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.
EBARA manufacturers its 3U/3UB end suction pump designed for corrosion resistance. The pump is made with stainless steel and a good fit applications involving moderately aggressive fluids used in water treatment, ultrapure water systems, plant services and more. The 3U/3UB pump has a flow capacity of 650 gpm and a total head range to 250 ft.
The company manufactures several end suction pumps to meet the needs of several water and industrial applications. Griswold’s E, F, and G series centrifugal pumps are some of the most popular water pumps used in various water parks, fountains, general industry, aquariums, and agricultural irrigation. The pump includes a back pull out design for easy maintenance and can handle up to 3,000 gpm at 310 ft of head. The end suction pumps also have flanged connections to meet ANSI B16.1 standards.
Water applications - The Patterson H2O Works™ end suction pumps are built to handle water and clear industrial fluids with flow capacity up to 2,500 gpm and total dynamic head up to 400 ft. The pump features a high-efficiency design to minimize energy consumption. Two end suction models are available—frame-mounted and close-coupled. Closed-coupled units can be either flanged or threaded.
Fire suppression applications – Patterson’s Sentinel end suction fire pumps are available in two configurations—frame-mounted or close-coupled, which can be flanged or threaded. The pump has pressure ratings from 40 to 150 psi (3 to 10 bar) and flow rates from 50 to 750 gpm (189 to 2,835 liters/min).
HVAC applications – Patterson’s EnviroFlo™ ES series end suction pumps are available with standard flows up to 2,500 gpm, and heads up to 400 ft TDH. The pumps are available in either close-coupled or frame-mounted versions.
Pumps are available in many different types and configurations. The key to finding the right pump for the job involves asking the right questions.
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