Using variable speed drives (VSDs) in pump applications
Using variable speed drives (VSDs) in pump applications

Applications

The purpose of this Application guide is to give design and project engineers and any other interested parties the basic information for selecting the correct variable speed drive (VSD) system for pump installations in industrial, public and domestic applications.

Pumps are one of the most common variable speed drive (VSD) system applications and special interest has focused on improving their energy efficiency by using variable speed control instead of throttling or other less efficient flow control methods.

Pumps are the single largest user of electricity in industry in the European Union, consuming 160 TWh per annum of electricity and accounting for 79 million tonnes of carbon dioxide (CO2) emissions.

The content of this guide has been kept as practical as possible, without going into too much theoretical depth. The symbols and definitions used are explained at the end of this document.


The basic function of pumps

The purpose of pumps is to transfer liquids from a source to a destination. A common example is fi lling a high level reservoir or increasing liquid pressure. Other examples are fi lling a pressurized tank or circulating liquid around a system as a means of heat transfer.

There are two main categories of pumps:

  • Centrifugal (rotodynamic) pumps
  • Positive displacement pumps

This Application guide focuses on centrifugal pumps. These account for 80% of all industrial pumps.


Centrifugal pumps

The centrifugal pump is a mechanical device for increasing the pressure of liquid.

In passing through the pump, the liquid is accelerated in the impeller, discharging into the casing at high velocity. This energy used is converted into pressure of the liquid as effectively as possible.

Title:Using variable speed drives (VSDs) in pump applications – ABB
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Using variable speed drives (VSDs) in pump applications
Using variable speed drives (VSDs) in pump applications

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7 Comments

  1. […] chosen in relation to the inertia of the mechanical load and the type of application. For example, in a pumping application, the acceleration time should be slow enough to prevent water hammer in the […]

  2. […] in these cases is to choose one whose speed-torque curve exceeds the load torque curve.Loads from centrifugal pumps, fans, blowers, compressors with unloaders, and similar equipment tend to be variable over time. In […]

  3. […] better selection of motor, it is necessary to specify the type of driven equipment, viz., centrifugal pump, compressor, blower, bowl mill, conveyor drive, etc.The moment of inertia and accelerating torque […]


  4. RENATO
    Jul 28, 2012

    is it any different with Hydrovar?

  5. […] have been used, although each has its inherent advantages and disadvantages.There are few types of Variable Speed Control:Control Valves, Dampers and VanesFossil Fuel EnginesEddy Current ClutchesHydraulic […]

  6. […] of other appliances and devices all use electric motors to convert electrical energy into useful mechanical energy. In addition to running the commonplace appliances that we use every day, electric motors are also […]

  7. […] of applications, the ones that will produce the most significant benefits are those that require variable speed operation. For example, the flow rate produced by pumps serving building HVAC systems can be matched to the […]

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