Tuesday, May 17, 2011

High Pressure Pumps And Their Utility

The pumps which can produce fluid flow with a minimum pressure of 800 psi are generally referred to as high pressure pumps. The high pressure pump can be broadly categorized into three types depending on the pressure levels. They are moderate high pressure pumps, very high pressure pumps & ultra high pressure pumps whose pressure range varies a lot. The ultra modern high pressure pump is the most powerful kind of pressure pumps that can create liquid discharge with a pressure range of 10,000 psi to 40,000 psi. Next are the very high pressure pumps that make fluid discharge with a pressure falling in the range of 3000 psi to 5000 psi. And finally come the moderate high pressure pumps that cause discharge with a pressure level falling anywhere in 800 and 3000 psi
Plunger pumps are a special kind of high pressure pumps that are widely used in high pressure application. They are also referred as reciprocating positive displacement pumps. However pistons are used along with high pressure pumps in the applications requiring discharge pressure under the level of 1000 psi. The tiplex plunger pumps is another commonly used variety of positive displacement pump which finds maximum use in high pressure applications. A single prime mover drives all the three plungers present in a triplex plunger pump. The triplex high pressure pump acquires a high discharge capacity due to the parallel use of three plungers which brings a pressure increase each time the prime mover rotates for 120 degrees. The quintuplex plunger pump is another reciprocating high pressure pump that shows high pressure pumping activities. In this kind of high pressure pump, a single prime mover runs the pump consisting of four plungers. Both the triplex pumps & quintuplex plunger pumps are popularly used high pressure pumps with maximum use in high pressure applications.
Positive displacement rotary pumps are pumps that move fluid using the principles of rotation. The vacuum created by the rotation of the pump captures and draws in the liquid. Rotary pumps are very efficient because they naturally remove air from the lines, eliminating the need to bleed the air from the lines manually. Positive displacement rotary pumps also have their weaknesses. Because of the nature of the pump, the clearance between the rotating pump and the outer edge must be very close, requiring that the pumps rotate at a slow, steady speed. If rotary pumps are operated at high speeds, the fluids will cause erosion, much as ocean waves polish stones or erode rock into sand. Rotary pumps that experience such erosion eventually show signs of enlarged clearances, which allow liquid to slip through and detract from the efficiency of the pump. Positive displacement rotary pumps can be grouped into three main types. Gear pumps are the simplest type of rotary pumps, consisting of two gears laid out side-by-side with their teeth enmeshed.
The high pressure pumps driven by hydraulic amplifier or intensifier are increasingly used these days in high pressure application areas. These pumps are based on hydraulic pressure to bring significant increase in the pressure rate with which fluid is bring pumped through. The amplifier or intensifier mainly consists of a single rod joining two pistons with varying bore sizes. When the hydraulic pressure applies to the larger piston, it brings movement in the smaller piston. Again the high pressure fluid discharge rate is guided by the direction in which the hydraulic piston moves the smaller piston. It may either suck or create immense pressure to discharge the fluid at high pressure. High-pressure applications such as reverse osmosis desalination, foam firefighting, as well as pumping of high vapor liquids & liquid CO2 are where high pressure pumps find maximum use. The use of water pumps in water jet cleaning systems plus water jet cutting systems is a good example of it.
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Sanjay providing roto pump , high pressure pump and plunger pump
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