RE: Re: Reinforcement Pad Weep hole

From: <elie>
Date: Tue Sep 13 2005 - 17:30:00 EDT

It is a standard requirement that a complete welding pass must be completed before shutting down the job.

Tony Paulin <tony@paulin.com> wrote:When we've seen this happen, the weld was started one day, and finished
another, allowing water to collect in the pad/vessel space. Evaporating water during PWHT caused bulging.

-----Original Message-----
From: PipingDesign@yahoogroups.com [mailto:PipingDesign@yahoogroups.com] On Behalf Of Christopher Wright
Sent: Tuesday, September 13, 2005 11:04 AM To: PipingDesign@yahoogroups.com
Subject: Re: [PipingDesign] Re: Reinforcement Pad Weep hole

On Sep 13, 2005, at 12:53 AM, tomcruz55 wrote:

> A RP was welded without the
> weep hole. Pad bulges.

Are you sure it bulges from trapped air or from welding heat distortion? The faying surface beween a pad and the vessel wall can't possibly trap air until the last bit of weld is applied, and if the air is warm, it soom cools. Takes a helluva lot of pressure to bulge a doubler plate.
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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[Non-text portions of this message have been removed] Received on Tue Sep 13 17:30:00 2005