Pump

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near the Hengsteysee, Germany.A pump is a device used to move liquids or Slurry. A pump moves liquids from lower pressure to higher pressure, and overcomes this difference in pressure by adding energy to the system (such as a water system). A gas pump is generally called a Gas compressor, except in very low pressure-rise applications, such as in HVAC, where the operative equipment consists of fans or blowers.

Pumps work by using mechanical forces to push the material, either by physically lifting, or by the force of compression.

The earliest type of pump was the Archimedes screw, first used by Sennacherib, King of Assyria, for the Domestic water system at the Hanging Gardens of Babylon and Nineveh in the 7th century BC, and later described in more detail by Archimedes in the 3rd century BC.Stephanie Dalley and John Peter Oleson (January 2003). "Sennacherib, Archimedes, and the Water Screw: The Context of Invention in the Ancient World", Technology and Culture 44 (1). In the 13th century AD, al-Jazari described and illustrated different types of pumps, including a Reciprocating engine pump, Steam engine#Double-acting engine pump with suction pipes, water pump, and piston pump.Al-Jazari, The Book of Knowledge of Ingenious Mechanical Devices : Kitáb fí ma'rifat al-hiyal al-handasiyya, translated by P. Hill (1973). Springer.Derek de Solla Price (1975). Review of al-Jazari, The Book of Knowledge of Ingenious Mechanical Devices. Technology and Culture 16 (1), p. 81.

Types Pumps fall into two major groups: rotodynamic pumps and positive displacement pumps. Their names describe the method for moving a fluid. Rotodynamic pumps are based on bladed impellers which rotate within the fluid to impart a tangential acceleration to the fluid and a consequent increase in the energy of the fluid. The purpose of the pump is to convert this energy into pressure energy of the fluid to be used in the associated piping system.

Positive displacement pumps -Ťahanovce, Slovakia (walking beam pump).

A positive displacement pump causes a liquid or gas to move by trapping a fixed amount of fluid or gas and then forcing (displacing) that trapped volume into the discharge pipe. Positive displacement pumps can be further classified as either rotary-type (for example the rotary vane) or lobe pumps similar to oil pumps used in car engines. Another common type is the Wendelkolben pump or the helical twisted Roots pump. The low pulsation rate and gentle performance of this Roots-type positive displacement pump is achieved due to a combination of its two 90° helical twisted rotors, and a triangular shaped sealing line configuration, both at the point of suction and at the point of discharge. This design produces a continuous and non-vorticuless flow with equal volume. High capacity industrial "air compressors" have been designed to employ this principle as well as most "superchargers" used on internal combustion engines.

Reciprocating-type pumps use a piston and cylinder arrangement with suction and discharge valves integrated into the pump. Pumps in this category range from having "simplex" one cylinder, to in some cases "quad" four cylinders or more. Most reciprocating-type pumps are "duplex" (two) or "triplex" (three) cylinder. Furthermore, they are either "single acting" independent suction and discharge strokes or "double acting" suction and discharge in both directions. The pumps can be powered by air, steam or through a belt drive from an engine or motor. This type of pump was used extensively in the early days of steam propulsion (19th century) as boiler feed water pumps. Though still used today, reciprocating pumps are typically used for pumping highly viscous fluids including concrete and heavy oils.Another modern application of positive displacement pumps are Diaphragm (mechanical device) pumps commonly called "Sand Piper Pumps" and are used extensively for pumping water out of an area, and they generally use compressed air as a source of energy.

Centrifugal Pumps Centrifugal Pumps are rotodynamic pumps which convert Mechanical energy into Hydraulic energy by centripetal force on the liquid. Typically, a rotating impeller increases the velocity of the fluid. The casing, or volute, of the pump then acts to convert this increased velocity into an increase in pressure. So if the mechanical energy is converted into a pressure head by centripetal force, the pump is classified as centrifugal. Such pumps are found in virtually every industry, and in domestic service in developed countries for washing machines, dishwashers, swimming pools, and water supply.

A wide range of designs are available, with constant and variable speed drives. Horizontal shafts are the most common. Single-stage pumps are usual in the smaller ratings. Pumps with up to 11 stages are in service. A demanding duty is boiler feed, and today's designs are typically 3 - 4 stage, with speeds of up to 6000 revolutions per minute.

After motors, centrifugal pumps are arguably the most common machine, and they are a significant user of energy. Given design margins, it is not unusual for a pump to be found to be over-sized, having been selected poorly for its intended duty. Running a constant speed pump throttled causes energy waste. A condition monitoring test can detect this condition and help size a smaller impeller, either new, or by machining the initial one, to achieve great energy reduction.

Pumps also wear internally, at a rate varying with the liquid pumped, materials of construction and operating regime. Again, condition monitoring can be applied to detect and quantify the extent and rate of wear and also help decide when overhaul is justified on an energy-saving basis.

Kinetic Pumps

Continuous energy addition

Conversion of added energy to increase in kinetic energy (increase in velocity)

Conversion increased velocity to increase in pressure

Conversion of Kinetic head to Pressure Head.

Meet all heads like Kinetic , Potential, and Pressure

Positive Displacement

Periodic energy addition

Added energy forces displacement of fluid in an enclosed volume

Fluid displacement results in direct increase in pressure

Application image:Dosierpumpe.gif and additivesPumps are used throughout society for a variety of purposes. Early applications includes the use of the windmill or watermill to pump water. Today, the pump is used for irrigation, plumbing, gasoline supply, air conditioning systems, refrigeration (usually called a compressor), chemical movement, sewage movement, flood control, marine services, etc.

Because of the wide variety of applications, pumps have a plethora of shapes and sizes: from very large to very small, from handling gas to handling liquid, from high pressure to low pressure, and from high volume to low volume.

Pumps as public water supplies One sort of pump once common worldwide was a hand-powered water pump over a water well where people could work it to extract water, before most houses had individual water supplies.

From this came the expression "parish pump" for "the sort of matter chattered about by people when they meet when they go to get water", "matter of only local interest".

Today, hand operated village pumps are still used in resource poor settings. A pump improves the safety of a well by protecting the water source from contaminated buckets. Pumps like the Afridev pump (pictured) are designed to be cheap to build and install, and easy to maintain with simple parts that can be sold in the local market by for-profit wholesalers. This means that a community has the resources to support its own pump, even when any charities or government funding has moved on.

Power source , Netherlands

Pumps may be powered by an internal combustion engine, electric motor, manually (as with the hand pump used for pumping groundwater, called walking beam pump), or by wind power (common for irrigation). solar energy has been used to power an electric motor, for remote locations.

See also "П3" (Pump three), manufactured in Soviet Union in 1977

Airlift pump
Beam pump and walking beam pump
Bicycle pump
Boiler feedwater pump
Breast pump
Centrifugal pump
Chain pumps
Circulator pump
Concrete pump
Condensate pump
Cyclic pump
Diving pump
Eductor-jet pump
Electropump
Fire pump and Jockey pump
Gas compressors
Gerotor
Hand pump
Hydraulic ram
Metering pump
Oil pump
Peristaltic pump
Progressive cavity pump (also known as; progressing cavity, eccentric screw or Mono pump)
Pumping station
Pumpjack (oil pump)
Rope pump
Roundabout PlayPump
Tesla turbine
Treadle pump
Turbopump
Vacuum pump
Well water pump
Wind pump

References Further reading

www.masterflopump.com - Comprehensive descriptions of different pump types
www.lightmypump.com - Pump and pump system information
Australian Pump Technical Handbook, 3rd edition, 1987, Australian Pump Manufacturers' Association Ltd
Publications of Europump and the Hydraulic Institute
Predicting maintenance of pumps using condition monitoring Ray Beebe, Elsevier, 2004

External links

Flash Animation of two lobe Roots Pump
Flash Animation of three lobe Roots Pump
Flash Animation metering pump -> push the start button!

TT Pumps - Liquids under control
T-T PUMPS, the UK's leading manufacturer and supplier of pumps, valves and control systems, including the BBA approved Package Pumping Station.

Pumps by W Robinson and Sons
Pump.co.uk the online arm of W.Robinson & Sons suppliers of water pumps, diaphragm pumps fuel pumps and sewage pumping equipment as well as parts and pumps for use in swimming ...

Pumps by W Robinson and Sons
Supply and maintenance of pumps and pumping equipment for home and business use. Main applications are drainage, irrigation, boosting and leisure. Features online shop. UK based.

AQUARIUM POND SUPPLIES,Pond Liners,Pond Pumps,Pond Filters, pond ,
Provides aquarium supplies, fish food, pond liners and supplies.

Parish Pump - The Essential Website for Church Magazine Editors!
Offers a wide range of articles and graphics for inclusion in church magazines, newsletters and on church websites. Samples provided, but the majority of the site is available to ...

Heat Pumps - Welcome to Eco Heat Pumps - Air Source & Ground Source
The sole UK suppliers of Thermia Heat Pumps. Only installs environmentally friendly heating systems.

Salamander Pumps
Salamander Shower Pumps. The fit and forget pump for plumbers. For a quiet life and peace of mind ... For a quiet life and peace of mind : Helping you choose the right pump

Heat Pumps, Ground Source, Geothermal, John Cantor, Machynlleth, UK
page description ... Introduction. This site contains useful basic information about heating-only applications with heat pumps.

Pump - Wikipedia, the free encyclopedia
A pump is a device used to move gases, liquids or slurries. A pump moves liquids or gases from lower pressure to higher pressure, and overcomes this difference in pressure by ...