Self Priming Pump is a pump which has been specifically designed to allow the pump to re-prime itself when under lift conditions.
These types of pumps are extremely efficient because they eliminate the need for ejector and vacuum pumps and also foot valves, which may become clogged and in turn may become impractical to use for remote or prolonged operation.
Technically, self-priming pumps are similar to a centrifugal pump. It uses a combination of air along with water to meet a fully primed pumping status. Below are the brief description and their qualities that make them more suitable for industries worldwide than the standard one.
In the case of regular centrifugal pumps, to create a pressure difference and ease smooth pumping, centrifugal forces are generated. These pumps work only when they are entirely surrounded by water. And, if even the slightest amount of air is present in the chamber then the pump will be air-bound and it will fail to work until the air is removed.
Self-priming pumps overcome this shortcoming of centrifugal pumps. They are specifically designed to efficiently pump a mixture of air and water. This is accomplished by mixing air and water. The resulting mixture is pumped in the same way as the water from a regular pump. Once it forms the mixture of air and water, it starts pumping the mixture until it completely removes every trace of air present in the chamber. It will then ultimately pump only water when the air is completely removed.
It is necessary to note that while self-priming pumps have the capacity to deal with the air present inside the pump casing; it will never work if there is no water. Ensure that there is some water inside the casing before one starts the pump.
A unique water tank is incorporated into the layout of self-priming pumps that is absent in regular centrifugal pumps. This salient feature allows self-priming pumps to recirculate water and carry out the priming cycle.