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#12731 - 08/18/07 05:26 AM Pitch & Roll Loading
Naren Offline
Member

Registered: 08/14/07
Posts: 47
Loc: Qatar
Dear All,
Can sombody explain "Pitch & Roll Loading" on piping system.

Regards,
Naren

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#12734 - 08/18/07 10:14 AM Re: Pitch & Roll Loading [Re: Naren]
Richard Ay Offline
Member

Registered: 12/13/99
Posts: 6226
Loc: Houston, Texas, USA
When a floating body (a ship or a barge) floats in a wave train, it is subjected to inertial (acceleration) loads as it (the body) responds to the altering free surface. "Pitch" is the rotation (up and down) of the bow (front) and stern (back) about the center of the body. "Roll" is the rotation (side to side) about the long axis of the body.

Typically, piping systems subject to pitch and roll are analyzed using "static equivalent" methods where the loading is a "g" factor.
_________________________
Regards,
Richard Ay - Consultant

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#42451 - 04/16/11 09:35 PM Re: Pitch & Roll Loading [Re: Richard Ay]
FaizAriff Offline
Member

Registered: 04/16/11
Posts: 5
Loc: Kuala Lumpur, Malaysia
Hi,

If the given values of pitch and roll were in ''degrees"?, how do i change it into g terms?

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#42494 - 04/19/11 02:38 AM Re: Pitch & Roll Loading [Re: FaizAriff]
danb Offline
Member

Registered: 04/22/05
Posts: 1453
Loc: ...
It is a little bit complicated, naval engineer should give you the values.

Regards,
_________________________
Dan

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#42522 - 04/19/11 03:28 PM Re: Pitch & Roll Loading [Re: danb]
Crusader911 Offline
Member

Registered: 11/22/09
Posts: 25
Loc: Louisiana, USA
I just went through this, and you really need to request the g-factors and put them in as uniform loads. I expended a lot of effort trying to put in rotational deflections and could not get it to work properly. Save yourself some time and look for a recent thread where I documented my problem and the help I was given.

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