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A/D converter

The "A" stands for analog and the "D" for digital. An analog-digital converter is an electronic ...

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Abrasion

Abrasion:  Wear-prone areas in a volute casing pump

Abrasion is a form of wear, caused when the solid components in the fluid handled act mechanically on ...

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Absolute pressure sensor

The absolute pressure sensor is a measuring device (also see Sensor) for converting the physical ...

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Absolute velocity

The concept of absolute velocity is mainly used in turbomachinery design and defines the velocity of ...

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AC

This is the international abbreviation for alternating current.

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Acceptance test

Acceptance tests are often also referred to as acceptance testing. This process consists of carrying ...

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Acceptance test codes

The term "acceptance test codes" refers to the guidelines for carrying out an acceptance test. These ...

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Acceptance testing

Acceptance testing is also often referred to as an acceptance test. In this context, the term ...

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Accumulator

Fig.1 Accumulator: Automatic pressure control in water supply systems

An accumulator is a vessel which is partly filled with liquid and partly with gas (often air); its ...

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Acid-resistant pump

Acid-resistant pumps are chemical pumps used for handling corrosive fluids, for example in the ...

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AC mains supply

The AC mains supply is also referred to as single-phase alternating current and corresponds to a ...

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Acoustics

Acoustics in this context refer to the audible vibrations of pumps and piping that are triggered by ...

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Actuator

An actuator is a control element used to intervene in a process. It converts switching information ...

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Adjustable vane

A vane is considered adjustable if it can be permanently set to the position required once it is ...

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Adjustment mechanism

The adjustment mechanism is a gear unit which allows small propeller pumps to be manually adjusted.

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Aerofoil theory

The aerofoil theory has gained increased importance in the calculation of axial blading (impeller, ...

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Affinity laws

When investigating flow phenomena, cost factors often favour the use of models which are ...

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Aggressive fluid

Fluids are referred to as aggressive when they react with surrounding materials (also see Chemical ...

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Aggressiveness

Aggressiveness describes the effect of a substance on its environment. Descriptive characteristics ...

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Air lift pump

Air lift pumps are also known as mammoth pumps, gas lifts or Löscher pumps, and are used for lifting ...

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Air pump

The air pump is a piston pump which is used for filling a closed container with air, increasing the ...

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Air vessel

The air vessel is used as an accumulator to store compressed air, to separate condensate through ...

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Alternating current

Alternating current is internationally abbreviated as AC and describes the electrical current that ...

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Amortisation

Amortisation or payback are terms used to describe whether and at what point the revenue achieved ...

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Analog data transmission

The signals processed during analog data transmission continually represent the physical quantity ...

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Analog interface

An analog interface is an electrical connection that forwards analog electric signals to downstream ...

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Analog signal

A signal whose strength (amplitude) can continuously take any value between a minimum and a maximum ...

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Angle globe valve

The inlet and outlet ports of an angle globe valve are arranged at right angles to each other.

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Angular velocity

Angular velocity indicates how quickly a rotating body is moving in relation to its axis of rotation, ...

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Apex

The apex is the highest point in a piping system (see also Siphoning line) or efficiency curve (see ...

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Apparent power

Apparent power (PS) is calculated based on effective power (PW) and reactive power (PQ):

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Application

The term "application" can also be used as shorthand for the term application software.

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Application software

Application software is used to process an application-specific task on a computer and should not be ...

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Archimedean screw

The Archimedean screw is a rotating true helicoid which has been used for constant-pressure lifting ...

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Archimedean screw pump

The Archimedean screw pump is used for constant-pressure lifting of a fluid to a given geodetic ...

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Area ratio

The area ratio is used to calculate the required hole diameter of an orifice and is determined via ...

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Asynchronous motor

Fig. 1 Asynchronous motor: Sectional view of asynchronous motor

An asynchronous motor has a passive rotor that is short-circuited permanently (squirrel-cage rotor) ...

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ATEX

The acronym ATEX is the French abbreviation for "Atmosphère explosible" and refers to the two ...

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Atmospheric pressure

In centrifugal pump technology, the term refers to the absolute atmospheric pressure at the ...

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Automatic circuit breaker

The automatic circuit breaker is also known as the automatic switch and is a type of electrical ...

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Automatic recirculation valve

The automatic recirculation or minimum flow valve is a special form of lift check valve installed ...

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Automatic switch

Automatic switches perform the switching operation automatically via electrical switchgear whose coil ...

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Automation

Automation describes the process by which machines are used to perform work that would otherwise be ...

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Auto transformer

An auto transformer reduces motor voltage when operating electric asynchronous motors, thus limiting ...

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Availability

Availability is an indicator of the reliability of an installation, a system or a machine. It may be ...

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Axial

Axial refers to alignment in accordance with an axis.

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Axial flow impeller

An axial flow impeller is an impeller used for transporting the fluid handled along the axis.

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Axial flow pump

An axial flow pump belongs to the family of flow pumps. It is fitted with an axial flow impeller and ...

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Axial force

Axial force is the force that acts in the direction of the axis of a body. This force may be tensile ...

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Axially split design

An axially split centrifugal pump features a pump casing design where the casing is split along the ...

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Axial thrust

The axial thrust is the resultant force of all the axial forces (F) acting on the pump rotor. See Fig.

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