Vertical Cantilever pumps are designed for installation in a sump or tank where it is desirable not to have a bearing in the pumpage, having only the casing and impeller submerged in the pumpage for priming. The support bearings for the rotating element are located remotely above the pumpage in a dry environment. There are no throttle bushings, bumper bushings, or rings of any type located at the impeller or submerged below the maximum normal water level.

All casings are heavy walled for long life. Enclosed impellers are available with front and back repelling vanes to minimize axial thrust loading and reduce recirculation. All impellers (except Refrax®) are keyed to the pump shaft and secured using an impeller nut. Impeller clearances are easily adjustable at the thrust bearing location. No foot valves are used. The pumps are capable of operating dry with no adverse effects.

click for Casing and Impeller Configuration Options

Design Features

All shafts are designed to operate approximately 30% below the first critical speed. Shafts are sized so that the pump can operate from zero flow to full run out; therefore, the complete capacity-head range is available without restriction. The shafts are machined and finished throughout the entire length so that the total indicator runout is not more than .005" at the impeller bore. Heavy duty, anti-friction type, thrust and radial bearings are located in all pumps, above the maximum normal water level. These bearings accomodate all axial and radial loads without transmitting any loads to the driver. Static and dynamic balancing of the entire rotating element is available.

Grease lubrication is standard, although oil mist, forced oil, or internally circulated self contained oil lube systems are available. Both v-belt and direct drive motors are an option.

Mounting Arrangements

Cantilever pumps are avaliable in base, hip, or shoulder mounted arrangements, based on the depth of the sump or tank and the maximum mormal and minimum water levels. The most common design for a Cantilever pump is the base mounting, where the bearing frame is mounted above the cover plate. This arrangement is typically used when high temperature fluids or toxic liquids are being handled, as a sealing device is required at the cover plate.

Suction Tailpipe