity and tubulence which scrubbed the area clean. The joint was at one end of the run of a tee which had been used as a branch connection, so there was additional turbulence caused by flow from the tee branch out through the run. By the time I noticed the pinhole leak which eventually (about 25 years) formed, one whole side of the pipe was paper thin.

I had a neighbor split the joint, and the eroded area extended 2-3 diameters downstream which I figureis about the extent of the major influence of local turbulence due the separation

Christopher Wright P.E.    |"They couldn't hit an elephant at
chrisw@skypoint.com        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)

http://www.skypoint.com/~chrisw

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