A simple type of vertical centrifugal pump having one or more stages or bowls, which are supported from the motor head on the surface by means of screwed or flanged column pipe sections, each usually 10 ft (3 m) long. The line shafting from the motor to the impellers is sectional to correspond with the column section, and may operate in a sectional extra-heavy enclosing tube if oil is used as a lubricant, or may be exposed to the water when the pump is built to be water-lubricated.