Re: New at PipingDesign.com: 01 June 2001

From: <Christopher>
Date: Fri Jun 01 2001 - 00:48:00 EDT

>Does anyone remember why an engineering drawing of a vessel should
>always be dimensioned from the theoretical tangent line of a 2:1
>semi-elliptical head and *not* from the weld seam?
I always heard that you should dimension from a recoverable feature like a line--weld joints tend to get smeared out because they're not a line. It seems like a somewhat bigger pain in the ass dimensioning from tangents because you need to know the actual straight flange length in order to lay out the vessel shell to give you the proper overall length.

Christopher Wright P.E. |"They couldn't hit an elephant from <a href="/group/PipingDesign/post?postID=55-_P5ybrHfh9dt0uD47rpvD3nICVX3353Jvkbi7eYeYqgjKOSLraG9qvxYrVjgzzguRJgKSPc5deXI">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 Fri Jun 01 00:48:00 2001