Re: C.O.G OF PIPES

From: <Christopher>
Date: Sun May 30 2004 - 13:44:00 EDT

>I have a network of pipes inside a rig. And I want to find the C.O.G (Center
>of Gravity) of these pipes. Is there any easy method or any software which
>will help me do this.

Easy as rolling off a log with Excel:
Set up columns as follows with the weight and CG of each span. Name each column (Formula>Define Name...) as indicated Column A Weight

Column B     Xcg
Column C     Ycg
Column D     Ycg

Sum the weights =SUM(Weight) and name the total Wtot. =SUM(Weight*Xcg)/Wtot will give you the the X location of the CG. Use similar formulas for the Y and Z coordinates.

If you want to spend a little more time to have something you can use over and over, add columns identifying each span and the weight/foot with the beginning and end points and automate the weight and CG calculation. You can get really cool and make the calculation into a workbook and get the weight/foot value from a look-up table or include the incremental Wt/ft for contents and insulation.

Christopher Wright P.E. |"They couldn't hit an elephant at <a href="/group/PipingDesign/post?postID=th8hWHttDqEMqHp-Uoo7efod5BqRe5Ihq1QB-SbAjtVrqlkvSWPPasbKXC_WsSAUVN9GhU0JIbjq">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 Sun May 30 13:44:00 2004