Re: C.O.G OF PIPES

I am having the piping drawings in Autocad 2002. But it is 2D drawings. They are not solids. Also I am having the isometrics of all drawings. Is there any easy way by which I can find the C.O.G and weights. In fact I can get all the weights in the BOM. But how to get C.O.G

Thanks in advance
JIjoy.
----- Original Message -----
From: <awolfe@muel.com>
To: <PipingDesign@yahoogroups.com>
Sent: Tuesday, June 01, 2004 5:06 PM
Subject: RE: [PipingDesign] C.O.G OF PIPES

> If you are using any AutoCAD based Piping design software it can easily
> be calculated. First get your piping into the neutral ACIS format.
> Perform the command MASSPROP and select the Piping that you want to know
> the COG of.
> It will output something like this:
>
> ---------------- SOLIDS ----------------
>
> Mass: 8656.47243 lb
> Volume: 8656.47243 cu in
> Bounding box: X: 289.62640 -- 528.45536 in
> Y: 306.07426 -- 332.88676 in
> Z: -5.50000 -- 5.50000 in
> Centroid: X: 403.71350 in
> Y: 310.79544 in
> Z: 0.00000 in
> Moments of inertia: X: 836374238.43652 lb sq in
> Y: 1454812878.88051 lb sq in
> Z: 2291138653.50112 lb sq in
> Products of inertia: XY: 1084846436.51312 lb sq in
> YZ: 0.00000 lb sq in
> ZX: 0.00000 lb sq in
> Radii of gyration: X: 310.83495 in
> Y: 409.95208 in
> Z: 514.46426 in
> Principal moments (lb sq in) and X-Y-Z directions about centroid:
> I: 173960.13929 along [0.99956 -0.02972 0.00000]
> J: 43979940.70730 along [0.02972 0.99956 0.00000]
> K: 44105437.03069 along [0.00000 0.00000 1.00000]
>
>
> The Centroid is what you're looking for. The other information is not
> correct as AutoCAD ACIS solids do not take into effect density,
> material, etc. But the COG is correct.
>
> Regards,
>
> Aaron Wolfe
> Piping Designer
> Paul Mueller Company
> P.O. Box 828
> Springfield, Mo 65801
> (417) 575-9780
> E-mail: awolfe@muel.com
>
>
> -----Original Message-----
> From: Jagarlamudi.Suresh@ril.com [mailto:Jagarlamudi.Suresh@ril.com]
> Sent: Tuesday, June 01, 2004 3:48 AM
> To: PipingDesign@yahoogroups.com
> Subject: Re: [PipingDesign] C.O.G OF PIPES
>
>
>
>
>
>
> are you working on Caesar II or any other software?
> If you are working on Caesar II then you will get C.O.G of the system in
> different cases while checking of your error and warning report as
> well
> as you will get this information in output report also.
> In output report it is in miscellaneous data as given below
> CAESAR II C.G. REPORT FILE:DB057A00._P
> Total Wght X cg Y cg Z cg
> ------------------------------------------------------------------------
> ------
> (N. ) (mm.) (mm.) (mm.)
> Pipe : 616068.6 42072.5 49200.0 -30980.2
> Insulation : 0.0 0.0 0.0 0.0
> Refractory : 0.0 0.0 0.0 0.0
> Fluid : 966795.6 40285.5 49571.0 -30255.0
> Pipe+Insl+Refrty : 616068.6 42072.5 49200.0 -30980.2
> Pipe+Fluid : 1582862.6 40981.0 49426.6 -30537.3
> Pipe+Insl+Refrty+Fluid: 1582862.6 40981.0 49426.6 -30537.3
>
> If you are not using Caesar II you can calculate it by manual
> calculations.
> X =W1*x1+W2*x2+..../(W1+W2+...)
> Y =W1*y1+W2*y2+..../(W1+W2+...)
> X and Y are C.O.G point coordinates.
> x1,x2,.. are x coordinates of C.G of each pipe segment.
> y1,y2,.. are Y coordinates of C.G of each pipe segment.
> W1,W2,... are weight of each segment.
> The above is for 2D plane calculation like Same way we can calculate for
> 3D
> with addition of Z coordinate to the above.
> In the above calculation you must consider all straight pipes,elbows and
> reducers.
> For straight pipe C.G is at centre of the pipe.
> For 90 and 45 degree elbows it is interms of Radius.
> For finding the C.O.G in 3D you must draw different views in different
> planes and calculate it by using above said method.
>
> I think this information may help you.
> From
> suresh.J
>
>
>
>
>
> =========================================
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> http://www.pipingoffice.us/
> =========================================
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> =========================================
> PipingOffice - Excel Spreadsheets for Piping Calculations
> http://www.pipingoffice.us/
> =========================================
> Main site: http://www.pipingdesign.com
>
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Received on Tue Jun 01 09:47:00 2004