What are the main factors to keep in mind when buying a water pump?

Water pumps come in many shapes and sizes, and each one offers different features that work for specific applications. When it’s time to select a pump that can meet your needs and expectations, there are plenty of factors to keep in mind; Continue reading to learn more about these factors.

How do you calculate pump flow?

The pump’s flow or flow rate is the volume of water (or fluid) that the pump can deliver in a specific amount of time. If the goal is to fill a tank, you can calculate this value by dividing the size of the tank or container that must be filled, by the time it takes to fill it.
In the case of irrigation systems or domestic pressure systems, you must know the flow rate of each faucet, sprinkler, or pressure washer in the system. This information should be available in the technical brochure of the aforementioned devices. The total flow rate will be the sum of all the flow rates in the irrigation system.

How do you calculate pump pressure?

To calculate the pump’s pressure, you must know the suction height (Hs) and the discharge height (Hd). The suction height is the vertical distance between the pump’s inlet and the water level of the reservoir. On the other hand, the discharge height is the vertical distance between the pump’s outlet and the place where the liquid needs to be delivered. Both values are expressed in meters or feet.

Another element to keep in mind to calculate the pump’s pressure is the operating pressure (pw), which is the required force for a liquid to operate a device such as a sprinkler or a faucet. This information should be displayed on the device’s technical brochure.
The pump’s pressure will be the sum of these three values (Hs, Hd, and pw). A safety margin of 10 -20% should be added to the result.

What is the water source?

This is the body of water or reservoir from which the pump will take liquid. It can be a river, a tank, a well a cistern, or a pipe.

What is the type of fluid?

We already know that pumps move water (clean and dirty), however, they can also work with other types of fluid such as milk, juice, fuel, etc. The type of fluid will be a determining factor when it comes to choosing a pump.

What is the available power source?

This is one of the most important factors to keep in mind when picking a water pump. It is the type of electrical energy available in the place where the pump will be installed. This measurement is expressed in volts (V). It is essential to know whether the available voltage in the place of installation is single-phase (110 V/220 V) or three-phase (220V /380V/ 440V/480V). The voltage of the pump’s motor must coincide with the voltage in the place of installation.

These are all the factors you’ll need to know when buying a pump. Next, we’ll show you some details that are not determining factors, but are still worth knowing:

What is the power requirement?

This is the force that the motor is able to give so that the pump can reach its objective. It is expressed in horsepower (HP) or kilowatts (Kw). It is wrong to choose a pump using power as the sole factor because two pumps with the same power can have different pressures and flow rates.

What is the amperage?

This is the flow of electric current that can feed the pump’s motor and it is expressed in amperes. This will determine the amount of energy that the pump will consume. It is important to know the pump’s amperage and to make sure that the place of installation will be able to handle this amperage.

What are the inlet and outlet diameters of the pump?

It is measured in millimeters or, most commonly, in inches. It should not be mistaken for the diameter of the pipe. The former is an intrinsic part of the pump’s design, while the latter will vary depending on installation conditions. The diameter of the pipe must adapt to the inlet and outlet diameters of the pump; it also has to adapt to the pump’s flow rate.

By answering these questions, you should have all the necessary information to make the right decision and get the pump that best suits your needs. If you want to learn more about Pearl Water Pumps, feel free to browse through our wide range of products, including submersible pumps, centrifugal pumps, pressure systems, and much more.

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