Construction of pipework
Construction of pipework
(OP)
We have a section of pipework which is 9 tons in weight. it has to be lifted into position along with 4 2 ton tanks. The pipe is 300DN. We have to put in 2 runway beams for the purpose of construction. Would it be cheaper to chop the section of pipework up int 4 pieces and lift them up with smaller lifting equiptment or design the lifting beams for 9 tones and lift it in one go?





RE: Construction of pipework
If I assume you mean "tonnes" instead of "tons" (since you specified 300 DN instead of 12-inch), then you are talking about 14-15 joints of standard wall pipe. We lower that length with 3-4 side booms all the time, no big deal. If you have to lift it very high or with a considerable boom then it will be pretty expensive to stage 3-4 50 ton cranes to set it in place, but that might be less expensive than cutting it up and re-testing it (is your pipe rack adequate for a new hydrotest?)
David Simpson, PE
MuleShoe Engineering
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RE: Construction of pipework
Will the heavy lifting equipment be cheaper than chopping the pipe work up, testing it (ndt). Yes we have to squeeze it and possible helium test it
RE: Construction of pipework
With respect, I really don't understand how anyone can actually give you any guidance on such a complex question with no drawings or pictures. If you chop the pipework into sections how are you going to weld it back together some 11 m in the air??
Sorry, this one just sounds too hard.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Construction of pipework
1. Design the lifting beams to take 9 tonne and lift it as one section
2. Design the lifting beam to take 4.5 tonne and cut the pipework in 2 pieces and lift (creating an additional but welds and lifting man hours
3. Design the lifting beam to take 2.5 tonnes and lift the pipework in 4 sections (again creating additional butts and lifting man hours)
Remember this is a one off lift