RE: Re: Reinforcement Pad Weep hole

From: <Tony>
Date: Tue Sep 13 2005 - 12:17:00 EDT

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.

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From: <a href="/group/PipingDesign/post?postID=MrqQEcJrBSskGF9u_vC1HcPfNeM_M9YPR5hSuHCBMRXw5L1kV-iWoQc86Z76wPqakbjyu4x6V1Y277IC5rlY3yApsW1T0g">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=MrqQEcJrBSskGF9u_vC1HcPfNeM_M9YPR5hSuHCBMRXw5L1kV-iWoQc86Z76wPqakbjyu4x6V1Y277IC5rlY3yApsW1T0g">PipingDesign@yahoogroups.com</a>] On Behalf Of Christopher Wright
Sent: Tuesday, September 13, 2005 11:04 AM To: <a href="/group/PipingDesign/post?postID=MrqQEcJrBSskGF9u_vC1HcPfNeM_M9YPR5hSuHCBMRXw5L1kV-iWoQc86Z76wPqakbjyu4x6V1Y277IC5rlY3yApsW1T0g">PipingDesign@yahoogroups.com</a> 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 <a href="/group/PipingDesign/post?postID=63J1h1sX-r1PLA-hiRZ2cZfC93gVtfxoxqZYArkRmTnETrYwGnIA-V_-d-gLGhgZNoxUxvBaUVgGGdKj">chrisw@skypoint.com</a> | this distance" (last words of Gen.

.......................................| John Sedgwick, Spotsylvania

1864)
<a href="http://www.skypoint.com/~chrisw/">http://www.skypoint.com/~chrisw/</a>

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