What are characteristic curves of pump?

What are characteristic curves of pump?

The characteristic curve of a pump is the interaction of two variables that describe its performance: HEAD: the energy by unit of mass that the pump can supply to the fluid. FLOW RATE: the quantity of fluid that goes through a section in a certain period of time.

How do you select a curve from a pump?

Look at the left side of the curve and you will see a label HEAD – FT and numbers starting with 0 and increasing as you move up the chart. This is the pressure that the pump is capable of producing, measured in feet of head (not PSI!) The bottom of the curve is labeled US GPM. This is the flow that the pump produces.

What is characteristic curve of centrifugal pump?

The characteristic curves of centrifugal pumps plot the course of the following parameters against flow rate (Q): head (H) (see H/Q curve), power input (P), pump efficiency (η) and NPSHr, i.e. the NPSH required by the pump.

What are the characteristic curves?

A characteristic curve is a graph of the relationship between the amount of exposure given a film and it’s corresponding density after processing. The shape of the curve represents the tonal response of the film to a wide range of exposures and to one particular processing condition.

Why is the characteristic curve important?

I-V characteristic curves are generally used as a tool to determine and understand the basic parameters of a component or device and which can also be used to mathematically model its behaviour within an electronic circuit.

How do you calculate pump LPM?

Flow = (Displacement x RPM)/1000 Flow is in Liter per minute (LPM), Displacement is cc per revolution while RPM is rotation per minute. Q = (90 x 2222)/1000 = 200 l/min (approx).

How 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.

How pump characteristics curve is important for selection of any suitable pump?

It is also important to check that the flow rate and head of the pump are within the required specifications, which are normally presented as the Pump Characteristic curves. These plots play an important role in understanding the region in which the pump needs to be operated thus ensuring the life of the pump.

What is the characteristic curve?

A characteristic curve is a graph of the relationship between the amount of exposure given a film and it’s corresponding density after processing. 1. A typical film characteristic curve is made by plotting density produced, against the log of exposure given (Log E).

How do you find the characteristic curve?

For a PDE a(x,y,z)zx+b(x,y,z)zy=c(x,y,z), you can obtain the characteristic by solving the ODE’s dxds=a(x,y,z), dyds=b(x,y,z) dzds=c(x,y,z).

Can gear pumps be reversed?

Vane pumps can be reversed by dis-assembly and changing the orientation of the cartridge. As Bill Cook pointed out, a piston pump does not change pumping directon by reversing rotation and gear pump seals will not handle reverse pumping.

What is pump characteristic curve?

Characteristic curve. The characteristic curves of centrifugal pumps plot the course of the following parameters against flow rate (Q): head (H) (see H/Q curve), power input (P), pump efficiency (η) and NPSHr , i.e. the NPSH required by the pump.

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.

How do gear pumps operate?

A gear pump works on the principle of displacement. As the gears rotate inside the gear pump chamber, they create areas of low and high pressure. An area of low pressure, or vacuum, is created between the teeth of the gears when they un-mesh. Liquid flows into this area of lower pressure.