4 replies to this topic

[Takechi]

Dear all

 

My screw pump was design 

 

- Suction pressure = 1.93 kscg

- Diff. pressure  = 7.32 kscg

- PSV discharge setpoint = 10.7 kscg

- The tip of performance curve = 7.32 kscg

 

My question is what is the effect if I operate higher performance curve such as operate at discharge pressure = 10.5 kscg?

 

Best regard,

 

Salapao

[AlertO]

Dear Salapao

 

Ideally, the positive displacement pump i.e. screw pump can build the pressure to infinite value. However, the limitation will be at pump motor. more discharge pressure will require more power; therefore, if the required power to have discharge pressure of 10.5 kscg is lower than the rated power of the motor, the process should be fine.

 

In addition, the operated pressure is too close to the PSV set pressure which can lead to PSV leakage or partailly passing.

 

Hope this may answer your question.

[Takechi]

How about the efficiency of this pump when diff. pressure higher than performance curve?

 

Salapao

[Saml]

Salapao, what do you mean by "The tip of performance curve".

[Takechi]

Saml, I mean the end of performance curve.

 

Remark.

As I know for the centrifugal pump the problem will occur or performance will drop if we operate higher than the end of performance curve.