A single screw pump is a rotary pump called a screw pump. The single screw structure of the pump and the positive displacement pumping method make the pump have a wide range of applications. The screw pump has a rotor with external threads and a stator with internal threads.

In the simplest form of a screw pump, the single-threaded internal member (rotor) rotates within the double-threaded external member (stator). The geometry of the rotor and the stator creates a cavity between the rotor and the stator.

In each turn of the rotor, two cavities are formed that extend from one end of the rotor and the stator pair to the other. In most screw pumps, the stator is made of an elastic material, while the rotor is made of a rigid material.

Screw pumps are also available with rigid stators, which are mounted on the rotor at a certain gap.

The advantage of screw pumps is the variety of fluids, flows and pressures they can serve. This is a highly diverse pump classification.

For example, they are capable of pumping liquids with viscosities from less than 1 centistoke (cSt) to more than 430,000 cSt.

They can handle fluids containing abrasives and solid particles up to 9 cm (3.5 in) in diameter, and can handle multiphase fluids with gas content up to 99%.

They are self-imbibition and can inhale up to 8.5 meters (28 feet) of liquid.

They can be used to pump almost any fluid compatible with the structural material.

Some smaller screw pump models operate at up to 1,800 revolutions per minute (rpm), but most industrial pump models operate at 150 to 600 rpm. Low operating speeds and rotor and stator designs allow them to handle fine and shear-sensitive fluids without causing any damage to the fluid.

The screw pump has a flow rate of up to 850 cubic meters per hour (m 3 /h) (3,750 gallons per minute (gpm)). Standard industrial models offer differential pressure capabilities up to 70 bar (1,040 pounds per square inch (psi)).

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