Re: B31.1 SV Nozzle Design

From: <Christopher>
Date: Tue Feb 13 2007 - 21:54:00 EST

On Feb 13, 2007, at 10:15 AM, Bob wrote:
> I'll try to be brief but would like to introduce myself. I am Bob
> Goodwin and the Quality Mgr. for a medium size pipe / vessel
> fabricator in OH.

Thank God. I thought US vessel fabricators went the way of the ivory-billed woodpecker… Good to hear from you.

> I am comfortable with reinforcement and internal pressure
> calculations however I have been told that the nozzle design must
> also be adequate for 6000 psi moment of thrust from valve discharge.
> My two questions are as follows:

In general there won't be any specific rules for nozzle loading because it's too general a topic. Normally what's done for local loading is some variation on WRC-107 for figuring local stresses on cylindrical and spherical shells. Some Code software has this procedure built in, but I don't know about yours. You can actually use the process shown by WRC-107 with a spreadsheet--the arithmetic is tedious but there are examples in the report.

The other alternative is FEA, but you can probably lear what you need from WRC-107.

Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=Qi3pCXP0it4afk12e_wA6N70ub4kI-QwihYPFoUntUoNOazcOeItQhNixBRw9JFEo8PkF3bXeuCqayECXA">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>

Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=Qi3pCXP0it4afk12e_wA6N70ub4kI-QwihYPFoUntUoNOazcOeItQhNixBRw9JFEo8PkF3bXeuCqayECXA">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> Received on Tue Feb 13 21:54:00 2007