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End Suction Pumps

What is an end suction pump?

A type of centrifugal pump that has a casing with the suction coming in one end and the discharge coming out the top. They are almost always single stage pumps, that is, they have only one impeller.

End suction pumps are the most common configuration for centrifugal pumps, and the least expensive configuration in many cases. A huge variation of sizes, materials of construction, and designs are offered by manufacturers to handle everything from water at ambient temperature to high pressure and high temperature viscous oils, abrasive slurries, and corrosive chemicals.

How end suction pumps work?

The pump usually contain one impeller and a volute type casing. The pumped liquid moves along the vanes of the impeller, which raises the velocity of the liquid. From there the liquid moves into the volute casing, where the high velocity is converted to high pressure through a diffusion process. 

They are normally driven by an A.C. electric motor, though there are D.C. motor driven ones available, as well as ones driven by air motors, hydraulic motors, steam turbines, and diesel and gasoline engines.

End suction pumps may be close-coupled, with the pump impeller attached directly to the driver shaft and with no separate coupling between them; or they may be frame mounted, with the pump having its own set of bearings and with a coupling separating the pump and motor.

What types are available?

End suction pumps are useful in many types of residential, commercial, and industrial applications. Since they are so common and available from so many pump suppliers, they are often offered at very attractive prices. 

Standard water pumps are often close coupled, and made of standard iron or various plastics for low cost. For more heavy duty industrial applications, the pumps are usually mounted on a bedplate with a coupling separating the pump and motor. These are often supplied in stainless steel or more exotic alloys or plastics for corrosion resistance, or made of hardened iron for slurry applications in mining, dredging, and minerals processing.

End suction pumps may be fitted with open impellers, for chemical or food processing applications that may contain solids, or they may have closed impellers for relatively clean water and oil services. They may be designed to specific pump standards such as the ANSI B73.1 standard for chemical pump services, or the API 610 hydrocarbon processing standard. The pump shaft may be sealed from the environment with conventional packing, mechanical seals, or the pump may be a magnetic drive or canned motor pump type.

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