Progressing Cavity Pump

The progressive cavity pump consists of a rotating cork-screw like sub-surface assembly which is driven by a surface mounted motor. Beam pump rods are used to connect the two. The flowrate achieved is mainly a function of the rotational speed of the subsurface assembly. There Is in principle very little that can go wrong with progressive cavity pumps. Progressive cavity pumps excel in low productivity shallow wells with viscous crude oils and can also handle significant quantities of produced solids. 

An emulsified fatty acid soap (e.g., magnesium or iron tallate, having between 8 and 18% metal content. This type of product is cationic and may exhibit some partial solubility in both oil and water. It can be fed by pump (usually a progressive cavity pump or a screw pump). 

The down-comer from the gas/liquid separator that collects the liquid slurry product is connected to the suction side of a moyno-type (Liberty progressive cavity) pump. The pump discharge is connected to a primary separation device (an inertial separator similar to a hydrocyclone). Since the slurry pump is a positive displacement device (i.e., no slurry slippage inside the pump), the total flow... 

Programming languages, 7 485-491 Progressive cavity pumps, 21 73-74 Progress, management systems to sustain, 10 166... 

Progressing Cavity Pumps, Downhole Pumps, and Mudmotors, Lev Nelik... 

A third type of pump is used largely for pumping at high rates, often with a white liquid color.This is a progressive cavity pump. Like the gear pump, it is very linear and can handle high viscosities. It has a convoluted tubular stator and a convoluted rodlike rotor, which intermesh, moving the liquid forward, much like an extruder screw. 

Figure 20.2, Typical liquid color pumps (a) peristaltic pump (b) detail of peristaltic pump head showing tubing (c) high-volume progressive-cavity pump. 

A similar system was already commercially available for a different application. A progressive cavity pump for feeding was placed in the bottom outlet of the feed reservoir [19]. It was claimed that the feeder delivered slurries of 0.5 to 6% (5-60 g/1) cellulose. This is remarkable because we were never able to suspend more than 30 g/1 of cellulose in a vessel no data were presented to support the claim. 

Finally, the progressive cavity pump uses a rotating member inside a molded cylinder that together form a cavity that moves from input to output as the centre is rotated. This pump can handle very viscous oils and debris, but is heavy and more expensive than other types of pumps. 

Figure 18. Progressive cavity pump system. (Reproduced with permission from reference 25. Copyright 1991 Amoco Canada Petroleum Ltd.)...

The product classification in the elutriation leg is operated under flow rate control without automatic feedback from the product CSD. The rate of slurry discharge is set by the level control loop, responding to the differential pressure generated by the varying slurry-gas interface. A progressive cavity pump is the final control element to achieve the level control while providing minimal degradation of the crystals in the product slurry. 

Rotary screw pumps (Progressing cavity pump moyno pump) for shear sensitive slurries particle diameter < 5 cm., temperature < 80 °C fluid viscosity, usually above 10 Pa.s head 0.2 to 300 m < 125 L/s self priming minimum foaming pulsation-free flow. Tends to be a constant volume device. 

Progressing cavity pumps. These are self-priming positive displacement pumps which have a helical metal rotor lying inside a flexible tubular stator. The rotor maintains a continuous seal along the length of the stator and as it turns it forces the fluid through the stator to discharge. 

To meter the two flows, a flow meter, a variable orifice meter or eddy current or sonic flow meter, for the water is generally used, and a metering pump, generally a progressive cavity pump, is used for the polymer. Unlike for solid polymer make-up. for dispersions the make-up plant is the same basic design for all sizes unless It is to be made up by hand, which is possible for small test runs. 

In decanter work usually a progressive cavity pump... 

The group of rotating positive displacement pumps comprises a lot of different versions. When setting a borderline for high-pressure usabUity at 10 MPa, only the gear pumps (70 MPa), the screw pumps (32 MPa), and the progressing cavity pumps (15 MPa) remain. The basic conveying characteristics of these pumps can be... 

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