RE: C.O.G OF PIPES

From: <Aaron>
Date: Tue Jun 01 2004 - 10:17:00 EDT

Assign coordinates to the lines at every change of direction (if not already done) and this can be accomplished. Your best bet is the Excel calc offered by Mr. Wright.

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: Jijoy Pillai [mailto:jijoy@mis.co.ae] Sent: Tuesday, June 01, 2004 8:47 AM
To: PipingDesign@yahoogroups.com
Subject: Re: [PipingDesign] 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
>
>
>
>
>
> =========================================
> PipingOffice - Excel Spreadsheets for Piping Calculations
> http://www.pipingoffice.us/
> =========================================
> Main site: http://www.pipingdesign.com
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
> =========================================
> PipingOffice - Excel Spreadsheets for Piping Calculations
> http://www.pipingoffice.us/
> =========================================
> Main site: http://www.pipingdesign.com
>
> Yahoo! Groups Links
>
>
>
>
>
>

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Main site: http://www.pipingdesign.com

Yahoo! Groups Links Received on Tue Jun 01 10:17:00 2004