Drag pumps are rotodynamic machines in which the mechanical energy of a moving a rotor (Dragpeller) is transferred to a fluid through the boundary layer. The fluid enters the pump in the axial direction (parallel to the shaft and perpendicular to the rotor) through the pipe and immediately suction fluid is positioned between the two parallel and rotary plates that form the dragpeller. Once in this position, the fluid particles that are in direct contact with the plates acquire the same velocity as the rotating plates, there is no relative motion between adhering particles and solid surfaces in motion.

The condition of not sliding on the surface generates the maximum value of shear in the fluid and in turn causes the fluid layers to acquire the necessary energy transmitted by the Dragpeller. Once the first layer is energized by molecular diffusion (thanks to fluid viscosity) it transmits its energy to the second layer.

This phenomenon of energy transport is being produced from layer to layer until all of the fluid within the dragpeller is kinetically energized. The fluid aquires kinetic energy from the nearest layer of the surface to the outermost layer (midpoint of interspace). Once all fluid in this space has acquired sufficient kinetic energy it then exits the dragpeller and will address the case where the kinetic energy is converted into pressure energy, directed to the discharge section and then exits the pump.


Dragpump Qualities

Dragpumps have a very important quality that differs them greatly from other rotodynamic and centrifugal pumps, the viscosity. Given that the most important physical property in this type of physical pump is the viscosity, these pumps behave hydro-dynamically better when the fluid is viscous. That is to say, if you need to pump a viscous fluid, such as heavy and extra heavy crude, drilling fluids, waxes, bitumen’s, polymer melts, glycerin, oils, lubricants, paper pulp, wastewater, slurries, etc., Dragpumps are the best option.

In addition, other advantages of this technology for the transportation of fluids are the following:

These pumps have the ability to handle solids because of the bladeless mechanism that allows the suspended solids to travel through the pump without any contact with the Dragpeller. This brings several advantages; first the abrasion is minimized because the dragpeller is almost untouched by solid suspension. Another advantage is the non-deformation of delicate solids; they travel through the pump without experiencing heavy damage
When you have multiphase flows; when the flow pattern contains bubbles, spherical particles immersed in the gas stream travel within the liquid, it then enters the Dragpeller and the kinetic energy is transferred to the continuous medium, acquiring all the energy needed to exit the pump and be transported to the desired location.
In Dragpumps, the fluid is impulsed by the dragpeller in a soft manner, free of any impact, this creates a continuous flow free of impingement, which results in the mechanical vibrations of the equipment to be greatly reduced.
The Dragpeller is the only element responsible for supplying energy to the fluid shear stress generated in the circular plates and their veins. Radial loads generated by the fluid are small and therefore the radial loads on the mechanical components of the pump are small, obtaining the best durability.
Dragpumps do not emulsify the transported mixture. For example, many crude oil applications in the petroleum industry require complete separation of crude oil from water. When there is a flow of humid crude oil, there will most likely be a stream of pure water flowing in the pipeline (which can be separated from crude oil by applying mechanical or thermal methods) and another percentage of water will be molecularly mixed with the crude oil, the mixture is known as emulsion.
Another feature and advantage of Dragpumps is their low levels of NPSH, values that are below those presented by centrifugal pumps due to the impingement free plate technology.

Dragpeller ®

The Dragpeller® is the rotating element in our drag pumps where transformation of mechanical energy into hydraulic energy occurs. It uses the boundary layer principle (Theory developed by Prandtl) and the same physical principle used by Nicola Tesla in "Tesla Turbomachinery" in the early XX century. The principle of operation is the same, however substantial improvements are introduced with our dragpeller like efficient energy conversions and of course, less consumption of mechanical and electrical power.


Basically, it is geometrically formed by two parallel circular plates that cut on the same axis and are connected rigidly by elements called blade posts. Each one of the plates has a number of elements attached that help generate an apparent rough surface and therefore, according to rheological model fluid pumping generate more shear and increase the transport amount of movement. These elements are called "High efficiency dragpeller vanes" (HEDV). The geometry of these elements, in terms of drag factor, centrifugal effect and aerodynamic tail ensure much higher energy efficiency than other impeller pumps with similar technologies. For such applications, our Dragpumps have efficiencies up to 15% greater than the efficiencies of pumps with similar technologies. In other words, if we operate a Dragpump that consumes 500 HP of power, in the same application, our competitors pump energy consumption would be approximately 575 HP, that is 75 HP more, which equals 56 KW. Annually, our dragpeller saves approximately 90,560 KW-hr.