Griswold 811 Series PumpGriswold Pump Company’s 811 Series ANSI Centrifugal Pumps are designed for use in saltwater handling and transfer applications in oil and gas recovery. The pumps have two times the wear area between the case and impeller when compared to closed-impeller designs. The open-impeller design also minimizes concentrated wear by balancing the hydraulic axial thrust load and reducing the stuffing-box pressure. The pumps have casings that can be constructed of ductile iron, 316 stainless steel, CD4MCu, and alloy 20. Other features are self-tightening impellers that reduce leaks and failures; the ability to externally adjust the clearance for peak efficiency even after wear-area loss; and optional enhanced power frames. The pumps are available in a full range of sizes, as well as options and upgrades that can be tailored to meet liquid-handling flowrates up to and including 4,000 GPM (908 m3/hr). An array of mechanical-seal options allows for operation in temperatures as high as 500 F (260 C). –