A self-priming pump is a special type of fluid pump that requires the pump chamber or pump body to be filled with liquid in order to begin the pumping process. This design feature provides an opportunity to improve the operational efficiency of processing plants, where pumps are used for a range of repetitive but intermittent operations.

The constant presence of fluid in the pump body allows the pump to better handle the buildup of air bubbles in the so-called "air pockets" or pump operating mechanism that can interfere with its proper operation. In practice, a self-priming pump pre-fills the associated fluid through a small port located on the pump body (the chamber where the impeller is located). After this operation, the pump can run, triggering turbulence that causes the fluid to rise and "clear" the air in the pipe.

DEBEM's self-priming pump

One of the most common design methods for inducing the start process involves the following steps:

Create a reservoir parallel to the utility line with a volume equal to or greater than the amount of fluid needed to fill the suction line. The tank allows the pump to release air from the pump body and suction line during the start-up cycle, replacing the air with liquid from the tank mixed with the remaining air.

• Insert a check valve in front of the pump so you don't have to repeat the filling operation every time you need to run the pump.

The "self-priming" ability of this type of centrifugal pump comes from the tank's ability to hold the liquid after initial absorption. When describing the concept of self-priming, centrifugal pump types are always mentioned. However, there are several types of pumps that can be associated with the term, especially positive displacement diaphragm pumps, peristaltic pumps, and CAM pumps.

Debem offers a range of fully pneumatic double diaphragm positive displacement pumps with full self-priming. In certain cases, the operation of Cubic and Boxer series pumps makes parallel tanks in the pump body unnecessary. This can be considered a huge advantage in applications where limited space conditions require the use of pumps that are smaller than the standard size of the reservoir model.

The main application of self-priming pump

Self-priming pumps are used in many applications. Specifically, in the food and pharmaceutical industries, pumps are placed in production lines to perform various operations, such as:

• Moving liquids, ingredients, raw materials and semi-finished products through production lines.

• Pump CIP (Clean in place) fluids to perform cleaning and disinfection operations on pipes and plant components.

• Transfer liquid from one storage container to another.

• Perform bucket and can emptying operations.

Self-priming pumps are also easy to use in the construction, agriculture and water treatment sectors, as it needs to be able to extract and pump water correctly while maintaining high efficiency conditions in the plant.

Advantages of using self-priming pumps

The main advantages of DEBEM self-priming pump are many, which can be summarized as follows:

• Pumps with self-priming function ensure a higher suction height compared to classical centrifugal pumps that are capable of sucking in liquids from a maximum height of 5-6 meters.

This type of pump can handle a wide variety of liquids and is an ideal solution for handling special fluids, such as grout, corrosive liquids and liquids with suspended solids.

• The technology is ideal for performing frequent and intermittent pumping operations because it eliminates the pump starting step at startup.

• DEBEM pumps do not include a reservoir inside the pump and can therefore have a smaller size than standard pumps.

• Self-priming pumps have maintenance characteristics that are easier to operate than submersible pumps because they do not need to operate in confined Spaces or liquids.

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