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AODD Configurator

AODD Configurator

HOW TO CHOOSE A CENTRIFUGAL PUMP TO MEET YOUR REQUIREMENTS

19 September 2019

When constructing plants, the creation of production cycles, transfer operations of fluid and so on, it is essential to know how to choose the right pump type and size.

Different factors come into play here which must be carefully assessed.

 Why is it important to get the right pump size?

The right pump size is important for two reasons:

  • Firstly, to guarantee the correct supply of fluid required during the normal usage cycle.
  • Estimate costs that derive from purchase and usage, respectively known as project Costs and operating Costs

In practice, attempts are made to avoid oversizing in order to reduce operating costs to a minimum.

What are the parameters for identifying the most suitable pump?

Initially, leaving aside the discussion of costs, the choice should focus on the features of the plant which one hopes to obtain.

  • Quantity and head

In other words, what is the volumetric (m^3/h) or mass (kg/h) flow rate which needs to be achieved and which head needs to stand out.

When calculating the head, it is essential to bear in mind the different elements: losses due to a normal flow of the fluid along the piping (distributed losses); losses due to plant elements found along the line (concentrated losses), as can be the case with valves, pipe elbows, check valves and fittings; lastly, the uneven level to be overcome to move the fluid from point A to point B (geodetic head) should be taken into consideration.

To calculate the head, see https://www.debem.com/calculating-the-head/

  • Fluid characteristics

The fluid also plays a key role when choosing.

Its temperature, density, viscosity and nature of the fluid itself as well as the presence or lack of, of particles in it.

The temperature and nature of the fluid influence the choice of materials that make up the pump.

Density and viscosity, important parameters to be taken into consideration respectively for the choice of engine power and type and size of impeller (opening or closure and external diameter), without forgetting their contribution to the calculation of the losses along the piping.

The presence of particles to decide on the kind of pump, with mechanical seal (lip, bellow…) or a pump with magnetic drive.

Bearing this in mind, see https://www.debem.com/mechanical-pump-seals/

  • Positioning

Choosing a pump with vertical or horizontal axis subject to its position inside the plant.

The centrifugal pumps are highly efficient tools. However, their operating requirements do not make them universal. In many cases, volumetric pumps come willingly into play:

see https://www.debem.com/prod/air-operated-double-diaphragm-pumps/

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