Center of Graviry in Horizontal Vessel 4

[hamid.njd]

Dear All

I want to calculate the center of gravity location on a horizontal vessel. When I perform mechanical calculations, the PV Elite software shows the location of C.G. in one direction (From Left T.L.).
But the offset of C.G. from the centerline is a question for me. The question is:
"How to calculate the distance of C.G. from the centerline of the vessel?

Thanks in Advance

 

[SnTMan]

Seriously?

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[hamid.njd]

WHAT???

 

[MJCronin]

W O W ......

MJCronin
Sr. Process Engineer

 

[SnTMan]

A + B = C
A = C - B
B = C - A

I know how far it is from home to work, but how far is it from work to home?

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[robyengIT]

if the section has 2 lines of symmetry, then the CG is on the intersection of the 2 lines

 

[Christine74]

I'm assuming that he's asking about the distance to the CG from the horizontal centerline of the vessel. I'm not sure if PV Elite provides the CG elevation as well but it's typically just slightly below the horizontal centerline of the vessel due to the weight of the saddle supports.


-Christine.

 

[SnTMan]

Could be, perhaps I took the OP wrong. Apologies if so.

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

@ hamid.njd
What for?

Regards

 

[hamid.njd]

I might be brought up my question wrongly. But the question is exactly what "Christine74" said.
In PV elite, shows the distance of C.G. in only one direction. For the other direction (elevation of C.G. from horizontal centerline) is any know how to do?

 

[SnTMan]

Yeah, the hard way. See your textbooks, ref centroids, etc.

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

@ hamid.njd
What for?
What do you use the center of gravity for?

Regards

 

[SnTMan]

Yeh, hard to believe lateral CG location is of any particular interest..


The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[hamid.njd]

@r6155 :
The exact location of C.G. is needed for shipping and lifting calculation due to the client's request.

@SnTMan: Thanks. I have checked Dennis Moss and it has been discussed there.

 

[robyengIT]

IMHO you should not allow the client to lift in a different way stated by you. The vessel should have lifting point positioned and designed by you and therefore correct lifting has proper instructions stated by you

 

[r6155]

Most horizontal pressure vessels do not require center of gravity determination for lifting and transportation.

Regards

 

[KevinNZ]

C.G location is used for seismic design of the vessel and foundations. But the C.G calculation does need to include the contents at the operating level during the seismic event.