Pipeline Isolation joints
Pipeline Isolation joints
(OP)
My pipeline comes above grade in a plant. Between the overbend and the pig trap I have an isolation joint. Does the isolation joint require a spark gap protector ?
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Pipeline Isolation joints
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RE: Pipeline Isolation joints
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: Pipeline Isolation joints
It is also a bit more common to make the trap/launcher integral to the pipeline with isolation between trap/launcher and plant, even though all extraneous connections from the trap/launcher to the plant must be isolated thereafter. Design, installation and inspection, not to mention future operation, of the trap/launcher is often more convenient when included in the pipeline, rather than the plant and maintenance managers don't get confused about who's budget cleaning the pipeline falls under.... IMO.
Let your acquaintances be many, but your advisors one in a thousand' ... Book of Ecclesiasticus
RE: Pipeline Isolation joints
RE: Pipeline Isolation joints
Let your acquaintances be many, but your advisors one in a thousand' ... Book of Ecclesiasticus
RE: Pipeline Isolation joints
RE: Pipeline Isolation joints
Let your acquaintances be many, but your advisors one in a thousand' ... Book of Ecclesiasticus
RE: Pipeline Isolation joints
RE: Pipeline Isolation joints
Anything is a capacitor until it is in a discharge process, ie. steel in a sense is just a very bad capacitor. When charged quickly by lightning, or slowly by product, if the steel is isolated, it can hold charge for awhile. Its a matter of time.
As the product is moving, some charge is given off and some is picked up to balance whatever it is in contact with at the moment. Product at one point can have a different charge from another point. Charge will be leaked as product moves across the isolation joint as well, if the product is a good conductor, then leakage is faster.
"Jet fuel" without antistatic additive and vapor pressure depressents is still basically just a form of kerosene. Antistatic additives degrade with shearing forces, so they are administered just before the actual fueling point.
Let your acquaintances be many, but your advisors one in a thousand' ... Book of Ecclesiasticus
RE: Pipeline Isolation joints