There have two type screw pumps: 1. Single Screw Pump. 2. Three Screw Pump 1. single Screw Pump usually been used to transfer sludge, mud, sauce etc thick liquid. 2. three screw pump usually beed usde to transfer the temperature not higher than 150 degree diesel fuel oil, lubricating oil etc oil. and heat insulation triple screw pump beed used to transfer bitumen, heavy oil etc, pump can bear 300 degree high temperature.