Griswold 811 Series Centrifugal Pumps Designed for Harsh Chemical-Process Applications

Griswold has a long history of setting the standard in this industry as its 811 pumps were among the first pump designs to meet ANSI standards in the 1970s.

The 811 ANSI Series pumps meet the needs of chemical processors because they have two times the area in their casing and stuffing box/seal clearance areas, which optimizes the performance of the pump’s open impeller. This open-impeller design feature also minimizes concentrated wear by balancing the hydraulic axial thrust load and reducing the stuffing-box pressure. This not only facilitates corrosive, abrasive, solid and stringy-fiber handling, but also simplifies maintenance, extends pump life and reduces repair costs.

These pumps also meet a diverse array of chemical-process applications because their casings can be constructed of a wide choice of materials, including ductile iron, 316 stainless steel, CD4MCu and alloy 20. They are constructed through investment and no-bake casting processes to ensure smooth, precise, superior finished that guarantee consistent, reliable performance. Griswold also employs metallurgists to strictly supervise all heat-treating operations so that maximum corrosion-resistance for all alloys is ensured.

Other features of the 811ANSI Series are self-tightening impellers that reduce leaks and failures; the ability to externally adjust the clearance so that peak efficiency is ensured even after wear-area loss; back pump-out vanes that reduce pressure on the shaft seal and bearings; and investment-cast impellers that are ultra-smooth to guarantee hydraulic and mechanical balance, and maximized seal and bearing life.