Load necessary to lift pipeline 1

[mechmaj]

Dear Friends,
I want to know how can i estimate the crane capacity necessary to lift a pipeine.
Our project is to lift a pipeline (on sleeper) and put some supports to increase the elevation about 500mm.
Now, I want to calculate the necessary ifting force (Crane Capacity).
The line is 24" sch160 C.S.

Thank you all in advance.

 

[BigInch]

No. You need to calculate how much of the line you can lift without damaging the pipe and prohibiting its use in future. You shouldn't lift more than the natual sag limit, so for estimating purposes you must plan on supporting something like the natural arc of the incremental lift height x 180, but its a guess that needs to be verified by a stress analysis.

According to that guess, that can be accomplished by lifting 90 ft by a 6" height, shoring it up, moving to the next 90 ft span, lifting that one 6" and so on, then returning to the first segment and repeating it until the entire line is lifted.

That pipe weighs 397 lbs/ft, another 87 lbs/ft with water inside, plus weight of coatings if any. So, assuming empty and no coating, say 100 ft x 400 lbs/ft = 40,000 lbs plus crane capacity.


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"Pumping systems account for nearly 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[JohnBreen]

Great reply BI

John

 

[mechmaj]

Dear BigInch, Thank you for your reply.
Very helpful answer.
please let me know if i am true:
The pipe 24inch sch. 160 is 542.13 lb/ft.
for puting the 500 mm support it is necessary to lift the line at least 2ft, so the lifting capacity is:
2x180x542.13=195167 lb
Thank you very much.

 

[BigInch]

No. Please read my first answer again.... slowly.

The pipe alone is about 400 lbs/ft plus weight of fluid inside + coating, if any.

Do not lift more than a 90 ft length, and do not lift that section more than 6" high during one lift.

Then move to the next 90 ft length and lift that.

Verify the above procedure by a stress analysis.

*************
(Thanks John)

**********************
"Pumping systems account for nearly 20% of the world’s energy used by electric motors and 25% to 50% of the total electrical energy usage in certain industrial facilities." - DOE statistic (Note: Make that 99.99% for pipeline companies)

http://virtualpipeline.spaces.live.com/