What is a screw pump?
A screw pump is a type of positive displacement pump that uses two or more intermeshlng screws to pressurize fluids in order to move them in a system. The screws then push the liquid out the other side with increased pressure.
Screw pumps have their origins in the Archimedes screw, which was invented by the Greek scientist in the 3rd century BC. The Archimedes screw moved water for irrigation using a single screw that fit into a cylinder with minimal clearance. Today, few types still use this design, most use at least two screws.
Where are they commonly used?
Screw pumps are the largest type of rotary positive displacement pump and they can deliver higher flow rates than other types. They also have a variety of uses.
High powered versions are used in oil production applications to transport crude oil from an oilfield to a processing plant. In this application, one of the features is the pumps ability to handle fluids mixed with gases. Produced oil often includes natural gas, so these pumps are used to ensure the gas doesn’t have to first be separated from the crude oil before the product is pumped to a processing plant.