Theoretical discharge of a PD Pump
Theoretical discharge of a PD Pump
(OP)
Hi,
How can I calculte the theoretical discharge of tri-lobe pump accurately.
How can I calculte the theoretical discharge of tri-lobe pump accurately.
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Theoretical discharge of a PD Pump
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Theoretical discharge of a PD PumpTheoretical discharge of a PD Pump(OP)
Hi,
How can I calculte the theoretical discharge of tri-lobe pump accurately. Red Flag SubmittedThank you for helping keep Eng-Tips Forums free from inappropriate posts. Reply To This ThreadPosting in the Eng-Tips forums is a member-only feature.Click Here to join Eng-Tips and talk with other members! |
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RE: Theoretical discharge of a PD Pump
Tim
RE: Theoretical discharge of a PD Pump
Forgive me if this is totally obvious or totally incorrect.
RE: Theoretical discharge of a PD Pump
Take motor's output (and that's an open question if you want to use the nameplate, with any additional design allowances or a short-term start-up value), the flow rate and the pump's (and gearing if applicable) efficiency. That will allow to you calculate the maximum discharge pressure.
Essentially the formula is the same as for sizing the pump in the first place:
BHp = Q * dP / (eff * 1714)
RE: Theoretical discharge of a PD Pump
For modeling purposes, assume a pump that truly moves a fixed flow rate. A recirculation line from discharge to suction with a flow restricing orifice in it is added. The flow orifice size is "tweaked" to produce the same amount of slip as at a given differential pressure and viscosity as the pump manufacturer's literature suggests. The pump-orifice combination fairly accurately models the performance of an actual lobe pump. By the way, the same applies to a roots blower moving gases.
RE: Theoretical discharge of a PD Pump