External Loads on a Buried Pipeline
External Loads on a Buried Pipeline
(OP)
Hi All,
I'm trying to figure out a methodology for determining external live and dead loads on a soon to be abandoned 34" pipeline. The concern is that over time as it deteroriates, it will collapse. This pipeline is at various depths and 1102/Spangler's methods are ultra conservative. 1102 says it will never fail and Spangler says that it fails in 2' of cover. These methods are used for designing a pipeline and not for an abandoned line. Any thoughts? Thanks.
I'm trying to figure out a methodology for determining external live and dead loads on a soon to be abandoned 34" pipeline. The concern is that over time as it deteroriates, it will collapse. This pipeline is at various depths and 1102/Spangler's methods are ultra conservative. 1102 says it will never fail and Spangler says that it fails in 2' of cover. These methods are used for designing a pipeline and not for an abandoned line. Any thoughts? Thanks.





RE: External Loads on a Buried Pipeline
My practice has been to use 1102, but with no internal pressure.
Learn from the mistakes of others. You don't have time to make them all yourself.
RE: External Loads on a Buried Pipeline
As you say eventually it will collapse - your problem is you don't know if that is 5 years, 10 years or 20.
what the eco warriors normally don't like is getting holes and water transmission from one part to another then coming out as horrible brown water.
This is not normally an engineering thing, but a legal / regulatory / environmental issue. Depends on your location, regulations, land agreements, current environmental "duty of care", abandonment details etc.
You could always keep the CP on or add lots of sacrificial anodes and turn off the CP system and then hope it doesn't collapse before it becomes someone else problem....
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: External Loads on a Buried Pipeline
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: External Loads on a Buried Pipeline
RE: External Loads on a Buried Pipeline
RE: External Loads on a Buried Pipeline
Even at a lowest 300 psi strength it's 10 X as strong as the original soil ever was.
If the pipe rots, nobody will ever know.
http://www.google.com/url?sa=t&rct=j&q=&am...
Learn from the mistakes of others. You don't have time to make them all yourself.
RE: External Loads on a Buried Pipeline
RE: External Loads on a Buried Pipeline
You still need to seal up your other sections, when the foamed stuff BI has is ideal and generally recognised as fit for purpose in sealing pipes.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: External Loads on a Buried Pipeline