Pipeline wall thickness for full vacuum
Pipeline wall thickness for full vacuum
(OP)
Hello,
There is a 36" 6km long crude oil pipeline. Thickness is 9.5mm with 3mm corrosion allowance.
How do I verify if this thickness is sufficient for full vacuum condition?
Thanks,
There is a 36" 6km long crude oil pipeline. Thickness is 9.5mm with 3mm corrosion allowance.
How do I verify if this thickness is sufficient for full vacuum condition?
Thanks,
Never forget what you are. The rest of the world won't. Wear it like an armor and it can never hurt you.





RE: Pipeline wall thickness for full vacuum
RE: Pipeline wall thickness for full vacuum
It will be ok.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pipeline wall thickness for full vacuum
RE: Pipeline wall thickness for full vacuum
XL83NL and KevinNZ,
Design code is ASME B31.4. It does not lead me to ASME BPV VIII Div1 UG 28. Only ASME B31.3 does. But my pipeline is not as per ASME B31.3. Even if I follow ASME VIII Div1 UG 28, what will be the value of L in L/D?
Thanks for your responses.
Never forget what you are. The rest of the world won't. Wear it like an armor and it can never hurt you.
RE: Pipeline wall thickness for full vacuum
RE: Pipeline wall thickness for full vacuum
But should I really follow Section VIII here?
Thanks.
Never forget what you are. The rest of the world won't. Wear it like an armor and it can never hurt you.
RE: Pipeline wall thickness for full vacuum
you need to calculate a fair number of items, but it's a recognized pipeline code.
If you're taking the min wt as 6.5mm, that's a D/t of 150 - pretty thin.
I think that's a bit excessive though, both as a CA and to remove the entire wt from the pipe calc.
You may well be in trouble at that sort of thickness.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pipeline wall thickness for full vacuum
RE: Pipeline wall thickness for full vacuum
31.4 states in a number of places that the pipe shall be designed with a margin of safety over buckling, but doesn't tell you how to do it....
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Pipeline wall thickness for full vacuum
Never forget what you are. The rest of the world won't. Wear it like an armor and it can never hurt you.
RE: Pipeline wall thickness for full vacuum
multiplied to 36" gives a value of around 7mm.
Also this doesn't take into account any other forces, moments or axial stress, all of which could impact the final number.
apparently API RP 1111 has a formulae as well. Tried that and got a collapse pressure for 6mm pipe of 18 psi, but allowable is 0.7 of that so 13.2 psi.
http://fianagusta.blogspot.co.uk/2012/02/pipe-wall...
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.