54' 1 piece rig of pipe 10

[010867]

Does anyone know if I can rig a piece of pipe 24"round x 54'long in one piece, without crushing? Pipe is sch.10 .250 thickness and comes in 20' lengths. It will be welded with 6011 x 3/16" welding rod.

 

[desertfox]

Hi 010867

I think it will be more of a bending issue depending where
you take the lift points from.
Safest bet would be lift them in some sort of cradle.

regards

desertfox

 

[GregLamberson]

010867

It will not be a problem unless for some reason you have zero tolerance for fress stress bends in your pipe.

You can fix 2 points along the pipe as lift points equidistant from the center point.

The whole question is will the stresses imposed by lifting exceed a percentage of SMYS of the pipe - which your governing code will determine what that % is, the tensile strength of the pipe will be the key factor, but in any case, you should not have to worry.

Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website:

http://www.oil-gas-consulting.com

 

[civilperson]

Lift points at 0.20625L from the ends give approximate equal bending moments at center and lift points.

 

[EdStainless]

Why not use a spreader beam and lift from four or five points? I am not worried about bending stresses, I am concerned with buckling.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[010867]

Sorry people, I left out a inportant step, this needs to be rigged from a single pick from the top..

 

[desertfox]

Hi 010867

I think that it will be unstable on a single pick and extremely dangerous.

Regards

desertfox

 

[civilperson]

If the cable leads are longer than 32 feet from the hook to the strap around the pipe, the compression force in the center between the straps will be less than 2 kips and the tension in the leads about 2 kips each. Easy pick if the height of the boom is 29 feet higher than the greatest lift elevation. (Estimated lift weight is 3500 pounds plus rigging).

 

[seaner]

I talked to 010867. And the reason he needs to pick it up straight from one end, is that he has to set it down a hole.
He has a tall enough crane. But We are not sure the best practice for this pick?

 

[seaner]

Also I think the pipe is 24" Diameter.

 

[desertfox]

Hi 010867

Ah!I thought you were still lifting horizontally.
Lifting from one end wouldn't cause buckling which made me think you were lifting horizontally,anyway can you attach some temporary hooks or flange to your pipe which could be cut off after its inserted into the hole.
A bit more detail of what your trying to do might help others give you an answer.

regards
desertfox

 

[WmacG]

If the pipe is laying flat before you pick up one end, it will have bending stresses on it until it is upright. I would check the bending stresses during erection and the attachemt method. You can pick up the pipe from somewhere other than the end to reduce the bending stress, but then it wont hang verticle. What is the wall thickness of the pipe? You might want to take precautions to protect the other end of the pipe at the begininning of the lift where it could be supporting 1/2 the weight of the pipe.

 

[ewh]

I don't know if this is possible, given my limited knowledge of the subject matter, but is there some way you could attach to both a cradle and the pipe, lifting the cradle into vertical position, applying tension to the pipe, then lowering the cradle, leaving the pipe hanging vertical?
Or perhaps using a sectional pipe of larger diameter as a cradle, lowering it as sections are removed when vertical?
Both of these methods would require separate control of the cables.

Believe it if you need it or leave it if you dare. - [small]Robert Hunter[/small]

 

[GregLamberson]

010867

This will not be a problem, we lift double joints (80' in length) up to 48" dia at a single point (center point). 24" is not a problem, especially picking from the end. Sling it up and lift it in to place.

Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website:

http://www.oil-gas-consulting.com

 

[seaner]

WmacG:
The pipe is sch.10 .250 thickness stainless.
It is going to have two welded joints and it can have a temporary rigging welded to it.
Then it needs to be picked straight up and set down into a pit.
Thanks

 

[desertfox]

Hi 010867
I used a free online calculator at this site:-

http://www.engineeringtoolbox.com/beam-stress-deflection-d_1312.html

I assumed it was a simply supported beam with a uniformly distributed load.
Whilst this ignores the fact at the start of lift, the beam would not be quite horizontal, or that the end on the floor would need to be prevented from sliding which introduces horizontal forces and reactions parallel to the beam during the lift I felt it would give an insight to the stresses and deflections at the start of lift.
The results are posted below:-

Beam Stress and Deflection
Unit Load - q : 5.28 (lb/in)

Total Load : 3421 (lb)

Length of Beam - L : 648 (in)

Moment of Inertia - I : 418 (in4)

Modulus of Elasticity - E : 29000000 (psi)

Perp. distance from neutral axis - y : 12 (in)



Support Force - R1 : 1711 (lb)

Support Force - R2 : 1711 (lb)

Maximum Stress - ? : 7956 (psi)

Maximum Deflection - ? : 1 (in)

regards

desertfox