Re: [PipingDesign] Moment calculation

From: <Gordon.Reddek@Alcan.com>
Date: Wed Jun 30 2004 - 19:22:00 EDT

Gang,

And yet another way of seeing it:

Imagine the Elbow or Tee with straight pipe attached to each leg lying on a flat table. The table is the plane we are talking about. If the moment on a leg tends to bend the leg so that it lifts off the table or presses into the table, then the leg is bending out of the plant and the moment is known as an out-of-plane moment. If the moment on a leg causes the leg to bend so that it remains flat on the table, then the leg is remaining in the plane and the moment is called an in-plane moment.

Now for the trick questions?
When the moment is a torsion which tends to rotate the whole tee or elbow, is it in-plane or out-of-plane, and does it matter? Can you have in-plane and out-of-plane forces?

Lets hold a feeding frenzy on this one.

Cheers,

Gordon

Gordon Reddek
Specialist Mechanical Engineer
Alcan Engineering, Level 3, 443 Queen St, Brisbane, Qld 4001, Australia. Tel: +61 7 3328 6424
Fax: +61 7 3328 6990
Email: gordon.reddek@alcan.com

"Tony Paulin" <tony@paulin.com>
30/06/2004 03:32 PM
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Re: [PipingDesign] Moment calculation

The concept of in-plane and out-plane, once understood, is simple, but during the process of understanding can be complicated, additionally, there
is often confusion when interpreting pipe stress program results.

Rahul wrote, "The concept of inplane is the moment in the plane in which the
piping is." While this is conceptually correct, the direction the in-plane
moment vector points is normal to the plane of the piping. For example, an inplane moment for an elbow or tee defined geometrically, completely in the
X-Y plane, points in the Z direction, or in a direction that is "out-of-the-plane" of the geometry. Out-of-plane moments for a 90 degree elbow running in the X and Y directions are in the X direction for the Y leg, and in the Y direction for the X leg. Out-of-plane moments for a 90 degree branch connection whose header is in the X direction and whose branch
is in the Y direction are in the X direction for the branch, ann in the Y direction for the run. If the branch is a lateral then there are several possible interpretations for the out-of-plane direction, while the in-plane
moment direction is clear.

Regards,
A.Paulin

> Yes, I agree with Rahul. The classical book under
> reference is "Kellog". Good luck!
> Regards.
> C. V. Gangadharan.
> --- Rahul Kulkarni <rdk77@yahoo.com> wrote:
> > Hi
> > The concept of inplane is the moment in the plane in
> > which the piping is. and Out of plane is
> > perpendicular to that.
> > It is like the bending moment is resolved in to
> > these two components.
> > The methods you are reading are bases on bisic SOM.
> > But the methods now a days are used are based on
> > single dim. FEA. Caser II is the software best for
> > the application.
> > Calog (i hope the spell is correct) is the best
> > book. One of the topic towads the end of the book
> > explains the method in short.
> > Rahul
> >
> >
> >
> > RAHUL DEEPAK KULKARNI
> > GHARKUL 36 MANISHANAGAR
> > PANDHARPUR
> > PIN 413304
> > RDK77@YAHOO.COM
> >
> > ---------------------------------
> > Do you Yahoo!?
> > Yahoo! Mail is new and improved - Check it out!
> >
> > [Non-text portions of this message have been
> > removed]
> >
> >

>
>
>
>

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[Non-text portions of this message have been removed] Received on Wed Jun 30 19:22:00 2004

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