Support saddle

[johg]

We need to fabricate a great number of saddles. The saddles are only support saddles for temporary storage, one or two months to store big pipes (approx 6000 mm, wallthickness 60-80 mm). Should I follow the ASME code or is there another procedure I can follow, so we can construct lighter saddles. The big pipes weigh about 550 metric Tonnes, length up to 60 metres and supported with 2 saddles. Need to support a-symmmetrical, about 2 meter (left) and 20 meters (right). We need to store on saddles due to the storage area.
How lighter, how lower the costs. Any suggestion where I can find some calculation samples beside ASME, Stoomwezen.

Thanks
Johg

 

[PaulV7427]

To be honest, with the size and weight of the pipes that the saddles would be used for, I would not recommend trying to go outside of the ASME code for this. Should the saddles fail, serious consequences could result.

 

[gr2vessels]

johg,
There is a lot more to it than simple saddle design;- those pipes could potentially cause some damage if the saddles fail due to other loads than simply weight.
You need to confirm if seismic loads would apply to these pipes in temporary storage. I assume you don't have the option of setting them on a compacted ground and cover them for some protection (ha, what could possibly harm them, corrosion??).
Any structural saddle would cost both the arms and legs, so it doesn't make sense to design and fabricate heavy structures. Also, you need significant civil work underneath these saddle supports, to prevent them sinking to the center of earth. Instead, some civil work would be cheaper and quicker to set-up for support, without saddles.
Do I read correctly, you are expecting saddle supports for 38m span of pipe? Holly Molly, you need to spray the pipes to prevent the flies landing on them, they'll tip over Europe...I'll try to run a quick test on the PV Elite for a pair of saddles you need, hope the software won't shut down on overload. Can you give us some sizes, OD or ID, thickness and length for the calcs.
I'll come back tomorrow.
Cheers,
gr2vessels

 

[chicopee]

What is the reason for not using dunnage for the heavy pipes and then nailing wedges to prevent rolling?

 

[JStephen]

Depending on what a "great number" amounts to, I would suggest considering finite element analysis to optimize the design. A couple of reasons for this. One, traditional saddle design is very approximate, and is also based partly on empirical tests of "typical" size tanks. Then also the assumption is usually made that the ends are closed, that the tank is loaded by the contents, not by dead weight of the tank, etc. Another option to consider is testing a saddle design with actual pipe.

It may be cheaper to pour concrete saddles on site than to fabricate steel saddles.

 

[johg]

Dear all,

Thanks already for the input. The number of pipes we have to store is about 30 to 40. The dimension left OD 5200 mm, wall thickn. 60 mm, right side OD 6000 mm, wall thickn. 70 mm. In the middle there is a conical section, which we do not want to support.
We need store the pipe about 1300 mm of the ground, due to the use of a multi wheeler. The saddles will be positioned on some concrete supports. Unfortunate dunnage is not possible.
I think we start on calculating according ASME and use Finite Element for refining the structure.

Grtz

Johg

 

[MJCronin]

This is kind of a wild temporary storage configuration....

Pipe lengths to 60 meters, but only two saddles permitted ??? Concrete supports mandatory..??

I agree with Chicopee...Wooden dunnage has been used for virtually all temporary supports for cylindrical "things" in the past....but somehow they are not acceptable here...

How about a sketch of what you envision ???