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Radial flow pump

Radial flow pumps are centrifugal pumps at which the fluid handled leaves the impeller in a radial ...

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Radial force

Radial force generally means a force exerted in a radial direction towards the centre or away from ...

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Radial impeller

A radial impeller is an impeller at which the flow (see Flow rate) leaves the impeller in radial ...

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Radially split design

If a centrifugal pump's pump casing features a vertical joint relative to the shaft, this is referred ...

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Radial thrust

Radial thrust in centrifugal pump engineering is a hydraulic radial force in the plane of the ...

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Rainwater harvesting system

Rainwater harvesting system: Example of rainwater harvesting

A rainwater harvesting system collects and uses rainwater to meet some or all of the water ...

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Rate of drainage

Rate of drainage is a term used in land drainage, i.e. dewatering through an underground pipe system.

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Reactive power

Many electric consumers require reactive power to build and dissipate their magnetic fields. It ...

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Reactor internal pump

Reactor internal pumps are reactor pumps which are arranged in the reactor pressure vessel, thus ...

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Reactor pump

The reactor pump which acts as a reactor coolant pump is a centrifugal pump, which circulates the ...

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Reduction of impeller vane diameter

This form of impeller trimming involves the reduction of the impeller vane tips on centrifugal pumps ...

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Reed relay

A reed relay is a relay used to switch a circuit and integrates a reed contact. The reed contacts ...

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Refinery pump

Refinery pump: Horizontal model in back pull-out design

Refinery pumps transport petroleum and its derived products in refineries, petrochemical plants and ...

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Relative velocity

The concept of relative velocity (w) is used in turbomachinery design and defines the velocity of a ...

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Relay

Relays are electrical devices/components that are operated via electric current. They are usually ...

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Remote control switch

The remote control switch is an electrical switchgear operated by mechanical force (also see Relay, ...

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Remote control system

A remote control system remotely performs open and closed loop control, protection or ...

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Remote data transmission

Remote data transmission, or RDT, describes data transmission as it takes place between computers via ...

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Renewable energy

Renewable energies are regenerative or alternative energies which make use of energy from natural and ...

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Repair

According to DIN 31051 this term denotes measures that are taken to restore a system's technical ...

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Residual current device

A residual current device is a safety device that disconnects a power circuit whenever it detects an ...

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Resistive sensor

A resistive sensor measures changes in electrical resistance caused by the application of force, e. g.

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Restart inhibit

The restart inhibit is a facility that prevents a machine from restarting automatically.

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Return guide vane

The return guide vanes of a multistage radial pump (e. g. boiler feed pump) form a guiding device ...

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Reverse flow

Reverse flow occurs if pumping is interrupted, for example, due to a power failure and if the check ...

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Reverse osmosis

Reverse osmosis (RO) is a physical process used to separate substances. Its purpose is to use a ...

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Reverse running speed

The reverse running speed is the speed that occurs in a centrifugal pump when the fluid flows in ...

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Reynolds number

The Reynolds number is a dimensionless characteristic coefficient used in fluid mechanics. It ...

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Ring-section pump

A ring-section pump is a pump with several stage casings of the same type in tandem arrangement (see ...

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River turbine

River turbine: Schematic diagram

A river turbine is based on the innovative concept of directly converting the kinetic energy of the ...

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Rolling element bearing

The rolling element bearing is used to support shafts and consists of the bearing races or discs and ...

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Rotary vane pump

Rotary vane pumps are rotating positive displacement pumps whose displacement element is an ...

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Rotating assembly

A centrifugal pump's rotating assembly encompasses the impeller, the pump shaft and all associated ...

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Rotational speed

Rotational speed (also called speed, or speed of rotation) can be quantified as the number of ...

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Rotor

The rotor is the rotating, moving part of an electric machine. On direct current motors, the term ...

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Rubber-lined pump

A rubber-lined pump is a centrifugal pump whose wetted components are covered with a rubber lining. A ...

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Rumor limit

In the case of high specific speed centrifugal pumps, the operating limit under low flow conditions ...

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Runaway speed

The maximum rotational speed of the drive of a centrifugal pump is called runaway speed. It is only ...

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Run-down time

The period of time a centrifugal pump needs from the time the drive is switched off or stops due to a ...

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Run-up time

The run-up time is the period of time during which the drive (see Drive) is started and accelerated ...

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