What is a Progressive Cavity Pump?

In cases of rugged applications, the pumping unit works following the positive displacement method.

And the role of the progressive cavity pump executes tough operations to transfer sticky fluids.

This type of pump has a specific design for high-end operation in versatile ways for pumping wastewater with chemical dirt.

For certain designs and the involvement in particular operations, you can consider it as a heavy-duty industrial pump.

What Is The Core Working Method Of Progressive Cavity Pump?

While you follow the working principle of the PC pump, you will find great similarities with positive displacement pumps.

The top-to-bottom mechanism of this pump makes it a perfect device for hassle-free flow creation.

The most wonderful matter like consistency in speed will push you to trust the resilient mechanism of the PC pump.
The pressure fluctuation on the inlet end never affects the speed consistency while it operates the fluid movement.

The involvement of suction inlets plays a vital role while a progressive cavity pump operates the movement of fluids.

The suction inlet feeds the extended casing. The casing contains the assembly of stator and also helical rotor.

The helical rotor executes the offset technique to the stator. During taking the turn, the rotor comes into contact with the stator surface.

In the meantime, this particular mechanism creates a sequence of tiny cavities generated.

These cavities make the fluids progressive and execute the process to expel the fluid using a discharge outlet.

The mechanism of the rotor and stator generates a particular amount of heat.

So, the recommendation does not allow PC pumps to run without water.

Dry running will cause severe pump failure. Most of the PC pumps involve particular accessories to safeguard the pump from dry running.

Moreover, you will find lots of similarities between the progressive cavity pump and the self-priming pump mechanism.

In every phase of operation, the PC pump has to deal with high pressure. And in terms of pressure, it crosses the range of the positive displacement pump.

As well as the mechanism of this pump also involves a high suction lift.

What Are The Essential Features of Progressive Cavity Pump?

Positive Displacement Mechanism

To deliver a balanced, controlled, and non-pulsating flow of fluids, PC pumps generate cavities. And in the whole process of cavity generation, the essential elements work through the single rotation process.

The progressive head works independently without any consideration of rotational speed. But the capacity of flow remains proportionate with speed.

Self-Priming Technology

In nature, the PC pump works following the self-priming method.

Without any requirement of a foot valve, a progressive cavity pump runs with a grunting sound.

Anti-Clogging Features

In the phases of suspension, this type of pump can carry solid. So, to move the fluids, which contain high amounts of solids, the PC pump works best.

Less Requirement of NPSH

As a progressive cavity pump has a maximum suction lift capability, this pump runs with less NPSH requirement.

And this speciality makes this kind of pump more effective to execute the high-end operation in high vacuum conditions.

Lower Amount of Internal Velocity

The whole mechanism reflects high-end pumping operation utilizing the shear-sensitive media.

The minimum range of degradation of this media works best to carry viscous fluids, which have pseudo-plastic nature.

Reverse Mechanism

Regardless of any direction, a progressive cavity pump can work with the same efficient methods. So, the industries get the benefits of reversible power of rotation.

Soundless Running

This pump runs the rotors inside the resilient stator, so it only creates a small amount of snoring.

In Which Circumstances You Need Progressive Cavity Pumps

For having robust mechanisms and versatile features, PC pumps always serve the needs of a large number of pumping applications.

The sturdy integration of this pump always offers the great benefits of a positive displacement pump.

Therefore, it reflects the advantages of specific designs to resist corrosion during rugged applications of pumping.

Now take a look at the specific conditions while you should think about installing a progressive cavity pump.

High Viscosity

While the mechanism of the centrifugal pump fails to provide a standard pumping solution, PC pumps meet the critical needs of pumping.

If you want to get the point with more vividness, then concentrate on the level of viscosity of the fluids. For having a high viscosity concentration, the mechanical limitation of centrifugal pumps can not execute the operation with proper efficiency.

In those cases, PC pumps reflect high efficiency to carry the liquids having an extreme thickness.
In cases of centrifugal force, due to lack of volumetric efficiency, with the increment of fluid viscosity, the flow becomes low, and power consumption becomes high.

But, in PC pumps, due to the efficient mechanism as viscosity increases, volumetric efficiency starts to grow up.
So, a progressive cavity pump is ideal for the applications of high viscosity-based fluids. So, if you need robust pumping operation with constant flow, the PC pump can meet the purpose.

As the variable viscosity of the fluids can not affect the performance of this type of pump.

Varying Flow

When the applications have a great requirement for varied flow, a progressive cavity pump controls the actual water flow rate.
Therefore, it follows easy and flexible methods to regulate the flow during pumping operation.

The speed controllers of the latest designed PC pump work with multiple frequency drives, which suits the operation requirement.

So, for the perfect balance between pumping speed and flow controlling system, progressive cavity pump works the best.

Suction Based Conditions

If you need a recommendation, while you should use a progressive cavity pump, you must keep in mind different suction conditions.

While the suction conditions do not suit the required operations, PC pumps meet the purposes, as this type of pump has lower NPSH.

Compared with centrifugal pumps, the lower-ranging Net Positive Suction Head of PC pumps operates the fluid movement for having lower internal velocity.

If the suction pressure reaches nearby 28”, the centrifugal pump fails to operate.

In that case, you need to install a capable PC pump.

So, the PC pumps can rectify the reasons for the failure of the centrifugal pump and can fulfill the need of particular operations.

Separation of Fluids

The utter sensitive fluids create a low amount of internal velocity inside the pump during applications.

And the mechanism of the progressive cavity pump plays a better role following the separation methods to separate oil droplets from the water mixture.

Even in large oil droplets, the separation device of the PC pump enhances the performance of the separator.

Abrasive Solids

In most cases, where fluids contain abrasive solids, the progressive cavity pump performs the best.

A positive displacement pump mechanism fails to reflect the efficiency to pump fluids with solids in the proper manner.

The overall metal design of the positive displacement pump and limited tolerances can not carry abrasive solids for a long time.

But the PC pump has a specific designed rotor and stator in the heart of the pump to resist the abrasion directly.

The rubber-made stator prevents the abrasive particle from coming close to the surface of the stator.

So, the specific design of the progressive cavity pump increases the performance of the pump itself.

The above discussions prove that using a progressive cavity pump saves expense, time in the cases of critical applications, and sturdy design make this pump reliable for different applications.

Author

Mike Brown has done Masters in Hydrology and Water Management. He loves coffee and likes to lecture people on climate change. He plays PUBG when he is not working.

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