Calculation of Centrifugal Pumps

Centrifugal pumps are the most used equipment for pumping and transferring liquids in basic sanitation, in crop irrigation, in residential buildings and industries in general.

Here you will find information for selection and sizing of centrifugal pumps, its applications and constructive characteristics, as well as tabulated flow and head hydraulic data.

Tip: Download and use our spreadsheets for calculating and sizing centrifugal pumps: Calculation Spreadsheets


1. Definition: Are Operating Hydraulic Machines, this is, machines that receive potential energy (driving force of an engine or turbine), and transform part of this power into kinetic energy (movement) and pressure energy (force), yielding these two energies to the pumped fluid, in order to recirculate or transport it from one point to another.

Therefore, the use of hydraulic pumps occurs whenever there is a need to increase the working pressure of a liquid substance contained in a system, the flow velocity, or both.

The entry of liquid into the pump is called the suction., where the pressure can be less than atmospheric (vacuum) or superior. The pump liquid outlet location is known as the discharge. The pressure difference in suction and pump discharge is known as full head (Hman)and which determines the ability of the pump to transfer liquid, depending on the pressures that must overcome, expressed in pressure energy.

2. Classification: Due to the great diversity of existing pumps, we will adopt a summary classification, dividing them into two large groups:

A. Centrifugal Pumps or Turbo-Pumps, also known as Hydro or Rotodynamic;

B. Volumetric Pumps, also known as Positive Displacement.

The first step in choosing a pump is to estimate the flow it should provide. This information must be obtained from technical indices existing in the literature (See the material available for Download). Manufacturers generally report the flow rate a pump is capable of delivering in the m3/h unit.

See the complete material here, and size the correct pump for your application:

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Calculation of Centrifugal Pumps
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