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, Spotsylvania1864)
Yahoo! Groups Links Received on Tue Sep 13 12:17:00 2005
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