What is the formula for pump?
Pumping Formulae for water at 20°C
| Volumetric flow from mass flow | ||
|---|---|---|
| Head (ft) | = | 0.3354 * Pressure (kPa) |
| Pump input power from pump performance | ||
| Power (kW) | = | volumetric flow (L/s) * Head (m) 102.2 * Efficiency (decimal) |
| Motor input energy per volume of liquid pumped |
How do you define pump curve?
A pump curve denotes flow on the x-axis (horizontal) and head pressure on the y-axis (vertical). The curve begins at the point of zero flow, or shutoff head, and gradually descends until it reaches the pump runout point or maximum flow rate.
What is head loss equation?
The head loss due to the friction Hf in a given conduit for a given discharge is usually determined by the Darcy-Weisbach equation: H f = f LV 2 D 2 g. The dimensionless friction factor f is a function of velocity, roughness, viscosity of the fluid, and conduit diameter.
How do you calculate pump size?
Use the pump flowrate calculation: Divide the container volume by the length of time it took to fill up to get the flow rate. 5 gallons / 1 minute = 5 gallons per minute. 5 gallons /30 seconds (0.5 minutes) = 10 gallons per minute.
How is pump performance calculated?
This is the efficiency of the pump in turning input shaft power (from the motor) into useful power output to the fluid (Hydraulic Power), it is calculated using the following formula: Pump Hydraulic Efficiency (%) = Pump Hydraulic Power Output (kW) x 100 / Pump Input Shaft Power (kW).
How do you calculate pump head loss?
How to calculate head loss:
- Head Loss (Pc) = [Equiv. pipe length + Installation pipe length] x Pc % / 100 x Corrector.
- Equivalent pipe length. This refers to the equivalent length of the non-straight pipework when compared to straight pipes (in metres).
- Installation pipe length.
- Pc % and Corrector.
How do you calculate pump head?
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. Hw is the head loss, including the Darcy formula or Xie Cai formula for calculating the head loss hf and the local head loss hw hf along the path.
How to read a pump curve?
Head & Flow. The first piece of information provided by a pump curve is the flow that the pump will develop at any given…
What is a pump performance curve?
The pump performance curve describes the relation between the flowrate and the head for the actual pump. Other important information for a proper pump selection is also included – like efficiency curves, NPSHr curve, pump curves for several impeller diameters and different speeds, and power consumption.
What is a 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.
What is a centrifugal pump curve?
A centrifugal pump is a very simple device, mechanically. Reading the centrifugal pump curve, however, is a different story. It consists of an impeller that is attached to a shaft which is rotated by a driver, most often by an electric motor.