These workhorse pumps can be developed to handle a variety of jobs requiring pumps located within a line shaft. Engineers develop them with a variety of materials to suit the corrosive environment in which the pump must operate. Materials such as cast iron and steel alloys are used depending on strength and corrosion resistant properties. The more corrosive the conditions, such as seawater, the greater the need for super alloy steel materials.
Typical Applications
Lineshaft pumps are designed for industrial strength applications for cooling water systems in electric power generation plants. This type of pump can also be used for seawater pumping for desalination plants to produce fresh water. Pumps are also used for water irrigation systems, drainage systems, fresh drinking water supply and industrial water supply. Oil pumps are used in deep undersea bed pumping operations as well as on deep oil wells on land. Since seawater is often mixed with the oil being pumped, the corrosive effects must be factored into the engineering designs.
Axial Flow Pumps
This pump utilizes a propeller called an axial impeller. This is installed in a vertical pipe and can be driven directly by a sealed motor within the pipe or by a motor mounted to the pipe from the outside. This outside mounting allows a variety of motors powered by electric or diesel engines. The name “axial” pump is used because the fluid flow does not change in radius at the suction point and at the discharge opening. The advantage is the relatively high flow of fluids. Consequently, these pumps are capable of smaller dimensions and are still effective for many jobs such as sewage, liquid chemicals and ballast pumps used in ships and submarines.
Mixed Flow Pumps
This pump, also known as combined flow pump, generates its action from a combined force of the axial and radial actions. The advantage of this pump is the fluid is pumped by the radial acceleration and lift, yet can exit the impeller opening from 0 degrees to 90 degrees from the axial direction. Using cast-iron bronze material make this ideal for pumps delivering high flow, low-pressure requirements such as flood control. Pumps made from super alloys are ideal for high levels of fluid flow but also neutral discharge applications are used for pumping toxic chemicals, oil, and other unique applications.
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