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How to choose a right pump for your project?

  • 2019/10/16

A pump is a mechanical device that transports media by transforming the energy supplied by a motor into hydraulic energy. While pumps are found everywhere from swimming pools to chemical vats to fuel depots, each application can have its unique challenges. But not all pumps are created equal. Therefore, when selecting a pump, the first criterion is the type of media. What’s more, it is necessary to know the parameters such as flow rate, suction head, discharge head, head losses, etc, to properly dimension the machine and calculated the operating point of the pump.

To choose the suitable pump to meet your needs, you must know the media type first, in order to avoid corrosion phenomena and therefore premature wear of your pump. It is therefore essential to know the chemical composition of the media to be pumped, its viscosity, and the possible presence of solid components. Thorough knowledge of all the physical properties of the treated fluid will allow you to choose the ideal technology for your application and the construction materials compatible with the pumped media. There are chemical compatibility tables to consult before choosing the casing of your pump. Then, you should check the characteristics related to transporting the media, in particular:

*The flow you require: generally measured in m3/h (cubic meters per hour) or GPM (gallons per minute), the flow necessarily influences the size and dimensions of your pump;

*The suction head (height between the inlet of the suction pipe and the pump): as a general rule, the suction head must not exceed 10 meters. Beyond this, it is necessary to consider using a submersible pump.

*The discharge head (height between the pump and the discharge pipe outlet).

*The length of the discharge circuit.

*Head losses are linked to obstacles on the pumping circuit (valves, bends, etc.).

*Whether there is a discharge tank or not could change the head.

*The temperature thus depends on the choice of the pump casing

Different Kind of Media:

As a general rule, the more viscous the media, the more difficult the flow through your pumping system, but be careful, the viscosity of media varies according to operating conditions. There are 4 main groups of fluids according to their viscosity level; in the first group, there are fluids such as water, oil, or alcohol that move in the same way regardless of speed or level of agitation. For these types of uses, you will not have many constraints in choosing your pump. In the second group, there are certain food products, such as butter or cream whose viscosity increases with agitation; therefore, in these cases, a standard centrifugal pump will not be suitable for the fluid flow. The third group includes media that has a threshold to be exceeded before flowing. Once this point is reached, the viscosity decreases with agitation. Adhesives, paints, and greases are part of the fourth group that is very thick at rest, but their viscosity decreases if constant agitation is maintained.

Different types of the Pump:

There are different types of pumps, namely:

Centrifugal pumps (the fluid is sucked in by a paddle wheel or propeller); are the most common model.

Diaphragm pumps (the fluid is sucked in by the oscillation of a diaphragm).

Piston pumps (the fluid is sucked in and out by the reciprocating movement of one or more pistons).

Peristaltic pumps (the fluid is pushed into a pipe compressed by rotating rollers).

Gear pumps (the fluid is sucked in and discharged by the rotation of a rotor and pinion or by two pinions rotating in opposite directions).

There are also pumps dedicated to specific uses, which incorporate the various operating principles described above, for example:

*Metering pumps, or dosing pumps, are used to inject fluid precisely and accurately.

*Lift pumps are used for example for evacuating wastewater.

*Drum pumps are used to transfer a fluid contained in a drum or a canister.

*Lubrication pumps as their name indicates are used to manage the lubrication of a system.

*Submersible pumps directly suck the fluid into the pump so it is not limited by the suction height.

M-dirver Technology provides various variable frequency drives for the pumps, which are suitable for all kinds of pumps. Driving by the VFD, you will get better performance of the pump, and makes the pump life longer, and avoiding the water hammer effect, etc.