RE: [PipingDesign] Small Bore Pipe Bending and Shop Fab

From: <Richard>
Date: Thu May 15 2008 - 02:18:00 EDT

Hi,
I know that in the pharmaceutical and food processing industries butt-weld small bore stainless is the norm, to avoid pockets where bacteria and corrosion can occur. But in petro-chem we've commonly never worried about this and I've always primarily used carbon steel socket weld or threaded fittings in small bore. There must be a good reason? I always thought it was because of fit-for-purpose, i.e. cost effective, design. Aren't small bore socket weld and threaded pipe and fittings relatively easy to erect and forgiving in alignment?. Versus the cost of pipe bends and butt-weld?

Don't get me wrong. I am still holding to the idea that small bore can be done efficiently in the shop. But now I'm enquiring about the cost of socket weld fittings and socket welds versus pipe bends and butt-welds.

Richard B.
Calgary, Canada

-----Original Message-----
From: PipingDesign@yahoogroups.com [mailto:PipingDesign@yahoogroups.com] On Behalf Of Christopher Wright
Sent: May 14, 2008 9:14 PM
To: PipingDesign@yahoogroups.com
Subject: Re: [PipingDesign] Small Bore Pipe Bending and Shop Fab

On May 14, 2008, at 9:52 PM, Paul Bowers wrote:

> What other considerations should there be for replacing thick wall,
> field socket-welded piping with bends and shop butt-welding?
Corrosion in the crevice formed between the socket ID and the pipe OD. That's a serious consideration for stainless. Christopher Wright P.E. |"They couldn't hit an elephant at chrisw@skypoint. <mailto:chrisw%40skypoint.com> com | this distance" (last words of Gen.

____________________| John Sedgwick, Spotsylvania 1864)

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

[Non-text portions of this message have been removed] Received on Thu May 15 02:18:00 2008