To read the curve, find a point on the bottom horizontal axis , which represents GPM (Gallons per Minute). Draw an imaginary line from the 1GPM dash straight up to where the 1GPM line hits the pump curve.
How do you read a pump specification?
A PD pump curve indicates pump capacity, on the horizontal lines, in units per minute. In this example, the curve indicates gallons per minute (GPM) and liters per minute (LPM) in the left margin and the vertical lines indicates pump speed in revolutions per minute (RPM).
How is pump performance measured?
The performance of a pump can be measured using 3 main analytical models; flow rate (Q), head (h), and efficiency (n) . These 3 models allow users to gain an overall sense of how the pump is performing during operation.
How do you read pump efficiency curves?
To read the curve, find a point on the bottom horizontal axis , which represents GPM (Gallons per Minute). Draw an imaginary line from the 1GPM dash straight up to where the 1GPM line hits the pump curve.
What is performance curve of a pump?
A centrifugal pump performance curve is a tool that shows how a pump will perform in terms of head and flow . Pumps can generate high volume flow rates when pumping against low-pressure head or low volume flow rates when pumping against high-pressure head.
How do I calculate flow rate?
Q=Vt Q = V t , where V is the volume and t is the elapsed time. The SI unit for flow rate is m 3 /s, but a number of other units for Q are in common use. For example, the heart of a resting adult pumps blood at a rate of 5.00 liters per minute (L/min).
What is flow rate of a pump?
Volume flow rate (Q), also referred to as capacity, is the volume of liquid that travels through the pump in a given time (measured in gallons per minute or gpm). It defines the rate at which a pump can push fluid through the system.
What is pump head calculation?
The head is calculated as H=E2-E1 . The pump head H=z+hw z is the height difference of the pumping height, that is, the water level from the inlet to the water surface at the exit.
How do you read a pump nameplate?
- FR – FRAME TYPE. ...
- HP – HORSEPOWER. ...
- SF – Service Factor. ...
- VOLTS: 115/230 tells us that this motor is “reversible”. ...
- AMPS – Indicated by two numbers, i.e. 8.8/4.4, this tells you the amperage draw of the motor connected to 115V (8.8) and 230 Volts (4.4).
What is the efficiency of a centrifugal pump?
Centrifugal pumps can approach 94 percent efficiency , but typical efficiencies are 55 percent for small pumps and 70 percent for large pumps. The amount of electrical energy used by the pumps in an average industrial facility will vary by plant type.
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.
How do you create a pump performance curve?
The Formula for PSI: Feet of Head/2.31 = PSI
A basic pump performance curve for centrifugal pumps show it’s performance range. In this curve, head is measured in PSI; flow is measured in gallons per hour.
What is pump capacity?
Pump capacity is a term used to define the flow rate through a pump at its designed conditions. It describes the volume of liquid that is allowed to travel through the pump in a given time. ... Based on this definition, pump capacity is expressed as fluid volume per unit time .
What is normal flow rate?
Normal flow rate is 1 atmosphere (101.3 kPa) or 14.696 psia at 32 0 F (0 0 C). Actual flow rate is the actual volume of fluid that passes a given point based on given pressure and temperature of the process.
What is the drip rate formula?
Drip Rates — is when the infusion volume is calculated into drops. The formula for the Drip Rate: Drip Rate = Volume (mL) Time (h) . A patient is ordered to receive 1 000 mL of intravenous fluids to run over 8 hours.
How do you calculate flow rate per hour?
Q=Vt Q = V t , where V is the volume and t is the elapsed time. The SI unit for flow rate is m 3 /s, but a number of other units for Q are in common use. For example, the heart of a resting adult pumps blood at a rate of 5.00 liters per minute (L/min).
