PUMP

Contents

1 Pump 11.1 Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.1 Positive displacement pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.1.2 Impulse pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81.1.3 Velocity pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81.1.4 Gravity pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91.1.5 Steam pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91.1.6 Valveless pumps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

1.2 Pump repairs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101.3 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

1.3.1 Priming a pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101.3.2 Pumps as public water supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111.3.3 Sealing multiphase pumping applications . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.4 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121.5 Pumping power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121.6 Pump efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121.7 See also . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131.8 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141.9 Further reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141.10 External links . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2 Dosing 262.1 In engineering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262.2 In agriculture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262.3 Aerial spraying . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3 Reciprocating pump 273.1 Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273.2 Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273.3 See also . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273.4 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273.5 Text and image sources, contributors, and licenses . . . . . . . . . . . . . . . . . . . . . . . . . . 30

3.5.1 Text . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

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3.5.2 Images . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303.5.3 Content license . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Chapter 1

Pump

For other uses of “pump” or “pumps”, see Pump (disambiguation).A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action. Pumps can

be classified into three major groups according to the method they use to move the fluid: direct lift, displacement, andgravity pumps.[1]

Pumps operate by some mechanism (typically reciprocating or rotary), and consume energy to perform mechanicalwork by moving the fluid. Pumps operate via many energy sources, including manual operation, electricity, engines,or wind power, come in many sizes, from microscopic for use in medical applications to large industrial pumps.Mechanical pumps serve in a wide range of applications such as pumping water from wells, aquarium filtering, pondfiltering and aeration, in the car industry for water-cooling and fuel injection, in the energy industry for pumping oiland natural gas or for operating cooling towers. In the medical industry, pumps are used for biochemical processesin developing and manufacturing medicine, and as artificial replacements for body parts, in particular the artificialheart and penile prosthesis.Single stage pump - When in a casing only one impeller is revolving then it is called single stage pump.Double/ Multi stage pump - When in a casing two or more than two empeller is revolving than it is called double/multi stage pump.In biology, many different types of chemical and bio-mechanical pumps have evolved, and biomimicry is sometimesused in developing new types of mechanical pumps.

1.1 Types

Mechanical pumps may be submerged in the fluid they are pumping or be placed external to the fluid.Pumps can be classified by their method of displacement into positive displacement pumps, impulse pumps, velocitypumps, gravity pumps, steam pumps and valveless pumps. There are two basic types of pumps: positive displacementand centrifugal. Although axial-flow pumps are frequently classified as a separate type, they have essentially the sameoperating principles as centrifugal pumps.[2]

1.1.1 Positive displacement pump

A positive displacement pump makes a fluid move by trapping a fixed amount and forcing (displacing) that trappedvolume into the discharge pipe.Some positive displacement pumps use an expanding cavity on the suction side and a decreasing cavity on the dischargeside. Liquid flows into the pump as the cavity on the suction side expands and the liquid flows out of the discharge asthe cavity collapses. The volume is constant through each cycle of operation.

1

2 CHAPTER 1. PUMP

A small, electrically powered pump

Positive displacement pump behavior and safety

Positive displacement pumps, unlike centrifugal or roto-dynamic pumps, theoretically can produce the same flow ata given speed (RPM) no matter what the discharge pressure. Thus, positive displacement pumps are constant flowmachines. However, a slight increase in internal leakage as the pressure increases prevents a truly constant flow rate.A positive displacement pump must not operate against a closed valve on the discharge side of the pump, because ithas no shutoff head like centrifugal pumps. A positive displacement pump operating against a closed discharge valvecontinues to produce flow and the pressure in the discharge line increases until the line bursts, the pump is severelydamaged, or both.A relief or safety valve on the discharge side of the positive displacement pump is therefore necessary. The reliefvalve can be internal or external. The pump manufacturer normally has the option to supply internal relief or safetyvalves. The internal valve is usually only used as a safety precaution. An external relief valve in the discharge line,with a return line back to the suction line or supply tank provides increased safety.

1.1. TYPES 3

A large, electrically driven pump (electropump) for waterworks near the Hengsteysee, Germany

Horizontally mounted lobe pump (right) shown with its electric motor (left) and drive-shaft bearing (middle)

Positive displacement types

A positive displacement pump can be further classified according to the mechanism used to move the fluid:

• Rotary-type positive displacement: internal gear, screw, shuttle block, flexible vane or sliding vane, circum-

4 CHAPTER 1. PUMP

Discharge

Suction

Vane

Lobe pump internals

ferential piston, flexible impeller, helical twisted roots (e.g. the Wendelkolben pump) or liquid ring vacuumpumps

• Reciprocating-type positive displacement: piston or diaphragm pumps

• Linear-type positive displacement: rope pumps and chain pumps

Rotary positive displacement pumps These pumps move fluid using a rotating mechanism that creates a vacuumthat captures and draws in the liquid.Advantages: Rotary pumps are very efficient because they naturally remove air from the lines, eliminating the needto bleed the air from the lines manually.Drawbacks: The nature of the pump requires very close clearances between the rotating pump and the outer edge,making it rotate at a slow, steady speed. If rotary pumps are operated at high speeds, the fluids cause erosion, whicheventually causes enlarged clearances that liquid can pass through, which reduces efficiency.Rotary positive displacement pumps fall into three main types:

• Gear pumps - a simple type of rotary pump where the liquid is pushed between two gears

• Screw pumps - the shape of the internals of this pump is usually two screws turning against each other to pumpthe liquid

• Rotary vane pumps - similar to scroll compressors, these have a cylindrical rotor encased in a similarly shapedhousing. As the rotor orbits, the vanes trap fluid between the rotor and the casing, drawing the fluid throughthe pump.

Reciprocating positive displacement pumps Main article: Reciprocating pump

1.1. TYPES 5

Rotary vane pump

Reciprocating pumps move the fluid using one or more oscillating pistons, plungers, or membranes (diaphragms),while valves restrict fluid motion to the desired direction.Pumps in this category range from simplex, with one cylinder, to in some cases quad (four) cylinders, or more. Manyreciprocating-type pumps are duplex (two) or triplex (three) cylinder. They can be either single-acting with suctionduring one direction of piston motion and discharge on the other, or double-acting with suction and discharge in bothdirections. The pumps can be powered manually, by air or steam, or by a belt driven by an engine. This type of pumpwas used extensively in the 19th century—in the early days of steam propulsion—as boiler feed water pumps. Nowreciprocating pumps typically pump highly viscous fluids like concrete and heavy oils, and serve in special applicationsthat demand low flow rates against high resistance. Reciprocating hand pumps were widely used to pump water fromwells. Common bicycle pumps and foot pumps for inflation use reciprocating action.These positive displacement pumps have an expanding cavity on the suction side and a decreasing cavity on thedischarge side. Liquid flows into the pumps as the cavity on the suction side expands and the liquid flows out of thedischarge as the cavity collapses. The volume is constant given each cycle of operation.Typical reciprocating pumps are:

• Plunger pumps - a reciprocating plunger pushes the fluid through one or two open valves, closed by suction onthe way back.

• Diaphragm pumps - similar to plunger pumps, where the plunger pressurizes hydraulic oil which is used to flexa diaphragm in the pumping cylinder. Diaphragm valves are used to pump hazardous and toxic fluids.

• Piston pumps displacement pumps - usually simple devices for pumping small amounts of liquid or gel manually.The common hand soap dispenser is such a pump.

• Radial piston pumps

Various positive displacement pumps The positive displacement principle applies in these pumps:

6 CHAPTER 1. PUMP

• Rotary lobe pump

• Progressive cavity pump

• Rotary gear pump

• Piston pump

• Diaphragm pump

• Screw pump

• Gear pump

• Hydraulic pump

• Rotary vane pump

• Peristaltic pump

• Rope pump

• Flexible impeller pump

Gear pump Main article: Gear pump

This is the simplest of rotary positive displacement pumps. It consists of two meshed gears that rotate in a closelyfitted casing. The tooth spaces trap fluid and force it around the outer periphery. The fluid does not travel back onthe meshed part, because the teeth mesh closely in the center. Gear pumps see wide use in car engine oil pumps andin various hydraulic power packs.

Screw pump Main article: Screw pump

A screw pump is a more complicated type of rotary pump that uses two or three screws with opposing thread —e.g., one screw turns clockwise and the other counterclockwise. The screws are mounted on parallel shafts that havegears that mesh so the shafts turn together and everything stays in place. The screws turn on the shafts and drive fluidthrough the pump. As with other forms of rotary pumps, the clearance between moving parts and the pump’s casingis minimal.

Progressing cavity pump Main article: Progressive cavity pump

Widely used for pumping difficult materials, such as sewage sludge contaminated with large particles, this pumpconsists of a helical rotor, about ten times as long as its width. This can be visualized as a central core of diameter xwith, typically, a curved spiral wound around of thickness half x, though in reality it is manufactured in single casting.This shaft fits inside a heavy duty rubber sleeve, of wall thickness also typically x. As the shaft rotates, the rotorgradually forces fluid up the rubber sleeve. Such pumps can develop very high pressure at low volumes.

Roots-type pumps Main article: Roots-type supercharger

Named after the Roots brothers who invented it, this lobe pump displaces the liquid trapped between two longhelical rotors, each fitted into the other when perpendicular at 90°, rotating inside a triangular shaped sealing lineconfiguration, both at the point of suction and at the point of discharge. This design produces a continuous flow withequal volume and no vortex. It can work at low pulsation rates, and offers gentle performance that some applicationsrequire.Applications include:

• High capacity industrial air compressors

1.1. TYPES 7

• Roots superchargers on internal combustion engines.

• A brand of civil defense siren, the Federal Signal Corporation's Thunderbolt.

Peristaltic pump Main article: Peristaltic pump

A peristaltic pump is a type of positive displacement pump. It contains fluid within a flexible tube fitted inside a circularpump casing (though linear peristaltic pumps have been made). A number of rollers, shoes, or wipers attached to arotor compresses the flexible tube. As the rotor turns, the part of the tube under compression closes (or occludes),forcing the fluid through the tube. Additionally, when the tube opens to its natural state after the passing of the camit draws (restitution) fluid into the pump. This process is called peristalsis and is used in many biological systems suchas the gastrointestinal tract.

Plunger pumps Main article: Plunger pump

Plunger pumps are reciprocating positive displacement pumps.These consist of a cylinder with a reciprocating plunger. The suction and discharge valves are mounted in the headof the cylinder. In the suction stroke the plunger retracts and the suction valves open causing suction of fluid intothe cylinder. In the forward stroke the plunger pushes the liquid out of the discharge valve. Efficiency and commonproblems: With only one cylinder in plunger pumps, the fluid flow varies between maximum flow when the plungermoves through the middle positions, and zero flow when the plunger is at the end positions. A lot of energy is wastedwhen the fluid is accelerated in the piping system. Vibration and water hammermay be a serious problem. In generalthe problems are compensated for by using two or more cylinders not working in phase with each other.

Triplex-style plunger pumps Triplex plunger pumps use three plungers, which reduces the pulsation of singlereciprocating plunger pumps. Adding a pulsation dampener on the pump outlet can further smooth the pump ripple,or ripple graph of a pump transducer. The dynamic relationship of the high-pressure fluid and plunger generallyrequires high-quality plunger seals. Plunger pumps with a larger number of plungers have the benefit of increasedflow, or smoother flow without a pulsation dampener. The increase in moving parts and crankshaft load is onedrawback.Car washes often use these triplex-style plunger pumps (perhaps without pulsation dampeners). In 1968, WilliamBruggeman significantly reduced the size of the triplex pump and increased the lifespan so that car washes could useequipment with smaller footprints. Durable high pressure seals, low pressure seals and oil seals, hardened crankshafts,hardened connecting rods, thick ceramic plungers and heavier duty ball and roller bearings improve reliability intriplex pumps. Triplex pumps now are in a myriad of markets across the world.Triplex pumps with shorter lifetimes are commonplace to the home user. A person who uses a home pressure washerfor 10 hours a year may be satisfied with a pump that lasts 100 hours between rebuilds. Industrial-grade or continuousduty triplex pumps on the other end of the quality spectrum may run for as much as 2,080 hours a year.The oil and gas drilling industry uses massive semi trailer-transported triplex pumps called mud pumps to pumpdrilling mud, which cools the drill bit and carries the cuttings back to the surface.[3] Drillers use triplex or evenquintuplex pumps to inject water and solvents deep into shale in the extraction process called fracking.[4]

Compressed-air-powered double-diaphragmpumps Onemodern application of positive displacement diaphragmpumps is compressed-air-powered double-diaphragm pumps. Run on compressed air these pumps are intrinsicallysafe by design, although all manufacturers offer ATEX certified models to comply with industry regulation. Thesepumps are relatively inexpensive and can perform a wide variety of duties, from pumping water out of bunds, topumping hydrochloric acid from secure storage (dependent on how the pump is manufactured – elastomers / bodyconstruction). Lift is normally limited to roughly 6m although heads can reach almost 200 psi (1.4 MPa).

Rope pumps Main article: Rope pump

Devised in China as chain pumps over 1000 years ago, these pumps can be made from very simple materials: A rope,a wheel and a PVC pipe are sufficient to make a simple rope pump. For this reason they have become extremely

8 CHAPTER 1. PUMP

popular around the world since the 1980s. Rope pump efficiency has been studied by grass roots organizations andthe techniques for making and running them have been continuously improved.[5]

1.1.2 Impulse pumps

Impulse pumps use pressure created by gas (usually air). In some impulse pumps the gas trapped in the liquid(usually water), is released and accumulated somewhere in the pump, creating a pressure that can push part of theliquid upwards.Conventional impulse pumps include:

• Hydraulic ram pumps – kinetic energy of a low-head water supply is stored temporarily in an air-bubblehydraulic accumulator, then used to drive water to a higher head.

• Pulser pumps – run with natural resources, by kinetic energy only.

• Airlift pumps – run on air inserted into pipe, which pushes the water up when bubbles move upward

Instead of a gas accumulation and releasing cycle, the pressure can be created by burning of hydrocarbons. Suchcombustion driven pumps directly transmit the impulse form a combustion event through the actuation membrane tothe pump fluid. In order to allow this direct transmission, the pump needs to be almost entirely made of an elastomer(e.g. silicone rubber). Hence, the combustion causes the membrane to expand and thereby pumps the fluid out of theadjacent pumping chamber. The first combustion-driven soft pump was developed by ETH Zurich.[6]

Hydraulic ram pumps

A hydraulic ram is a water pump powered by hydropower.It takes in water at relatively low pressure and high flow-rate and outputs water at a higher hydraulic-head and lowerflow-rate. The device uses the water hammer effect to develop pressure that lifts a portion of the input water thatpowers the pump to a point higher than where the water started.The hydraulic ram is sometimes used in remote areas, where there is both a source of low-head hydropower, and aneed for pumping water to a destination higher in elevation than the source. In this situation, the ram is often useful,since it requires no outside source of power other than the kinetic energy of flowing water.

1.1.3 Velocity pumps

Rotodynamic pumps (or dynamic pumps) are a type of velocity pump in which kinetic energy is added to the fluidby increasing the flow velocity. This increase in energy is converted to a gain in potential energy (pressure) when thevelocity is reduced prior to or as the flow exits the pump into the discharge pipe. This conversion of kinetic energyto pressure is explained by the First law of thermodynamics, or more specifically by Bernoulli’s principle.Dynamic pumps can be further subdivided according to the means in which the velocity gain is achieved.[7]

These types of pumps have a number of characteristics:

1. Continuous energy

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

3. Conversion of increased velocity (kinetic energy) to an increase in pressure head

A practical difference between dynamic and positive displacement pumps is how they operate under closed valveconditions. Positive displacement pumps physically displace fluid, so closing a valve downstream of a positive dis-placement pump produces a continual pressure build up that can cause mechanical failure of pipeline or pump.Dynamic pumps differ in that they can be safely operated under closed valve conditions (for short periods of time).

1.1. TYPES 9

Radial-flow pumps

These are also referred to as centripetal design pumps. The fluid enters along the axis or center, is accelerated by theimpeller and exits at right angles to the shaft(radially). Radial-flow pumps operate at higher pressures and lower flowrates than axial- and mixed-flow pumps.

Axial-flow pumps

Main article: Axial-flow pump

These are also referred to as All fluid pumps The fluid is pushed outward or inward and move fluid axially. Theyoperate at much lower pressures and higher flow rates than radial-flow (centripetal) pumps.

Mixed-flow pumps

Mixed-flow pumps function as a compromise between radial and axial-flow pumps. The fluid experiences both radialacceleration and lift and exits the impeller somewhere between 0 and 90 degrees from the axial direction. As aconsequence mixed-flow pumps operate at higher pressures than axial-flow pumps while delivering higher dischargesthan radial-flow pumps. The exit angle of the flow dictates the pressure head-discharge characteristic in relation toradial and mixed-flow.

Eductor-jet pump

Main article: Eductor-jet pump

This uses a jet, often of steam, to create a low pressure. This low pressure sucks in fluid and propels it into a higherpressure region.

1.1.4 Gravity pumps

Gravity pumps include the syphon and Heron’s fountain. The hydraulic ram is also sometimes called a gravity pump;in a gravity pump the water is lifted by gravitational force.

1.1.5 Steam pumps

Steam pumps have been for a long time mainly of historical interest. They include any type of pump powered by asteam engine and also pistonless pumps such as Thomas Savery's or the Pulsometer steam pump.Recently there has been a resurgence of interest in low power solar steam pumps for use in smallholder irrigationin developing countries. Previously small steam engines have not been viable because of escalating inefficiencies asvapour engines decrease in size. However the use of modern engineering materials coupled with alternative engineconfigurations has meant that these types of system are now a cost effective opportunity.

1.1.6 Valveless pumps

Valveless pumping assists in fluid transport in various biomedical and engineering systems. In a valveless pumpingsystem, no valves (or physical occlusions) are present to regulate the flow direction. The fluid pumping efficiency ofa valveless system, however, is not necessarily lower than that having valves. In fact, many fluid-dynamical systemsin nature and engineering more or less rely upon valveless pumping to transport the working fluids therein. Forinstance, blood circulation in the cardiovascular system is maintained to some extent even when the heart’s valvesfail. Meanwhile, the embryonic vertebrate heart begins pumping blood long before the development of discerniblechambers and valves. In microfluidics, valveless impedance pumps have been fabricated, and are expected to beparticularly suitable for handling sensitive biofluids. Ink jet printers operating on the Piezoelectric transducer principle

10 CHAPTER 1. PUMP

also use valveless pumping. The pump chamber is emptied through the printing jet due to reduced flow impedancein that direction and refilled by capillary action..

1.2 Pump repairs

Examining pump repair records and mean time between failures (MTBF) is of great importance to responsible andconscientious pump users. In view of that fact, the preface to the 2006 Pump User’s Handbook alludes to “pumpfailure” statistics. For the sake of convenience, these failure statistics often are translated into MTBF (in this case,installed life before failure).[8]

In early 2005, Gordon Buck, John Crane Inc.’s chief engineer for Field Operations in Baton Rouge, LA, examinedthe repair records for a number of refinery and chemical plants to obtain meaningful reliability data for centrifugalpumps. A total of 15 operating plants having nearly 15,000 pumps were included in the survey. The smallest ofthese plants had about 100 pumps; several plants had over 2000. All facilities were located in the United States. Inaddition, considered as “new”, others as “renewed” and still others as “established”. Many of these plants—but notall—had an alliance arrangement with John Crane. In some cases, the alliance contract included having a John CraneInc. technician or engineer on-site to coordinate various aspects of the program.Not all plants are refineries, however, and different results occur elsewhere. In chemical plants, pumps have tra-ditionally been “throw-away” items as chemical attack limits life. Things have improved in recent years, but thesomewhat restricted space available in “old” DIN and ASME-standardized stuffing boxes places limits on the typeof seal that fits. Unless the pump user upgrades the seal chamber, the pump only accommodates more compact andsimple versions. Without this upgrading, lifetimes in chemical installations are generally around 50 to 60 percent ofthe refinery values.Unscheduled maintenance is often one of the most significant costs of ownership, and failures of mechanical seals andbearings are among the major causes. Keep in mind the potential value of selecting pumps that cost more initially,but last much longer between repairs. The MTBF of a better pump may be one to four years longer than that of itsnon-upgraded counterpart. Consider that published average values of avoided pump failures range from US$2600to US$12,000. This does not include lost opportunity costs. One pump fire occurs per 1000 failures. Having fewerpump failures means having fewer destructive pump fires.As has been noted, a typical pump failure based on actual year 2002 reports, costs US$5,000 on average. Thisincludes costs for material, parts, labor and overhead. Extending a pump’s MTBF from 12 to 18 months would saveUS$1,667 per year — which might be greater than the cost to upgrade the centrifugal pump’s reliability.[8][9][10]

1.3 Applications

Pumps are used throughout society for a variety of purposes. Early applications includes the use of the windmillor watermill to pump water. Today, the pump is used for irrigation, water supply, gasoline supply, air conditioningsystems, refrigeration (usually called a compressor), chemical movement, sewage movement, flood control, marineservices, 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.

1.3.1 Priming a pump

Typically, a liquid pump can't simply draw air. The feed line of the pump and the internal body surrounding thepumping mechanism must first be filled with the liquid that requires pumping: An operator must introduce liquidinto the system to initiate the pumping. This is called priming the pump. Loss of prime is usually due to ingestionof air into the pump. The clearances and displacement ratios in pumps for liquids, whether thin or more viscous,usually cannot displace air due to its compressibility. This is the case with most velocity (rotodynamic) pumps — forexample, centrifugal pumps.Positive–displacement pumps, however, tend to have sufficiently tight sealing between the moving parts and the casingor housing of the pump that they can be described as self-priming. Such pumps can also serve as priming pumps, socalled when they are used to fulfill that need for other pumps in lieu of action taken by a human operator.

1.3. APPLICATIONS 11

1.3.2 Pumps as public water supplies

One sort of pump once common worldwide was a hand-powered water pump, or 'pitcher pump'. It was commonlyinstalled over community water wells in the days before piped water supplies.In parts of the British Isles, it was often called the parish pump. Though such community pumps are no longercommon, people still used the expression parish pump to describe a place or forum where matters of local interestare discussed.[12]

Because water from pitcher pumps is drawn directly from the soil, it is more prone to contamination. If such water isnot filtered and purified, consumption of it might lead to gastrointestinal or other water-borne diseases. A notoriouscase is the 1854 Broad Street cholera outbreak. At the time it was not known how cholera was transmitted, butphysician John Snow suspected contaminated water and had the handle of the public pump he suspected removed;the outbreak then subsided.Modern hand-operated community pumps are considered themost sustainable low-cost option for safe water supply inresource-poor settings, often in rural areas in developing countries. A hand pump opens access to deeper groundwaterthat is often not polluted and also improves the safety of a well by protecting the water source from contaminatedbuckets. Pumps such as the Afridev pump are designed to be cheap to build and install, and easy to maintain withsimple parts. However, scarcity of spare parts for these type of pumps in some regions of Africa has diminished theirutility for these areas.

1.3.3 Sealing multiphase pumping applications

Multiphase pumping applications, also referred to as tri-phase, have grown due to increased oil drilling activity. Inaddition, the economics of multiphase production is attractive to upstream operations as it leads to simpler, smallerin-field installations, reduced equipment costs and improved production rates. In essence, the multiphase pump canaccommodate all fluid stream properties with one piece of equipment, which has a smaller footprint. Often, twosmaller multiphase pumps are installed in series rather than having just one massive pump.For midstream and upstream operations, multiphase pumps can be located onshore or offshore and can be connectedto single or multiple wellheads. Basically, multiphase pumps are used to transport the untreated flow stream pro-duced from oil wells to downstream processes or gathering facilities. This means that the pump may handle a flowstream (well stream) from 100 percent gas to 100 percent liquid and every imaginable combination in between.The flow stream can also contain abrasives such as sand and dirt. Multiphase pumps are designed to operate underchanging/fluctuating process conditions. Multiphase pumping also helps eliminate emissions of greenhouse gases asoperators strive to minimize the flaring of gas and the venting of tanks where possible.[13]

Types and features of multiphase pumps

Helico-Axial Pumps (Centrifugal) A rotodynamic pump with one single shaft that requires two mechanical seals, thispump uses an open-type axial impeller. It’s often called a Poseidon pump, and can be described as a cross betweenan axial compressor and a centrifugal pump.Twin Screw (Positive Displacement) The twin screw pump is constructed of two inter-meshing screws that move thepumped fluid. Twin screw pumps are often used when pumping conditions contain high gas volume fractions andfluctuating inlet conditions. Four mechanical seals are required to seal the two shafts.Progressive Cavity Pumps (Positive Displacement) Progressive cavity pumps are single-screw types typically used inshallow wells or at the surface. This pump is mainly used on surface applications where the pumped fluid may containa considerable amount of solids such as sand and dirt.Electric Submersible Pumps (Centrifugal) These pumps are basically multistage centrifugal pumps and are widely usedin oil well applications as a method for artificial lift. These pumps are usually specified when the pumped fluid ismainly liquid.Buffer Tank A buffer tank is often installed upstream of the pump suction nozzle in case of a slug flow. The buffertank breaks the energy of the liquid slug, smooths any fluctuations in the incoming flow and acts as a sand trap.As the name indicates, multiphase pumps and their mechanical seals can encounter a large variation in service con-ditions such as changing process fluid composition, temperature variations, high and low operating pressures andexposure to abrasive/erosive media. The challenge is selecting the appropriate mechanical seal arrangement and

12 CHAPTER 1. PUMP

support system to ensure maximized seal life and its overall effectiveness.[13][14][15]

1.4 Specifications

Pumps are commonly rated by horsepower, flow rate, outlet pressure in metres (or feet) of head, inlet suction insuction feet (or metres) of head. The head can be simplified as the number of feet or metres the pump can raise orlower a column of water at atmospheric pressure.From an initial design point of view, engineers often use a quantity termed the specific speed to identify the mostsuitable pump type for a particular combination of flow rate and head.

1.5 Pumping power

Main article: Bernoulli’s equation

The power imparted into a fluid increases the energy of the fluid per unit volume. Thus the power relationship isbetween the conversion of the mechanical energy of the pump mechanism and the fluid elements within the pump.In general, this is governed by a series of simultaneous differential equations, known as the Navier–Stokes equations.However a more simple equation relating only the different energies in the fluid, known as Bernoulli’s equation canbe used. Hence the power, P, required by the pump:

P =∆pQ

η

where Δp is the change in total pressure between the inlet and outlet (in Pa), and Q, the volume flow-rate of thefluid is given in m3/s. The total pressure may have gravitational, static pressure and kinetic energy components; i.e.energy is distributed between change in the fluid’s gravitational potential energy (going up or down hill), change invelocity, or change in static pressure. η is the pump efficiency, and may be given by the manufacturer’s information,such as in the form of a pump curve, and is typically derived from either fluid dynamics simulation (i.e. solutions tothe Navier–Stokes for the particular pump geometry), or by testing. The efficiency of the pump depends upon thepump’s configuration and operating conditions (such as rotational speed, fluid density and viscosity etc.)

∆P =(v22 − v21)

2+ ∆zg +

∆pstaticρ

For a typical “pumping” configuration, the work is imparted on the fluid, and is thus positive. For the fluid impartingthe work on the pump (i.e. a turbine), the work is negative. Power required to drive the pump is determined bydividing the output power by the pump efficiency. Furthermore, this definition encompasses pumps with no movingparts, such as a siphon.

1.6 Pump efficiency

Pump efficiency is defined as the ratio of the power imparted on the fluid by the pump in relation to the power suppliedto drive the pump. Its value is not fixed for a given pump, efficiency is a function of the discharge and therefore alsooperating head. For centrifugal pumps, the efficiency tends to increase with flow rate up to a point midway throughthe operating range (peak efficiency) and then declines as flow rates rise further. Pump performance data such as thisis usually supplied by the manufacturer before pump selection. Pump efficiencies tend to decline over time due towear (e.g. increasing clearances as impellers reduce in size).When a system design includes a centrifugal pump, an important issue it its design is matching the head loss-flowcharacteristic with the pump so that it operates at or close to the point of its maximum efficiency.Pump efficiency is an important aspect and pumps should be regularly tested. Thermodynamic pump testing is onemethod.

1.7. SEE ALSO 13

1.7 See also

• Affinity laws

• Balancing machine

• Beam pump and walking beam pump

• Bellows - a simple air pumping device

• Breast pump

• Bush Pump

• Chopper pump

• Concrete pump

• Comparison of pumps

• Cyclic pump

• Drum pump

• Fire pump

• Gas compressor

• Gerotor

• Honda pumps

• Inductive Pump

• Intelligent pump

• Jockey pump

• Metering pump

• Peristaltic pump

• Pumping station

• Pumpjack (oil pump)

• Scoop wheel

• Scroll pump, most used in scroll compressors

• Secondary air injection

• Sine pump

• Tesla turbine

• Wind pump

• Slip factor

• Biological pump - a phenomenon in nature studied in ecology and meteorology

• Ion transporter - bio-chemical pump used in living cell membranes to transfer ions

• Pump organ - musical instrument using bellows

• Priming system - remove air from pipe line

14 CHAPTER 1. PUMP

1.8 References[1] Pump classifications. Fao.org. Retrieved on 2011-05-25.

[2] Improving Pumping System Performance: A Sourcebook for Industry, Second Edition, May 2006. Accessed 2015-05-22.

[3] “Drilling Pumps”. Gardner Denver.

[4] “Stimulation and Fracturing pumps: Reciprocating, Quintuplex Stimulation and Fracturing Pump”. Gardner Denver.

[5] Tanzania water blog - example of grass roots researcher telling about his study and work with the rope pump in Africa.

[6] C.M. Schumacher, M. Loepfe, R.Fuhrer, R.N. Grass, andW.J. Stark, “3D printed lost-wax casted soft silicone monoblocksenable heart-inspired pumping by internal combustion,” RSC Advances, Vol. 4,pp. 16039-16042, 2014.

[7] Welcome to the Hydraulic Institute. Pumps.org. Retrieved on 2011-05-25.

[8] Pump Statistics Should Shape Strategies. Mt-online.com 1 October 2008. Retrieved 24 September 2014.

[9] Submersible slurry pumps in high demand. Engineeringnews.co.za. Retrieved on 2011-05-25.

[10] Wasser, Goodenberger, Jim and Bob (November 1993). “Extended Life, Zero Emissions Seal for Process Pumps”. JohnCrane Technical Report (Routledge). TRP 28017.

[11] Hill, Donald Routledge (1996). A History of Engineering in Classical and Medieval Times. London: Routledge. p. 143.ISBN 0-415-15291-7.

[12] “Online Dictionary – Parish Pump”. Retrieved 2010-11-22.

[13] Sealing Multiphase Pumping Applications | Seals. Pump-zone.com. Retrieved on 2011-05-25.

[14] John Crane Seal Sentinel – John Crane Increases Production Capabilities with Machine that Streamlines Four MachiningFunctions into One. Sealsentinel.com. Retrieved on 2011-05-25.

[15] Vacuum pump new on SA market. Engineeringnews.co.za. Retrieved on 2011-05-25.

1.9 Further reading• Australian Pump Manufacturers’ Association. Australian Pump Technical Handbook, 3rd edition. Canberra:Australian Pump Manufacturers’ Association, 1987. ISBN 0-7316-7043-4.

• Hicks, Tyler G. and TheodoreW. Edwards. PumpApplication Engineering. McGraw-Hill BookCompany.1971.ISBN 0-07-028741-4

• Karassik, Igor, ed. (2007). Pump Handbook (4 ed.). McGraw Hill. ISBN 9780071460446.

• Robbins, L. B. “Homemade Water Pressure Systems”. Popular Science, February 1919, pages 83–84. Articleabout how a homeowner can easily build a pressurized home water system that does not use electricity.

1.10 External links• ASME B73 Standards Committee, Chemical Standard Pumps

• Water hammer pump

• www.pumpschool.com—Pump education devoted primarily to rotary positive displacement pumps

• — See Jet Pumps

• bravo pumps australia

1.10. EXTERNAL LINKS 15

Simple hand pump

16 CHAPTER 1. PUMP

Old hand water pump (c. 1924) at the Colored School in Alapaha, Georgia, US

1.10. EXTERNAL LINKS 17

Gear pump

18 CHAPTER 1. PUMP

Screw pump

1.10. EXTERNAL LINKS 19

Cavity pump

A Roots lobe pump

20 CHAPTER 1. PUMP

360° Peristaltic Pump

1.10. EXTERNAL LINKS 21

Rope pump schematic

22 CHAPTER 1. PUMP

A centrifugal pump uses an impeller with backward-swept arms

1.10. EXTERNAL LINKS 23

derelict windmill connected to water pump with water storage tank in the foreground

Metering pump for gasoline and additives.

24 CHAPTER 1. PUMP

First European depiction of a piston pump, by Taccola, c.1450.[11]

1.10. EXTERNAL LINKS 25

Irrigation is underway by pump-enabled extraction directly from the Gumti, seen in the background, in Comilla, Bangladesh.

Chapter 2

Dosing

Dosing generally applies to feeding chemicals or medicines in small quantities into a process fluid or to a living beingat intervals or to atmosphere at intervals to give sufficient time for the chemical or medicine to react or show theresults.In the case of human beings or animals the word dose is generally used but in the case of inanimate objects theword dosing is used. The term dose titration, referring to stepwise titration of doses until a desired level of effect isreached, is common in medicine.

2.1 In engineering

The word dosing is very commonly used by engineers in thermal power stations, in water treatment, in any industrywhere steam is being generated, and in building services for heating and cooling water treatment. Dosing proceduresare also in vogue in textile and similar industries where chemical treatment is involved.Commercial swimming pools also require chemical dosing in order to control pH balance, chlorine level, and othersuch water quality criteria. Modern swimming pool plant will have bulk storage of chemicals held in separate dosingtanks, and will have automated controls and dosing pumps to top up the various chemicals as required to controlthe water quality.In a power station treatment chemicals are injected or fed to boiler and also to feed and make up water under pressure,but in small dosages or rate of injection. The feeding at all places is done by means of small capacity dosing pumpsspecially designed for the duty demanded.In building services the water quality of various pumped fluid systems, including for heating, cooling, and condensatewater, will be regularly checked and topped up with chemicals manually as required to suit the required water quality.Most commonly inhibitors will be added to protect the pipework and components against corrosion, or a biocide willbe added to stop the growth of bacteria in lower temperature systems. The required chemicals will be added to thefluid system by use of a dosing pot; a multi-valved chamber in which the chemical can be added, and then introducedto the fluid system in a controlled manner.

2.2 In agriculture

The feeding of chemicals in agriculture has also become common due to technology developments. However agri-cultural dosing is done by means of hand held pressure spray pumps

2.3 Aerial spraying

Sometimes aerial spraying of chemicals by fixed quantities at intervals or dosing is also adopted for agriculturalspraying or for atmospheric spraying for eliminating certain types of harmful insects.

26

Chapter 3

Reciprocating pump

A reciprocating pump is a class of positive-displacement pumps which includes the piston pump, plunger pumpand diaphragm pump. It is often used where a relatively small quantity of liquid is to be handled and where deliverypressure is quite large. In reciprocating pumps, the chamber in which the liquid is trapped, is a stationary cylinderthat contains the piston or plunger.

3.1 Types

Reciprocating pumps may be of the following types

• Simple hand-operated reciprocating pump

• Power operated deep well reciprocating pump

• Single-acting reciprocating pump

• Double-acting reciprocating pump

• triple -acting reciprocating pump

3.2 Examples

Some examples of reciprocating pumps include

• Windmill water and oil pump

• Hand pump

• Axial piston pump

• Radial piston pump

3.3 See also

Pump

3.4 References• Pump Handbook third edition (EDITED BY Igor J. Karassik Joseph P. Messina Paul Cooper Charles C.Healdeald)

27

28 CHAPTER 3. RECIPROCATING PUMP

Reciprocating pump attached to a Windmill on a farm.

3.4. REFERENCES 29

• Maritime.org

• Roymech.co.uk

30 CHAPTER 3. RECIPROCATING PUMP

3.5 Text and image sources, contributors, and licenses

3.5.1 Text• Pump Source: https://en.wikipedia.org/wiki/Pump?oldid=700907130 Contributors: Lee Daniel Crocker, Bryan Derksen, Ellmist, Dr-Bob, Heron, Topory, Patrick, Zanimum, Dcljr, IZAK, Ahoerstemeier, Mac, Theresa knott, Snoyes, Kingturtle, Ugen64, Glenn, Jschwa1,Samw, SEWilco, Phoebe, Robbot, Jra, HaeB, Xanzzibar, Buster2058, AnchetaWis, Giftlite, DocWatson42, DavidCary, Mintleaf~enwiki,Wolfkeeper, BenFrantzDale, Everyking, Pashute, Per Honor et Gloria, Solipsist, Antandrus, H Padleckas, Sam Hocevar, Ukexpat, Spiffysperry, Diagonalfish, Discospinster, Brianhe, Yuval madar, Marsian~enwiki, Vsmith, LindsayH, Notinasnaid, Inventor, Nabla, El C,Mwanner, RoyBoy, Femto, Longhair, CrimsonFury, Giraffedata, Alansohn, Anthony Appleyard, Tobych, Atlant, Andrewpmk, Wt-mitchell, Velella, Stephan Leeds, Gpvos, Drat, Shoefly, Mikeo, Ttownfeen, Tr00st, Adrian.benko, Postrach, Mindmatrix, Brhaspati,Thivierr, Plek, Pol098, Rtdrury, Tabletop, Kmg90, Schzmo, Cbdorsett, SCEhardt, SDC, Ryajinor, BD2412, MikeDockery, Josh Parris,Saperaud~enwiki, Rjwilmsi, Missmarple, Dennyboy34, Bubba73, Driglaz, Krash, JamesEG, Mariegriffiths, Allen Moore, FlaBot, Gurch,Chobot, John Dalton, Bgwhite, WriterHound, YurikBot, Wavelength, RussBot, DMahalko, Ytrottier, Stephenb, Ivdla, David R. Ingham,NawlinWiki, Spike Wilbury, Grafen, JohJak2, Rick lightburn, Seegoon, Ravedave, Dmoss, RL0919, Stevenwmccrary58, Syrthiss, Izuko,Kkmurray, Membender, User27091, TransUtopian, Calvin08, Emijrp, CQ, SilentC, Palx, Capz, Fang Aili, E Wing, Chriswaterguy,Skittle, Katieh5584, Amberrock, Mejor Los Indios, Groyolo, CIreland, ChemGardener, SmackBot, Selfworm, UbUb, David Kernow,Reedy, KnowledgeOfSelf, Jagged 85, KVDP, Gilliam, Ohnoitsjamie, Optikos, Jprg1966, Snori, SchfiftyThree, Colonies Chris, Can'tsleep, clown will eat me, MyNameIsVlad, Proofreader, Jacob Poon, Cui Bono, Rrburke, Dripp, Kcordina, Mistress Selina Kyle, Hgilbert,Pumpman, Gregzsidisin, Cosmix, Mion, Will Beback, Rory096, Harryboyles, Gobonobo, Jaganath, Rijkbenik, Gregorydavid, Aspirex,Aleenf1, 16@r, The real bicky, JHunterJ, Dicklyon, Geologyguy, Ahering@cogeco.ca, Laurence Salamey, Abog, ChaoticLlama, Tawker-bot2, Lbr123, ChrisCork, SkyWalker, CmdrObot, Van helsing, Chrike, Rmallins, Revolus, Cydebot, A876, Mato, Go229, Gogo Dodo,Studerby, Abqsteve, Prof. Frink, Thijs!bot, Discostu5, Tonyle, Dtgriscom, Marek69, A. Balet, John254, Davidhorman, RoboServien,JEBrown87544, EdJogg, AntiVandalBot, Saimhe, Luna Santin, Mvjs, Mrshaba, DarkAudit, Daniel Kellis, Chill doubt, MVONeill, GaiusMaius, JAnDbot, Husond, MER-C, PhilKnight, Magioladitis, BlueKfrog, Seyhanersoy, Jrssr5, Joerd, Engineman, Catgut, 454Casull,User A1, Gun Powder Ma, Drjem3, MartinBot, SmokeySteve, R'n'B, CommonsDelinker, Johnpacklambert, Umbreo, Pekaje, CDM2,J.delanoy, Xris0, Old ivan, Janus Shadowsong, Macomac, NewEnglandYankee, Bernard S. Jansen, Aatomic1, Tygrrr, Vanished user39948282, Bonadea, Inwind, Idioma-bot, Funandtrvl, Lights, VolkovBot, Designflavour~enwiki, Turaj21, Philip Trueman, TXiKiBoT,Zamphuor, MrBeck, Yegor Chernyshev, Ray Beebe, Jackfork, Bored461, BotKung, Sararaye, Constantinobel, Andy Dingley, Kilmer-san,Bluesincenew, MikeRiggs, Tougar, Finnaries, Fingat, Northfox, Michael Frind, Matthias.haas, Eloc Jcg, D. 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Abhyankar, FoolAmI, Riventree, Almuhammedi, Idyllic press, TawsifSalam, Jamesooders, Callme for a good time, Sm faysal, Pinethicket, GeVFR, Tjeenkwillink, Natty 34, Jschnur, Devisk, Twistlethrop, Emamnissar, Robvanvee,Orenburg1, Drain064, ChemE50, Jwolla, Tbhotch, Henfracar, Mean as custard, Alph Bot, Papacnktsp, EmausBot, Davejohnsan, Gru-pler, A556a, Pgdp123, RenamedUser01302013, Wikipelli, Мирослав Ћика, Gertdam, Thecheesykid, Midas02, Myusername99999,Leaderpro, AquaGeneral, Rajesh 2800, Kilopi, Amymaxwell139, Chatepandurang, Griffintok, Sobhuev, Accotink2, Maaseppo, Gray-Fullbuster, Spicemix, Smeatz, Morgis, ClueBot NG, Incompetence, Bugwak, Satellizer, Piast93, Chester Markel, Mavisding, Login-nigol, Millermk, Feedintm, Darkmag3, Widr, NeetuBarmecha21, 10elias10, Paulsimon294923874, Helpful Pixie Bot, Hollywooddu,Supermunkyfm94, Group03, Wbm1058, BG19bot, Ymblanter, WTBChris, MusikAnimal, Strangepower, WebSolutions4Me, PiusIm-pavidus, Altaïr, CitationCleanerBot, Probity incarnate, Pond101, Zedshort, Vanischenu, Darrenfiy, Ncastromarques, Mdann52, The Il-lusive Man, ChrisGualtieri, Helloworld98, Lucky0415, BrightStarSky, T567~enwiki, Rac2665, Holyhorseballs, Muik89, Jerry steriano,HFEO, Acetotyce, I am One of Many, Jodosma, Do better, Johnscotaus, Soebadri, Dmizell, InvincibleWiki, Mr RD, Ugog Nizdast, Jian-hui67, ரோஜா, SarathPetece, Grabalot, JaconaFrere, Rajeshrajraj, Gregpedia, TuxLibNit, Kpehlivanoglou, Primarily 1234, Chautrandvg,MatthewAtkinsonUK, Rajza112, Rohan.khariwale, Xxx-pussymuncher-xxx, Hinaqin, KasparBot, Sunny fml, Staffgage, SPPUMPING,Niroba567, Dkjyoti460 and Anonymous: 586

• Dosing Source: https://en.wikipedia.org/wiki/Dosing?oldid=647089670 Contributors: Alan Liefting, Mwanner, CDN99, Hooperbloob,Velella, RJFJR, Galaxiaad, Woohookitty, Kolbasz, Gurubrahma, SmackBot, SirLamer, Pflatau, Gil Gamesh, D V S, Mausy5043, Lar-toven, Mifter, Addbot, Quercus solaris, J04n, Erik9bot, FrescoBot, Pinethicket, Obankston, Pahazzard, HMSSolent, MrBill3, Cpfatts andAnonymous: 14

• Reciprocating pump Source: https://en.wikipedia.org/wiki/Reciprocating_pump?oldid=661365674 Contributors: The Anome, Gre-gorB, Malcolma, SmackBot, BenFranske, PhiLiP, Biscuittin, GILDog, Hanady, Wikiuser100, Addbot, Koppas, Pothumudi, DixonDBot,EleferenBot, Mattrude, ClueBot NG, BZTMPS, Ra.arch, PhoenixPub, Sharmasrb and Anonymous: 17

3.5.2 Images• File:Centrifugal_2.png Source: https://upload.wikimedia.org/wikipedia/commons/f/fe/Centrifugal_2.pngLicense: CC-BY-SA-3.0Con-tributors: Own work Original artist: R. Castelnuovo (myself)

• File:Commons-logo.svg Source: https://upload.wikimedia.org/wikipedia/en/4/4a/Commons-logo.svg License: CC-BY-SA-3.0Contrib-utors: ? Original artist: ?

• File:Crystal_Clear_action_run.png Source: https://upload.wikimedia.org/wikipedia/commons/5/5d/Crystal_Clear_action_run.pngLi-cense: LGPL Contributors: All Crystal Clear icons were posted by the author as LGPL on kde-look; Original artist: Everaldo Coelho andYellowIcon;

3.5. TEXT AND IMAGE SOURCES, CONTRIBUTORS, AND LICENSES 31

• File:Derelict_windpump_with_water_tank_in_the_foreground_next_to_the_Boorowa_railway_in_Galong_NSW_Australia.JPGSource: https://upload.wikimedia.org/wikipedia/commons/c/cd/Derelict_windpump_with_water_tank_in_the_foreground_next_to_the_Boorowa_railway_in_Galong_NSW_Australia.JPG License: CC BY-SA 4.0 Contributors: Own work Original artist: John Hewat fromCanberra, Australia

• File:Dosierpumpe.png Source: https://upload.wikimedia.org/wikipedia/commons/6/63/Dosierpumpe.png License: Public domain Con-tributors: www.thomas-magnete.com Original artist: THOMAS MAGNETE GmbH

• File:Drehkolbenpumpe.jpg Source: https://upload.wikimedia.org/wikipedia/commons/4/4d/Drehkolbenpumpe.jpg License: CC-BY-SA-3.0 Contributors: Herold & Co. GmbH Original artist: Herold & Co. GmbH

• File:Eccentric_pump.gif Source: https://upload.wikimedia.org/wikipedia/en/1/19/Eccentric_pump.gifLicense: PDContributors: ? Orig-inal artist: ?

• File:Gear_pump.png Source: https://upload.wikimedia.org/wikipedia/commons/c/c4/Gear_pump.png License: CC-BY-SA-3.0 Con-tributors: ? Original artist: ?

• File:Hand_pump.png Source: https://upload.wikimedia.org/wikipedia/commons/a/af/Hand_pump.png License: Public domain Con-tributors: ? Original artist: ?

• File:Jet_pump.jpg Source: https://upload.wikimedia.org/wikipedia/commons/5/5a/Jet_pump.jpg License: Public domain Contributors:Own work Original artist: KVDP

• File:Lobbenpomp.gif Source: https://upload.wikimedia.org/wikipedia/commons/d/df/Lobbenpomp.gif License: CC-BY-SA-3.0 Con-tributors: Transferred from nl.wikipedia to Commons. Original artist: McDavid at Dutch Wikipedia

• File:LobePump_en.svg Source: https://upload.wikimedia.org/wikipedia/commons/6/66/LobePump_en.svg License: CC0 Contributors:Own work Original artist: Jahobr

• File:Lysholm_screw_rotors.jpg Source: https://upload.wikimedia.org/wikipedia/commons/3/3a/Lysholm_screw_rotors.jpg License:CC BY-SA 2.5 Contributors: Own work Original artist: Motorhead at English Wikipedia

• File:Old_hand_water_pump.jpg Source: https://upload.wikimedia.org/wikipedia/commons/3/3c/Old_hand_water_pump.jpg License:CC BY-SA 4.0 Contributors: Own work Original artist: Bubba73 (Jud McCranie)

• File:Pcp-thumb.gif Source: https://upload.wikimedia.org/wikipedia/commons/c/c8/Pcp-thumb.gif License: Public domain Contribu-tors: Own work Original artist: Petteri Aimonen

• File:Pompe_à_palettes.gif Source: https://upload.wikimedia.org/wikipedia/commons/e/e1/Pompe_%C3%A0_palettes.gifLicense: CCBY-SA 1.0 Contributors: Transferred from fr.wikipedia to Commons by WikedKentaur using CommonsHelper. Original artist: The orig-inal uploader was Xlory at French Wikipedia

• File:Pump-enabled_Riverside_Irrigation_in_Comilla,_Bangladesh,_25_April_2014.jpg Source: https://upload.wikimedia.org/wikipedia/commons/8/88/Pump-enabled_Riverside_Irrigation_in_Comilla%2C_Bangladesh%2C_25_April_2014.jpgLicense: CCBY-SA3.0Con-tributors: Own work Original artist: Mohammed Tawsif Salam

• File:Question_book-new.svg Source: https://upload.wikimedia.org/wikipedia/en/9/99/Question_book-new.svg License: Cc-by-sa-3.0Contributors:Created from scratch in Adobe Illustrator. Based on Image:Question book.png created by User:Equazcion Original artist:Tkgd2007

• File:Rope_Pump.svg Source: https://upload.wikimedia.org/wikipedia/commons/e/ec/Rope_Pump.svg License: CC BY-SA 3.0 Con-tributors: Own work Original artist: Xofc

• File:Taccola_first_piston.jpg Source: https://upload.wikimedia.org/wikipedia/commons/e/e0/Taccola_first_piston.jpg License: Pub-lic domain Contributors: Reproduction [1] Original artist: Mariano di Jacopo

• File:Wasserwerk_pumpe01.jpg Source: https://upload.wikimedia.org/wikipedia/commons/8/83/Wasserwerk_pumpe01.jpg License:CC-BY-SA-3.0 Contributors: ? Original artist: ?

• File:Windmill_operated_water_pump.jpg Source: https://upload.wikimedia.org/wikipedia/commons/f/f0/Windmill_operated_water_pump.jpg License: GFDL Contributors: Own work Original artist: Ben Franske

3.5.3 Content license• Creative Commons Attribution-Share Alike 3.0