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Almost all irrigation pumps fall into this category.A centrifugal pump uses an impeller to spin the water rapidly in a casing, chamber, or housing. This spinning action moves the water through the pump by means of centrifugal force.
Centrifugal pumps may be multi-stage, which means they have more than one impeller and casing, and the water is passed from one impeller to another with an increase in pressure occurring each time. Each impeller/casing combination is referred to as a stage.
All centrifugal pumps must have a wet inlet, that is, there must be water in both the intake (inlet) pipe and the casing when the pump is started. They can't suck water up into the intake pipe. They must be primed by adding water to the intake pipe and case before the first use. To prime them, simply fill the intake pipe with water and then quickly turn on the pump.
To put it simply, this type of pump can't suck air, only water, so if there is no water already in the pump it won't pull any water up into it. Once it gets water in it the first time, most centrifugal pumps are designed to hold the water with a small valve so the pump doesn't need to be primed again every time you turn it on.
End-Suction Centrifugal Pump is the most common type. Typically the pump is close-coupledto an electric motor, that is, the pump is mounted right on the end of the motor's drive shaft and the pump case is bolted straight into the motor so that it looks like a single unit. The water typically enters the pump through a suction inletcentred on one side of the pump, and exits at the top. Almost all portable pumps are end-suction centrifugal type pumps. End-suction centrifugal pumps generally need to be primed the first time they are used after that most will not require priming unless a leak develops in the intake pipe.
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