When your pumping application involves the target slurry or liquid in a tank, hopper, etc that is positioned above your pump, this usually signifies a flooded suction application. What this means is that the liquid or slurry is positioned in a way where it can gravity feed into the suction of the pump. This then automatically primes the pump and allows it to move the slurry or liquid. Some common applications for this setup are process pump applications that are often found inside of plants and facilities.
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These setups usually involve an electrically driven pump with a variable frequency drive (VFD) or a soft-start. A VFD makes sure that the pump startup is monitored correctly and can also monitor the speed or rpm of the pump in order to control the flow and pressure of the pump. A less common power source for a flooded suction pump is a direct drive diesel driven pump. This can be found in outside hopper pump applications for sand and gravel pumping, mining, drilling mud pumping, etc.
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It is important to make sure that the material is not so thick or viscous that even though it is above the pump it fails to gravity feed into the pump. In a case like this, it is important to incorporate a vacuum pump in order to create enough of a vacuum to help feed the liquid or slurry into the pump. Please refer to the self-priming application below for more detailed information.
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