NGL Pipelines

[Strawb]

We have a new job - to build and commission a NGL Pipeline.

Never done this before. Crude Oil, yes. Gas, Yes.

IN order to stop teh NGL evaporating on injection into the line I guess we have to pre-pressure it.

Anybody commissioned a NGL Pipeline? Tips, hazards etc?

Replies appreciated.

 

[STYMIEDPIPER]

Try posting your inquiry in the 'Piping & Fluid Mechanics Engineering' forum.

 

[MortenA]

This may sound like im envious - but im not going to help you doing your job for free.

If you you have a specific question then i may help you - but this is ridiculus (in my mind).

BTW: Yes you can elevate the preesure in the line and avoid evaporation of the fluid while its being pumped in the line.

Best regards

Morten

 

[JLSeagull]

Maintain backpressure from the receiving end of the pipeline.

 

[Montemayor]

I can't generate enough empathy or pity for any "manager" or vp of a P/L company that is willing to release a contract for an NGL P/L to an engineering firm that has no experience in that application.

I know we are all presently under-staffed and starved for experienced resources, but that kind of decision is bordering on the dangerous side - economically and operationally (& also on the ridiculous, as Morten states).

 

[Latexman]

IN order to stop teh NGL evaporating on injection into the line I guess we have to pre-pressure it.

Maybe, and maybe not. Have you calculated the bubble-point temperature of your NGL (Don't most folks call it LNG, or is that a U.S. thing?) to see how close it is to the two phase envelope?


Good luck,
Latexman

 

[dcasto]

Like MortenA, have your client tell you the specifications they require, if they say they have none, then go out and buy a new house and laugh all the way to the bank. They need to list their requirements, like can you vent or flare product. Can the NGL be wet or dry or have freewater.

Then have the client list available storage or gas systems available. List if they have some NGL that can be used and recylcled.

Then ask for some guideance.

If the line has some rises, you know the drill on pressures, becarefull.

 

[JLSeagull]

NGL is not LNG.

LNG is liquified natural gas - essentially liquified methane at cryogenic temperatures for trans-ocean shipment from places like Algeria.

NGL includes ethane, propane, butane and heavier liquids extracted from natural gas. Extracting the hydrocarbon liquids also removes water moisture as part of the natural gas processing for pipeline gas sales. The pressurized ambient temperature ethane, propane, butane and heavier liquids are fractionated and sold as products.

 

[Latexman]

So it's Natural Gas Liquids?

Good luck,
Latexman

 

[JLSeagull]

Sorry, you are correct. NGL is natural gas liquids. Some will also describe as gas products.

 

[MJCronin]

all..

NGL (natural gas liquids) - "Portions of natural gas that are liquefied at the surface in lease separators, field facilities, or gas processing plants, leaving dry natural gas. They include, but are not limited to, ethane, propane, butane, natural gasoline, and condensate."

Also see:

http://www.teachmefinance.com/Scientific_Terms/Natural_gas_liquids_NGL.html

-MJC

 

[mbeychok]

Better yet, if you really want to learn more about Natural Gas Liquids, this article includes a schematic process flow sheet, description of each process step and their alternatives, photo of a large NGL processing plant, and numerous references:

http://en.wikipedia.org/wiki/Natural_gas_processing

Milton Beychok
(Visit me at www.air-dispersion.com)
.