What is performance curve of a pump?
A pump performance curve indicates how a pump will perform in regards to pressure head and flow. A curve is defined for a specific operating speed (rpm) and a specific inlet/outlet diameter. The curve also shows the shut off head or the head that the pump would generate if operating against a closed valve.
What does pump curve mean?
Pump curves are essentially data about a given pump’s ability to produce flow against certain head. When you’re reading a curve, the pump’s flow rate will be on the top and bottom and its height to push is on the sides.
What is the flow rate of a centrifugal pump?
The unit of the flow rate is m3/s; in centrifugal pump engineering the units m3/h and l/sare more common. Various measuring methods are used for flow rate measurement (see Flow velocity measurement). Various types of flow rate are distinguished in conjunction with the H/Q curve (see Characteristic curve).
How do you calculate the flow rate of a centrifugal pump?
Determine the pump flow rate, head, and power requirements if the pump speed is increased to 3600 rpm. It is possible to develop the characteristic curve for the new speed of a pump based on the curve for its original speed….Pump Laws.
|n||=||speed of pump impeller (rpm)|
|P||=||pump power (kW)|
How are pump curves generated?
Pump curves can be generated by reading measurements of pressure, NPSH, power, efficiency and others, while the pump is operating at different flow conditions. These results are then plotted against the flow rate to generate the pump characteristic curves. It consists of various other components apart from the pumps.
What is NPSH pump curve?
The NPSH curve displays the minimum required inlet pressure (expressed in m) allowing the pump to pump in accordance with the performance curve and in order to prevent evaporation of the pumped fluid so as to avoid cavitation inside the pump.
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 is pump head calculation?
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.
What is the difference between pump curve and system curve?
In general, a pump is used to overcome frictional head loss in piping systems as well as system elevation changes between system boundaries (i.e., static head). The system curve helps quantify the resistance in a system due to friction and elevation change over the range of flows.
How should we use a centrifugal pump?
Centrifugal Pumps has been designed specially for use in the food, dairy, beverage, pharmaceutical and light chemical industries. Centrifugal pumps including multi-stage designs and those for high inlet pressure, can handle most low viscosity applications.
How do you read a pump curve?
Find a point on the pump curve and find the corresponding numbers on the y-axis and the x-axis. You can do this by lining up the point with your index fingers or, if you need a more precise reading, use a ruler and a pencil to mark the exact location of the point along the y-axis and x-axis.
What are the characteristics of centrifugal pump?
Structural Characteristics of Centrifugal pumps Impeller. The impeller for the centrifugal pump is available in different shapes and sizes depending on the required performance and the characteristics of the liquids being pumped. Casing. Cover. Support.
What is the pump characteristic curve?
The pump characteristic is normally described graphically by the manufacturer as the pump performance curve. The pump performance curve describes the relation between the flowrate and the head for the actual pump.