Plunger Pump and Multistage Centrifugal Pump opperating in Parallel
Plunger Pump and Multistage Centrifugal Pump opperating in Parallel
(OP)
I just learned of a pump opperator that wants to run a multistage centrifugal pump in parallel with a possitive displacement plunger pump.
Has anyone seen or heard of this being done before? If so what would be the justification from an operational standpoint for doing this. What measures have to be taken in sizing the pumps and design the system's discharge piping, etc. to make this work?
Has anyone seen or heard of this being done before? If so what would be the justification from an operational standpoint for doing this. What measures have to be taken in sizing the pumps and design the system's discharge piping, etc. to make this work?





RE: Plunger Pump and Multistage Centrifugal Pump opperating in Parallel
Put a check on the CP discharge and run the PD's speed on flow control. You might need a recycle line off the CP's discharge (takeoff before its check valve), in case the PD started forcing the CP's flow below minimum. A power limit, or a pressure relief on the PD itself, or downstream to be sure it can't overpressure the discharge.
Only put off until tomorrow what you are willing to die having left undone. - Pablo Picasso
RE: Plunger Pump and Multistage Centrifugal Pump opperating in Parallel
RE: Plunger Pump and Multistage Centrifugal Pump opperating in Parallel
I won't do it except in applications like micalbrch mentioned where they are sequential and don't run in parallel very often or for very long.
I've seen a lot of people try to run centrifugal compressors in parallel with recips and I've never seen that work very well. Control of the two machines is difficult and the first time the surge override on the centrifugal backs it off the recip takes over and the dynamic machine coasts from that point forward.
David
RE: Plunger Pump and Multistage Centrifugal Pump opperating in Parallel
This is a general guideline, but where the static elevation is the primary system component, they may operate successfully.
The pumps must be started in proper sequence and the system conditions must allow both pumps to operate at or near BEP.
RE: Plunger Pump and Multistage Centrifugal Pump opperating in Parallel
Only put off until tomorrow what you are willing to die having left undone. - Pablo Picasso
RE: Plunger Pump and Multistage Centrifugal Pump opperating in Parallel
David
RE: Plunger Pump and Multistage Centrifugal Pump opperating in Parallel
Only put off until tomorrow what you are willing to die having left undone. - Pablo Picasso
RE: Plunger Pump and Multistage Centrifugal Pump opperating in Parallel