An Elongated Casing Draws Fluid Into The Progressing Cavity Pump Through A Suction Inlet

 

Progressing Cavity Pump

A Progressing Cavity Pump (PCP) is a type of positive displacement pump that can handle a variety of fluids with high viscosity, abrasiveness, and solids content. It is also known as a screw pump, eccentric screw pump, or Moineau pump. The PCP consists of two main components: a helical rotor and a stator. The rotor is a single helical screw that rotates inside the stator, which has a double helix configuration. The rotor and stator are designed to form a series of sealed cavities that move the fluid from the inlet to the outlet of the pump.

According to Coherent Market Insights, The global Progressing Cavity Pump Market was valued at US$ 1,360.7 Mn in 2021 and is forecast to reach a value of US$ 1,695.7 Mn by 2028 at a CAGR of 3.3% between 2022 and 2028.

The following is a detailed explanation of the working of a PCP.

  1. Intake: The PCP has an inlet that allows the fluid to enter the pump. As the rotor turns, the cavities between the rotor and the stator move towards the discharge end of the pump. The cavities expand, creating a vacuum that draws the fluid into the pump.
  1. Conveying: As the rotor continues to turn, the cavities move towards the discharge end of the pump, reducing in volume and forcing the fluid towards the outlet. The shape of the rotor and stator creates a progressive seal that prevents backflow and increases the pressure of the fluid.
  1. Discharge: The fluid is discharged from the pump through the outlet when it reaches the end of the rotor and stator. The pressure of the fluid is dependent on the speed of the rotor and the resistance of the fluid to flow.
  1. Repeat: The cycle of intake, conveying, and discharge is repeated continuously as the rotor turns, resulting in a continuous flow of fluid through the pump.

Advantages of PCP:

  1. High efficiency: PCP has a high volumetric efficiency due to the positive displacement principle that enables the pump to maintain a constant flow rate, regardless of the fluid viscosity.
  2. Handles high viscosity fluids: PCP is designed to handle fluids with high viscosity, making it an ideal pump for applications such as oil and gas, food processing, and wastewater treatment.
  3. Low shear rate: The PCP has a low shear rate, making it suitable for pumping shear-sensitive fluids.
  4. Minimal pulsations: The PCP produces minimal pulsations, resulting in a smooth flow of fluid and less wear and tear on the pump.
  5. Self-priming: The PCP is self-priming, which means that it can handle fluids with entrained air or gases, making it ideal for applications such as pumping liquids from underground storage tanks.

Cryogenic pumps are an essential component of many engineering constructions, and as such, the selection of a cryopump is critical to ensuring its efficiency and optimisation.

The PCP is a versatile and reliable pump that can handle a variety of fluids with high viscosity, abrasiveness, and solids content. Its positive displacement principle, low shear rate, and minimal pulsations make it ideal for applications such as oil and gas, food processing, and wastewater treatment. However, its limited pressure capacity, limited solids handling capacity, and wear and tear require careful consideration before choosing it for a particular application.

 

 

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