Overview of Screw Pumps

A screw pump operates through the rotation of screws within a cylindrical space, facilitating the movement of fluid from the suction side to the discharge side. The close clearances between the screws and the liner result in pressure buildup as the fluid traverses the pump.

Varieties of Screw Pumps

Screw pumps come in diverse designs, including:

– Car Lift Repair Tampa Florida Single Screw Pump: Often known as Progressive Cavity Pumps, featuring a single shaft twisted like a screw within a rubber-lined chamber.

– Two Screw Pump: Also called twin screw pumps, commonly used for high-power applications like heavy oil transfer, with one screw being driven while timing gears rotate the second screw.

– Three Screw Pump: Known as triple screw pumps, typically employed in smaller tasks like lubrication systems, with one screw being driven and rotating the other two without timing gears.

– Four Screw Pump: Similar to the two screw pump but with two screws per rotor, suitable for multi-phase applications and oil transfer pipelines, employing timing gears to drive the second rotor.

– Five Screw Pump: Comparable to the triple screw pump but with five screws, often utilized in lube oil or hydraulic applications.

Differentiating between Two Screw Pumps and Four Screw Pumps can involve considering them as “Double Suction” or “Single Suction” types, depending on whether the suction stream splits to both ends (double suction) or enters and exits from opposite ends (single suction).

Functioning of Screw Pumps

Car Lift Repair Tampa Florida Screw pumps belong to the Positive Displacement Pump category, displacing fluid continuously as the screws rotate within a metallic liner. While viscosity ensures minimal slippage for high-viscosity fluids, lower viscosity fluids may experience significant slippage, impacting pump efficiency. Tight clearances are crucial to mitigate slip, especially in multi-phase applications.

Applications of Screw Pumps

Car Lift Repair Tampa Florida Screw pumps find utility across various industries, such as Manufacturing, Mining, and Oil & Gas, particularly in scenarios involving high-viscosity or multi-phase fluids. Examples include hydraulic and lubrication systems, heavy oil pipeline transportation, and multi-phase pumping challenges like Gas Well Deliquification and Propane Cavern Storage in the Oil & Gas sector.

An irrigation pump in Egypt, 1950s

The Car Lift Repair Tampa Florida crew pump stands as the oldest known positive displacement pump. Records dating back to ancient Egypt before the 3rd century BC highlight the first instances of a water screw or screw pump. The Egyptian iteration featured tubes wound around a cylinder, which, upon rotation, lifted water from the Nile. This early design evolved to include a spiral groove cut into a solid wooden cylinder, covered by boards or metal sheets. An interpretation of a cuneiform inscription from Assyrian king Sennacherib (704–681 BC) suggests the casting of water screws in bronze, preceding classical references by Strabo describing the Hanging Gardens as watered by screws.

The introduction of the Car Lift Repair Tampa Florida screw pump from Egypt to Greece occurred later. Archimedes, during his visit to Egypt circa 234 BC, described the apparatus, indicating its novelty to the Greeks during the Hellenistic period.


The screw pump manifests in three primary forms:

1. Archimedes’ Screw Pump: In its simplest form, a single screw rotates within a cylindrical cavity, scooping and progressively moving material along the screw’s axis until discharge. This ancient design persists in low-tech applications like irrigation systems and agricultural machinery.

2. Modern Screw Pump: Utilizing two screws, this design squeezes material against each other to facilitate movement.

3. Progressive Cavity Pump: This variant employs eccentric spinning of the screw to press material against the cavity walls.

All forms of screw pumps operate on the principle of trapping and moving material. The configuration of screws and cavities varies to suit different applications, materials, flow rates, and pressures.

One common configuration is the three-spindle screw pump, where three screws create pockets of pumped liquid in their grooves. These pumps excel in transporting viscous fluids with lubricating properties, finding application in fuel injection, oil burners, hydraulics, and marine installations.

Advantages of Car Lift Repair Tampa Florida screw pumps include axial fluid movement without turbulence, minimal foaming in viscous fluids, consistent flow rates even with changes in pressure, and reduced back-drive on the power axle, resulting in a steady output with minimal pulsation.

The screw pump belongs to the dry compressed gas transfer pump series and operates as a positive displacement pump utilizing one or more screws to propel fluid or water along the screw shaft. These interlocking screws pressurize the fluid, moving it through the system by reciprocating within the cylinder cavity. Explore the descriptions of various pumps for further details.

How does a Car Lift Repair Tampa Florida crew pump function?

A screw pump functions with two counter-rotating screw rotors meticulously designed to rotate “toward each other,” effectively trapping gas within the space between the rotor screws. As these screws rotate, the trapped volume diminishes, compressing the gas and propelling it towards the exhaust port.

Upon initiation of the progressive cavity pump, power is transmitted to the drive screw via an electric motor. The drive shaft connects to the screwdriver responsible for driving the screws.

As the drive screw commences rotation, the driven screws also turn, engaging one another in the process. This motion generates a minimum vacuum in the inlet section, drawing fluid into the pump through the inlet valve.

Upon entry into the pump, fluid becomes trapped between the gaps in the screws and moves along with their rotation. As the screws rotate, the volume of trapped fluid decreases while its pressure increases.

Once the fluid reaches the desired pressure, it is discharged from the outlet valve and directed to the intended location.

In scenarios where a screw pump is employed to pump oil or viscous fluids, the screw surfaces are lubricated during operation, resulting in minimal or no clearance between the screws.

However, when handling gas/water mixtures, water, or other light liquids, contact between these components must be avoided to prevent rapid wear. Hence, it’s advisable not to use a triple screw pump (where one screw drives the other two without gears) for water supply or multi-phase operations.