Booster for Positive Displacement Pump?

[eugen25]

Gentlemen, first of all I would like to salute everybody and to express my appreciations regarding this Forum. I’m a poor beginner, so, please, be patient with me. Currently, I’m involved in a concept regarding the transfer of oil from a tank to a storage area far away from our tank. I suggested a twin screw pump (positive displacement) which can provide the required characteristics (68 m3 @ 100 bar), obviously, with a VSD. The process guys jumped on me, saying that booster pumps are a must in such applications. Is it correct? And if it is correct, what type of pump should I choose for booster, because I don’t think a centrifugal one is recommended. And if it is recommended, what should be the characteristics for the booster pump(s)? The shaft power required by the twin screw pump is 400kW. Can anybody advise about the motor characteristics V / kW as the electrical guy is arguing with me.
Thank you very much in advance, and I hope to hear from you soon.
Eugen25

 

[MikeHalloran]

So it might be cheaper, life-cycle wise, to supercharge the screw pump's inlet with a centrifugal pump, even if it doesn't really need it, just to avoid the recurring cost of trying to explain npshR to every damn self- proclaimed expert who falls off the turnip truck for the next thirty years.



Mike Halloran
Pembroke Pines, FL, USA

 

[BigInch]

That's why I asked him if it was heavy crude or maybe a bitumen. Screws do work well when the viscosity starts affecting a centrifugal a little too much.

**********************
"The problem isn't working out the equation,
its finding the answer to the real question." BigInch

http://virtualpipeline.spaces.live.com/

 

[FACS]

BigInch,
Thanks for the concern, but I'll address the OP in the way I see fit, and as I understand what he might want to know. If I offer him something that he finds valuable, that's for him to decide, not you.



Charlie

http://www.facsco.com

 

[BigInch]

Busted!

Charlie, you're right. I didn't mean it in that context though. I was frustrated by the lack of progress in the question's definition at the time, and didn't follow your contribution much either. Looking back, I should have just asked you to explain what you meant. And even that, it looks like there's no need for now. Sorry.

**********************
"The problem isn't working out the equation,
its finding the answer to the real question." BigInch

http://virtualpipeline.spaces.live.com/

 

[FACS]

BigInch,
Don't worry about it, and I probably should have put in an emoticon to show that I wasn't trying to be testy. You are probably the most respected (by me at least) pipe line guy here......with some valuable experience.

I actually saw the post as a guy not really understanding why people were telling him he needed a booster pump. I was hoping he could read a few things and have the penny drop. Sometimes all we need to do is blurt out what we know, and someone figures out what they want. The more we put out there, the more people learn.



Charlie

http://www.facsco.com

 

[BigInch]

FACS, Thanks for understanding and the compliment.
Ya, I got caught up in a black hole while spiraling into that [∞] booster loop. There's really a lot of nonstandard terminology out there and I thought your booster function was starting to sound like a jockey pump.

We're OK here.

**********************
"The problem isn't working out the equation,
its finding the answer to the real question." BigInch

http://virtualpipeline.spaces.live.com/