Lineshaft pumps are rotodynamic pumps driven be extended rotating shafts, and per Hydraulic Institute (ANSI/HI), continuously imparting energy to the pumped fluid by means of a rotating impeller, propeller, or rotor. Lineshaft pumps are axial flow, mixed flow or radial flow impeller pump types, which can be driven by electric motors or internal combustion engines. All vertical lineshaft pumps are sometimes referred to a vertical turbine pumps.
Vertical lineshaft pumps are used in deep well, short setting, or barrel/can applications and in either wet pit or dry pit pump stations. These lineshaft pumps can be configured for above floor or below floor discharge, and are segmented, comprised of the pumping element or pump bowl assembly, column segment(s), discharge elbow, and driver stand. Vertical lineshaft pumps are proven as reliable pumps in industrial, municipal and agricultural pumping applications.
One critical aspect in lineshaft pumps is lubrication of the shaft bearings (bushings). The Lineshaft Pumps has an extended length rotating shaft which is supported and aligned by radial bearings. Lineshaft pumps may have open shafts or enclosed shafts depending on the bearing protection required and the lubrication method utilized. Pump lineshaft bearings can be product-lubricated, being lubricated by the water being pumped. In relatively clean water applications, this is the most reliable, durable, and cost effective method. Pump lineshafts can also be fully enclosed, and lubricated by oil, isolated and mechanically sealed from the pumped fluid.
Axial Flow and Mixed Flow Pumps
Axial Flow and Mixed Flow Lineshaft Pumps are single stage, high-efficiency pumps for pumping requirements less than approximately 70 feet of total dynamic head. Axial flow lineshaft pumps are ideal for heads below 25 feet, and generate head exclusively through axial forces and defined by having specific speeds of above 10,000 in US Units. Mixed flow lineshaft pumps are ideal for high capacity pumping at heads from 25 to 70 feet, generating its head from a combination of axial and radial forces and are defined by specific speeds between 4,200 and 9,000 in US Units.