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Cable gland

A cable gland is used where the connection cable connects to the terminal box or the housing of the ...

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Cable shield

A cable shield is the conductive sleeve of a cable or lead and protects the conductor inside from ...

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CAN Bus

The term CAN is the abbreviation for Controller Area Network and denotes, in combination with the ...

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Canned motor

Canned motor pump: Single-stage volute casing pump for general industrial applications

The canned motor is a special type of wet rotor motor in which the stator winding is protected from ...

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Canned motor pump

The canned motor pump is a centrifugal pump designated according to the nature of its drive. It is a ...

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Can-type pump

A can-type pump is usually a multistage pump designed for vertical installation. Among other ...

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Capacitive sensor

A capacitive sensor is a measuring instrument that utilises changes in the capacity of a capacitor for e.

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Carbonate hardness

Carbonate hardness is the main cause of water hardness. It is the term used to describe the hydrogen ...

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Cargo oil pump

Cargo oil pumps are installed on board tankers. Their duty is to pump the oil out of the vessel's ...

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Carnot's shock loss

If the pipe diameter or flow cross-section suddenly widens from A1 to A2, the fluid does not enter ...

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Casing

The casing is the outer shell of a pump and is therefore also referred to as a pump casing.

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Cathodic protection

Cathodic protection is a means of protecting surfaces against corrosion (see Corrosion protection).

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Cavern pump

Cavern pump: Cooling of submersible motors with a) cooling shroud; b) can

Cavern pumps are a special type of tank farm pumps. Caverns can take the form of salt deposits, old ...

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Cavitation

Cavitation is defined as the development and sudden collapse of cavities such as vapour bubbles in a ...

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Cavitation erosion

Wear caused by cavitation is referred to as cavitation erosion. Microjets developing during ...

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Cavitation noise

The typical cavitation noise in centrifugal pumps is often compared to the noise created by pebbles ...

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CE marking

The designation CE is the French abbreviation for both "Communauté Européenne" and "Conformité ...

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Centrifugal pump

Centrifugal pumps are based on the working principle of transferring energy to a fluid by altering ...

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Centrifugal pump system

Centrifugal pump systems are pump systems comprising centrifugal pumps.

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Ceramic bearing

A ceramic bearing generally takes the form of a product-lubricated plain bearing made of a ceramic (e. g.

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CFD

CFD stands for Computational Fluid Dynamics (numerical fluid mechanics) and involves numerical ...

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Change in cross-section

A change in the inlet and outlet cross-sections on, for example, piping or pumps always entails ...

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Changeover contact

A changeover contact is part of a relay on which the normally open contact can break or make contact.

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Channel impeller

A channel impeller is an open or closed impeller with a reduced number of vanes. 1, 2 and 3 ...

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Channel vortex

Channel vortices result from the superposition of a uniform flow through a section and a circulatory ...

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Characteristic coefficient

In turbomachinery engineering, various characteristic coefficients are used to characterise operating ...

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Characteristic curve

The characteristic curves of centrifugal pumps plot the course of the following parameters against ...

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Characteristic curves selection chart

A characteristic curves selection chart is the graphic representation of several characteristic ...

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Check valve

A check valve, or non-return valve, prevents reverse flow by ensuring that fluid can only flow in one ...

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Chemical pump

Chemical pumps are used in the petrochemical, food processing and chemical industries as well as in ...

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Chemical resistance table

The resistance of a material to corrosion is a key criterion in material selection for components in ...

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Circular arc vane

A circular arc vane is a vane type which has a circular arc between the vane's leading and trailing ...

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Circulating pump

Circulating pumps are centrifugal pumps designed to generate a forced circulation in a closed system.

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Circulator pump

Circulator pump: Glandless circulator with canned motor

Circulator pumps are centrifugal pumps which maintain a forced circulation of the heated fluid ...

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Circumferential speed

The circumferential speed (u) is the velocity of a point particle performing a circular motion. This ...

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Class

The term class is synonymous with PN and also applies in conjunction with NPS (Nominal Pipe Size, see ...

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Clean water pump

Clean water pumps are used in water supply applications for pumping clean or treated water, e.g.

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Clearance gap cavitation

The static pressure differential up- and downstream of clearance gaps – especially controlled gap ...

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Clearance gap pressure

The clearance gap pressure is the static pressure differential between the pressures at the ...

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Clearance gap width

The clearance gap width usually refers to the distance between the stationary and rotating component ...

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Clockwise impeller

The clockwise impeller is an impeller which rotates in clockwise direction as viewed from the inlet ...

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Close-coupled pump

Close-coupled pumps are characterised by a common motor and pump shaft or by their motor shaft and ...

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Closed-loop control

Closed-loop control (general) Closed-loop control is a procedure during which a quantity to be ...

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Closed-loop test

In the context of centrifugal pump technology, the term "closed-loop test" refers to model testing ...

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Coat of paint

A coat of paint is applied for the purpose of surface protection.

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Coaxial cable

The coaxial cable, or coax cable, is a shielded cable that is bipolar and concentric by design. It ...

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Collecting well

If individual wells have too low a yield (uneconomic pumping), the water from several boreholes is ...

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Collective load profile

Individual load profiles are combined to create a collective load profile.

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Colloid

A colloid is a particle or droplet dispersed in another medium, the dispersion medium.

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Commissioning

Commissioning refers to the time when a machine or system is used for the first time by the operator, ...

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Communications system

A communications system in the stricter sense of the term is a system that enables information and ...

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Commutation

Commutation refers to the electric or electronic transfer of current from one element to another ...

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Compact water supply system

Compact water supply systems are compact systems for automatic water supply. They are used for ...

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Compressibility

Compressibility is defined as the relative change in volume when the pressure changes.

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Concrete casing pump

Concrete casing pumps are tubular or volute casing pumps whose tubular or volute casing consists ...

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Condensate pump

A condensate pump is a centrifugal pump which is named after the type of fluid handled. It is used in ...

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Condition monitoring

Condition monitoring is a concept for keeping track of a product's states so that safety and machine ...

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Constant efficiency curve

Constant efficiency curves, colloquially also referred to as efficiency islands, are lines of ...

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Constant level oiler

Constant level oiler

A constant-level oiler is used to check the lubricant quantity (e. g. in rolling element bearings).

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Contactor

The contactor is an electrical or electronic switch specially designed for high levels of electrical ...

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Continuity equation

The continuity equation is one of the fundamental equations applied in fluid mechanics. It defines ...

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Control by throttling

Control by throttling is used to influence the flow rate in a pump system by varying system resistance.

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Control element

The control element is part of a controlled system and intervenes in a process through closed-loop ...

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Controlled gap seal

The controlled gap seal is a seal frequently used on centrifugal pumps between rotating and ...

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Controller

A controller automatically influences a variable in a technical process based on a setpoint. To this ...

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Control unit

The control unit is the heart of open-loop control systems and comprises electrical and electronic ...

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Coolant pump

Coolant pumps are generally used for cooling applications in the reactor of nuclear power stations.

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Cooling water pump

Cooling water pumps are used for supplying heat exchangers with cooling water. Their flow rate varies ...

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Copper conductor cable

An electric copper conductor cable is a cable whose internal conductor is made from copper. Voltage ...

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Coriolis force

The Coriolis force is an inertial force which acts on bodies that move in a rotating reference frame.

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Corrosion

Corrosion is the reaction of a metallic material with its environment, according to ISO 8044 and VDI ...

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Corrosion phenomenon

Corrosion phenomena are the effects of corrosion on materials. Manifestations of corrosion may take ...

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Corrosion protection

Corrosion protection can be effected by the corrosion itself and by cathodic protection. Protection ...

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Corrosion rate

The corrosion rate indicates the velocity at which corrosion progresses. It is dependent, for ...

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Corrosion resistance

Corrosion resistance describes the resistance of a material to corrosion (also see Chemical ...

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cos

cos φ is also known as power factor.

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Costs

From a business administration perspective, costs are any type of expenditure that can be expressed ...

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Counter-clockwise impeller

The counter-clockwise impeller is an impeller which rotates counter-clockwise as viewed from the ...

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Countershaft

The term countershaft refers to an auxiliary gear unit that reduces the number of revolutions of the ...

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Coupling

A coupling transmits an incoming torque between shafts (see shaft coupling).

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Coupling alignment

Coupling alignment is essential to ensure the trouble-free mechanical operation of a pump set and to ...

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CPU

CPU stands for Central Processing Unit, which is the control and arithmetic unit of a computer or ...

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Critical speed

Critical speed (nk) is the rotational speed at which acting dynamic forces cause a machine component (e.

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Cryogenic pump

The cryogenic pump is also known as a liquefied gas pump.

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Current requirement of electric motors

The average current requirement (J1 in A) of standard three-phase current squirrel-cage motors (see ...

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Current transformer

A current transformer is a special transformer used to measure large alternating currents and has ...

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Curved-tooth gear coupling

The curved-tooth gear coupling is a shaft coupling used for the positive transmission of a moment, ...

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Cyclone

The cyclone is a separator device that uses centrifugal force to remove solids and liquids from gases.

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