Tuesday, September 6, 2016

Twin Screw Pumps As One Of The Types Of Multiphase Pumping Technologies

By Laura Smith


Pumps are used for moving fluids, such as liquids, slurries, or gases. Three major groups of this are the displacement, direct lift, and gravity pumps. Positive displacement transfers fluid by trapping a fixed amount of it then displacing that amount into the discharge pipe.

Gravity pumps are referred to as hydraulic rams. These work by getting water from under grounds and raising it to higher places but in lower elevations. Multiphase pumping technologies have features and types namely the helicoaxial, progressive cavity, twin screw pumps, buffer tanks, and electric submersibles. Multiphase production benefits include smaller and simpler installation, production rate increase, and lower cost of equipment.

A helicoaxial is also called as centrifugal. Centrifugal is used by transporting fluids through converting rotational kinetic energy into hydrodynamic energy. The rotational energy comes from the electric motor, and the fluid will then enter the impeller which is near the rotating axis, and the impeller is going to accelerate it, flowing outwards.

A twin screw is consists of two intermeshing screws that force the movement of fluid that is being pumped. This is often used in pumping conditions that contain a high gas volume or fluctuating inlet conditions. To seal the two shafts, it needs four mechanical seals.

Progressive cavity is one type of the positive displacement. Sequence progress of small, fixed shape, discrete cavities is used in this type while the rotor is turned. This also acts as motor or mud motor if the solution is being pumped through the interior. Well drilling can be one good application for this.

An electric submersible has a motor which is sealed hermetically and that is close coupled to a pump. Its construction is been submerged to the pumped fluid. One advantage of submersibles is that it can prevent cavities, a common problem between the difference of fluid surface and pump. Submersibles pump the liquids to the surface, while the jets pull the liquids, so it is more efficient to use submersibles.

Buffer tanks Cobourg ON are installed upstream of suction nozzle in case of a slug flow. This will break the energy of the liquid slug, will smoothen any fluctuations of incoming flows, and will act as a sand trap. Pumps are usually rated by horsepower, flow rate, outlet pressure of head, and inlet suction of head. Simplification of head is done as the number of feet the pump can raise or lower a column of water in atmospheric pressure.

Cast iron, stainless steel, and other materials are commonly used in pumps. Materials that will be used will be dependent on how it is to be applied. Water industries in pharma application uses stainless steel because it provides better result, and this is because of its high temperature.

So by the name itself, multiphase have many variations of services and conditions like changing composition of liquid processes, temperature variations, operating high and low pressures, and exposure to abrasive or erosive media. So the challenge for this is to look for appropriate arrangement of mechanical seal and support system to ensure effectiveness and also to ensure quality as well.




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