Friday, September 9, 2016

Twin Screw Pumps As A Type Of Multiphase Pumping Technologies

By Laura Smith


A technology that is used in transferring fluids like slurries, liquids, or gases is called a pump. This has three major groups namely the direct lift, the displacement, and the gravity pumps. The one that moves fluid by trapping the fixed amount of fluid and displacing it in the discharge pipe is called the positive displacement.

Gravity pump is usually referred as a hydraulic ram. This is used by raising the water from the underground to a higher location in lower elevations. Multiphase pumping technologies types and features include buffer tanks, twin screw pumps, helicoaxial, progressive cavity, and electric submersibles. Multiphase production advantages include lesser cost of the equipment, increase in the rate of production, and simpler installation.

Helicoaxial is also referred to as centrifugal. This will work by converting the rotational kinetic energy into a hydrodynamic energy to transfer fluids. The electric motor releases a rotational energy, and the fluid that enters will be accelerated outwards by the impeller which is located near the rotating axis.

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.

A progressive cavity is one kind of positive displacement. The progress of small, discrete cavity, and fixed shape sequence is being used while turning the rotor. This can act also as motor or mud motor if the fluid is pumped in the interior. An application to this is doing a well drilling.

Electric submersibles contain hermetically sealed motor that is close coupled to its pump. The assembly is being submerged to the fluid which is being pumped. The advantage of this is the prevention of cavities, that is a problem in the difference of the fluid surface and of the pump. Submersibles pump liquids towards the surface. Jets pulls liquids out from the surface, so it can be concluded that submersibles are more efficient compared to jets.

A buffer tank Cobourg ON is installed in the upstream of the suction nozzle in case of slug flows. This breaks the energy of liquid slugs, smoothens fluctuations in incoming flows, and act as sand traps. Pumps are mostly rated in its horsepower, outlet pressure of its head, inlet suction of its head, and flow rate. The head is simplified as the number of meters or feet that the pump raises or lowers the column of water of atmospheric pressure.

Stainless steel and other materials such as cast iron are mostly used for pump production. Materials depend on how it is going to be used. For pharma application of water industries, they use stainless steel instead of cast iron because it gives better outcome due to its high temperature.

By the name multiphase, variations of this when it comes to conditions and services are being applied. These conditions include process changing of liquid composition, temperature variations, low and high pressure operations, and erosive or abrasive media exposure. So the challenge is to select appropriate support system and mechanical seal arrangement to know how effective it is.




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