Three-Screw Pumps are suitable for group 1 liquid types. Three-screw pumps have only one bearing, internal or external, adjacent to the coupling. Three-screw pumps are available in either single or double end construction. Three-screw pumps are generally lined construction. Three-screw pumps are widely used in pumping fuel oil of various viscosities. Three-screw pumps generate some axial loads. Three-screw pumps are designed to give pulsation-free delivery. Three-screw pumps are commonly used for machinery lubrication, powering hydraulic machinery and conveying high temperature viscous products in refineries.