2 replies to this topic

[swak]

Hi Friends,


How much efficiency will be considered for Twin screw pump during design stage?
Fluid to be pumped is crude oil.
For centrifugal pumps, we used to consider 65-70% efficiency.

And Power calculation for screw pump will remain same as centrifugal pump or differs? Advise.

[mdteng]

Swak.
Twin screw pumps performance vary so much with the viscocity of the crude to be pumped and the velocity of the pump.
We have installe a Bonemann pump in 2006 as a pipeline booster pump in south Argentina to pump a crude with 80cSt viscocity, 1654 rpm and discharge presure of 79 bar@140m³/h, performance was 66.8%
Chapter 3 of Karasik pumping manual gives typical overall efficiency curves for estimating performance.

[Ariel]

Hello,

Like mdteng said it is very variable. Once I talked to a Bornemann Sales Engineer and we agreed to take 60% pump efficiency, then 20% more power for motor specifications. That’s are the rule of thumb that I follow when y use this kind of pump’s.
Bye!!!!!