How do you choose pump pump curve?

The best and easiest way: contact a pump dealer and give him/her the pressure you need (feet head or PSI), and the volume (GPM) you want to pump, they can figure out which pump you need. This is the best way to select a pump, as the dealers know their pump lines much better than you.

What happens when a pump runs off its curve?

If a pump is running out on the end of the curve it can cause cavitation inside the pump and result in premature wear of the impeller and bearings of the motor. It can also cause the motor to over amp and prematurely fail.

What is pump system curve?

A system curve, as shown in Figure 2, is a graphical representation of the pump head that is required to move fluid through a piping system at various flow rates. The system curve helps quantify the resistance in a system due to friction and elevation change over the range of flows.

How does a VFD affect a pump curve?

A VFD can help here by raising the pump’s operating speed to a higher-than-standard rpm so the pump curve and system curve intersect at the desired flow rate — but at the expense of higher power requirements. Evaluating pump performance requires a BEP versus speed curve for the maximum diameter impeller.

How do you calculate pump speed?

Gas Load = Pumping Speed x Pressure. S = 100 liters/sec. Pumping Speed. This calculation shows that 100 liters/sec.

Is flow rate proportional to RPM?

Flow is proportional to velocity or pump speed, typically expressed in revolutions per minute (RPM) Head is proportional to the square of the velocity or pump speed. Power is proportional to the cube of the velocity or pump speed.

How do you calculate gpm from pump RPM?

  1. HYDRAULIC PUMP EQUATIONS. Horsepower Required to Drive Hydraulic Pump:
  2. HP = (PSI x GPM) ÷ (1714 x EFFICIENCY)
  3. GPM (theoretical) = RPM x CIR ÷ 231.
  4. T = HP x 63025 ÷ RPM.
  5. RPM = HP x 63025 ÷ T.
  6. Theoretical Pressure = T x 6.28 ÷ CIR.
  7. Volumetric Efficiency = Actual GPM x 100.
  8. Mechanical Efficiency = Actual PSI x 100.