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Parallel operation

Parallel operation, or parallel pumping, of two centrifugal pumps is a mode which allows pump ...

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PE conductor

The PE ("Protective Earth") conductor is a protective, or earth, conductor.

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Pendulum-type electric motor

The pendulum-type electric motor of a machine (e.g. centrifugal pump) or the pendulum-type generator ...

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Performance coefficient

The performance coefficient (λ) is a characteristic coefficient identifying the pump input power. The ...

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Peripheral impeller

A peripheral impeller is a special impeller with a large number of small double-flow radial vanes ...

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Peripheral pump

Peripheral pump: Single-stage pump

Die Peripheralpumpe (siehe auch Seitenkanalpumpe) ist eine Kreiselpumpe, deren Laufrad (siehe ...

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Peristaltic pump

The peristaltic pump is a rotary positive displacement pump, in which the displacement element and ...

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Phase failure monitoring

A motor protection device should prevent individual phases from failing. Monitoring is carried out ...

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Phase voltage

Phase voltage is the voltage applied between one of the external conductors and the neutral conductor ...

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Photovoltaic pump system

Photovoltaic pump systems convert solar energy directly into electricity in order to drive pumps with ...

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pH value

The pH value, according to DIN 38 38404 (Part 5, 2009 edition), is the negative decimal logarithm of ...

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Pick-up

A pick-up is also referred to as a sensor.

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PI controller

The PI in "PI controller" stands for "Proportional Integral" and characterises a controller whose ...

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Piezoelectric sensor

The piezoelectric sensor is based on the piezoelectric effect and can be used to take pressure, ...

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Pipe friction loss

The pipe friction loss is the head loss resulting from the friction between the fluid handled and the ...

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Pipeline pump

Pipeline pump: single-stage, double-suction design with axially split casing

A pipeline pump serves to overcome height differences (see Geodetic altitude) and pipe friction ...

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Piping

Piping is used to transport fluids. The inside diameters of piping are classed according to the ...

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Piston pump / plunger pump

The most well-known positive displacement pumps are piston or plunger pumps with linear stroke. Their ...

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Piston transmitter

A piston transmitter is a glandless pressure transmitting device. For the protection of the ...

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Pitot tube

The pitot tube is a dynamic pressure sensor that is used to measure the total pressure exerted by fluids.

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Plain bearing

The plain bearing is an element frequently used in centrifugal pump construction that allows a moving ...

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Plastic pump

Plastic pumps are centrifugal pumps whose wetted components are made of plastic.  See Appendix Fig.

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Plastomer

A plastomer is a type of plastic that becomes flexible beyond a specific temperature, but which ...

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PLC

PLC stands for "Programmable Logic Controller" and refers to a computer-based control unit used for ...

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PM-Motor

The PM in "PM motor" stands for "permanent magnet" and refers to the fact that this motor is ...

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PN

ISO 7268 or EN 1333 defines PN as an alpha-numeric designation which is used for reference purposes ...

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Positive displacement pump

Positive displacement pump is a collective term for all pumps operating according to the positive ...

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Potential equalisation

Potential equalisation refers to the electrical connection that all but equalises conductive bodies (e.

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Potential flow

The term potential flow designates (apart from isolated singularities) a vortex-free and source-free ...

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Power

Power is the amount of work performed in a given time. In centrifugal pump technology, the concepts ...

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Power factor

The power factor or cos φ as applied to electrical engineering describes the relationship between ...

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Power input

The power input of a centrifugal pump (pump input power) is the mechanical power taken by the pump ...

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Power loss

Power loss (Pv) is the difference between the input and output power of a device, apparatus, pump ...

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Power measurement

Electrical power measurement is a method of measuring the power in a circuit, which is expressed in ...

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PRANDTL tube

The PRANDTL tube is a dynamic pressure sensor for measuring the local velocity in a flow and is used ...

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Pressure

Pressure is a physical property and specifies the force exerted on a certain unit area. Its symbol is ...

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Pressure booster system

Wenn der normale Netzdruck einer vorhandenen Wasserversorgungsanlage nicht ausreicht, um höher ...

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Pressure class

Pressure classes are nominal pressure ratings classified in line with the ISO 7268 preferred number ...

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Pressure drop

Pressure drop is defined both as a rapid reduction in pressure in a space, e. g. in a tank, and as a ...

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Pressure exchanger

Pressure exchangers can be used in place of conventional turbine solutions for energy recovery in RO ...

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Pressure fluctuation

Pressure fluctuations are quantitative and qualitative changes in pressure (also see Surge pressure).

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Pressure gauge

A pressure gauge is a device that displays the physical pressure of a fluid. It typically uses the ...

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Pressure head

The pressure head describes the measure for a liquid's pressure and is expressed by: p    Static ...

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Pressure loss

Pressure loss (pL) is a pressure difference caused by wall friction (in pipes) and resistances (in ...

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Pressure measurement

Pressure measurement refers to the process of determining the physical pressure of a fluid and ...

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Pressure vessel

A pressure vessel is a container designed to handle pressures higher than atmospheric pressure (see ...

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Pressure wave

A pressure wave is a short-term pressure fluctuation in the fluid propagating in the form of a wave ...

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Pre-swirl control

Pre-swirl control allows a change in pump head. This requires the installation of a diffuser with ...

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Preventive maintenance

Preventive maintenance is a process whereby suitable sensors are used to determine the level of wear ...

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Primary recirculation pump

Primary recirculation pumps are a type of reactor pump.

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Priming

The suction line of a non-self-priming centrifugal pump must be primed prior to the pump's start-up ...

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Priming stage

The priming stage (self-priming or air extraction stage) is the device within the pump designed to ...

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Principle of conservation of momentum

The principle of conservation of momentum or momentum theorem is a conservation law which states that ...

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Process control system

Process control systems monitor and control automated plants and assume such core tasks as recording ...

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Process pump

The process pump is a centrifugal pump which is used in chemical processes, e.g. in oil refineries ...

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PROFIBUS

The term PROFIBUS stands for "PROcess FieldBUS" and is a universal, open field bus system. This ...

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Profile

The form of a body's cross-section is called the profile. The term flow profile is used in fluid ...

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Profile gasket

The profile gasket is a static sealing element which does not allow any relative motion; the sealing ...

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Progressive cavity pump

Progressive cavity pumps, also known as helical rotor pumps, are rotating positive displacement pumps.

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Propeller

Propellers are a type of turbomachinery designed like an axial flow impeller without a casing. The ...

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Propeller pump

Propeller pump: Tubular casing pump with mixed flow propeller

A common feature of a ship's propeller, a propeller-type mixer and a propeller pump is the axial flow ...

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Propeller-type mixer

The propeller-type mixer is a mixing unit designed with an open, axial propeller and a dry running ...

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Protective earth conductor

Earth conductors are also referred to as earth or earth lines and are designated by the letters PE, ...

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Protective earthing

Protective earthing is a type of earthing that is used to protect people and animals from electric ...

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Protective layer

According to DIN 50 902 a protective layer (also coating) is a cover consisting of one or several ...

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PTC resistor

The PTC (Positive Temperature Coefficient) resistor is also referred to as the PTC thermistor and is ...

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PTC thermistor

The positive temperature coefficient (PTC) thermistor is also referred to as the PTC resistor.

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Pulp

Pulp is a product of digesting finely cut wood and is used to make paper (also see fibrous material).

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Pulp consistency

Pulp consistency should not be confused with the density of fluids handled and is extremely important ...

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Pulp pump

Pulp pump: Back pull-out design, open impeller, wear plate on suction side

Pulp pumps are used for transporting mixtures of liquid and solid components (e. g. fibrous materials ...

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Pulp pumping

Pulp pumping refers to the transportation of pulp suspensions of various pulp consistencies and types (e.

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Pump acceptance test(ing)

The term "pump acceptance testing" refers to the acceptance testing of a pump (also see acceptance test).

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Pump affinity laws

The affinity laws for centrifugal pumps state that the H/Q curves at various rotational speeds can be ...

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Pump application

The range of pump applications is vast, and the nature of each application depends both on the fluid ...

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Pump casing

Pump casings serve to seal off the intside of the pump to atmosphere to prevent leakage and retain ...

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Pump direction of rotation

In conjunction with the rotational speed, the pump direction of rotation is specified as clockwise or ...

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Pump discharge nozzle

A pump discharge nozzle is the cross-section (circular cross-section) to be defined at the pump ...

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Pump efficiency

Pump efficiency (η) is also referred to as coupling or overall efficiency and characterises the ratio ...

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Pump for use in low-lift pumping stations

Pumps for use in low-lift pumping stations are tubular casing pumps and are deployed, as the name ...

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Pump foundation

The foundation of a stationary centrifugal pump must be capable of absorbing the forces and torques ...

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Pumping station

A pumping station is defined as a facility comprising an intake structure, any number of pumps and an ...

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Pump in pull-out design

Pumps in pull-out design are generally vertically installed tubular casing pumps whose rotating ...

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Pump nozzle load

Although a centrifugal pump mounted on a pump foundation should not be used as an anchorage point to ...

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Pump output power

The pump output power is the hydraulic power a pump can provide (also see Power input).

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Pump power output

The pump power output (PQ) is the useful power transmitted to the fluid handled by the centrifugal pump.

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Pump set

A pump set is a unit comprising the drive and the centrifugal pump.

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Pump shaft

The pump shaft transmits the drive torque to the impellers of centrifugal pumps or to the ...

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Pump suction nozzle

The pump suction nozzle is the cross-section (circular cross-section) to be defined at the pump ...

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Pump sump

The intake chamber is often referred to as a pump sump.

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Pump system

In centrifugal pump technology, the pump system, or simply the system, encompasses the space through ...

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Pump test facility

Pump test facility: View of closed-loop test set-up (cavitation test facility)

Für die Entwicklung von Pumpen und die Prüfung der fertigen Produkte bspw. für einen Abnahmeversuch ...

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Pump with top/top or side/side nozzle arrangement

Pumps with top/top or side/side nozzle arrangement are centrifugal pumps whose discharge line and ...

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Pyrometer

A pyrometer is a sensor that measures temperature using thermal radiation.

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