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Equipment II

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Module: Dynamic Pumps / Purpose and Function

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Glossary

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axial pump

A type of pump in which liquid is moved forward in a straight line along the axis.

centrifugal pump

A type of dynamic pump that uses centrifugal force to accelerate a fluid and increase pressure.

dynamic pump

A type of pump that has an impeller which spins around the pump’s axis to move the fluid through the pump.

impeller

A rotating device in a pump used to increase pressure and flow of a fluid.

mixed flow pump

A type of pump with the characteristics of both an axial pump and a centrifugal pump.

pump

A mechanical device that transfers energy to a fluid.

stuffing box

The area around the pump shaft that holds packing in place.

positive displacement pump

A pump that moves a fixed volume of fluid during each cycle.

accumulator

A device used to reduces fluid pressure pulsation by trapping the fluid and returning it to the system using a piston system, diaphragm, or other mechanism.

air infiltration (vapor lock)

A condition where air is pulled into a pumping system or air is trapped in a section of the process line.

brake horsepower

The horsepower required at the pump shaft to pump a liquid at the specified head and flow.

cavitation

A phenomenon that can occur in a liquid, where vapor bubbles form and then implode due to pressure changes within the liquid.

diffuser

Stationary impeller-like disks that may be located in a centrifugal pump cavity to reduce turbulence and improve efficiency by directing the fluid in a more controlled manner into the volute and to the discharge port.

foot valve

A device designed to prevent liquid from draining out of the suction line when the pump is shut down.

Net Positive Suction Head Available (NPSHA)

The total energy available at the discharge of a pump taking into account energy losses in suction piping and increases due to pressure of the fluid and for any suction lift.

Net Positive Suction Head Required (NPSHR)

The energy required by a pump at a given operating point to prevent cavitation.

pump efficiency

The percent of energy that the pump imparts to the liquid divided by the energy the pump requires to do the work.

strainer

Device used to removed solid contaminates from a liquid stream.

blower

A compressor that moves high volumes of air at low differential pressures.

compressor

A mechanical device that increases the pressure of a gas by forcing it into a smaller volume.

dynamic compressor

A category of compressors that accelerate the flow of the gaseous fluid then convert the additional energy generated to pressure.

positive displacement compressor

A category of compressors that displace gas in a chamber and then compress the gas by reducing the volume of the chamber.

reciprocating compressor

A category of positive displacement compressors that use a piston to drive a gas into a smaller space.

rotary compressor

A category of positive displacement compressors that use a rotor to compress a fixed volume of gas during each rotation.

surge

In a compressor or fan, a reduction of flow to one or more of the impellers or stages that causes large differences in discharge pressure.

barometric leg

A length of pipe that drains condensate from condensers or other equipment in a vacuum system.

vacuum

A gas in a closed container that is below the surrounding atmospheric pressure.

vacuum break

Any device or configuration that prevents backflow of air or liquids if vacuum production is interrupted

vacuum system

A vacuum source and the piping and fittings that move gases from a process through the vacuum source to a point where it is vented to the atmosphere.

axial fan

A type of fan in which gas is moved forward in a straight line along the axis.

centrifugal fan

A fan that uses centrifugal force to accelerate a gas and increase pressure.

knockout pot

A device used to prevent liquids containing solids from entering a pump.

mixed flow fan

A fan in which air is drawn through an inlet like a centrifugal fan but exits in a flow path similar to an axial fan.

stall

A condition in which inlet air hits the fan blades at an angle resulting in non-uniform pressure.

variable pitch controller

Electric or pneumatic control devices that control fan airflow volume by blade pitch.

belt drive

A drive component that uses a pulley and belt system to create rotation and torque from a driving shaft to a driven shaft.

chain drive

A drive component that uses a pulley and belt system to create rotation and torque from a driving shaft to a driven shaft.

clutch

Mechanical switch positioned between a motor and a driven shaft on a piece of equipment.

coupling

A mechanical device used to directly connect two shafts into one long continuous unit.

gear drive

A drive component that uses gears to create rotation and torque from a driving shaft to a driven shaft.

induction motor

A type of AC motor in which current is induced from the rotating magnetic field established when the stator is powered.

motor

A machine that converts electrical energy into mechanical energy.

motor control center (MMC)

A cabinet or closet that houses motor controllers, power switches, ground-fault protection, fuses, and contactors.

motor controller

Device use to control the operation of a motor including rotation direction, speed, torque, and overloads.

rotor (armature)

The rotating component in a motor.

slip

The difference between the ideal and actual rotational speed of a piece of equipment.

stator

The stationary component in a motor or other rotary system in or around which the rotor turns.

synchronous motor

A type of AC motor in which power is supplied directly to the rotor which in turn creates a magnetic field around the rotor.

windings

Groups of coiled insulated wires located in a motor stator that form an electromagnet when current is applied to the coil.

circulating oil system

A system that delivers cooled oil continuously to high speed equipment and other applications.

grease gun

A device that delivers grease to a lubrication application.

viscosity

A fluid's resistance to flow.

Learning Aids

Module :

Dynamic Pumps - Learning Aid

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Dynamic Pumps Flash Cards

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Positive Displacement Pumps - Learning Aid

Positive Displacement Pumps - Learning Aid document Download

Positive Displacement Pumps Flash Cards

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Pump Operation - LearningAid

Pump Operation - LearningAid document Download

Pump Auxiliaries and Operation Flash Cards

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Compressors - Learning Aid

Compressors - LearningAid document Download

Compressors Flash Cards

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Vacuum Systems - Learning Aid

Vacuum Systems - Learning Aid document Download

Vacuum Systems Flash Cards

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Fans - Learning Aid

Fans - Learning Aid document Download

Fans Flash Cards

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Motors - Learning Aid

Motors - Learning Aid document Download

Motors Flash Cards

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Lubricating Systems - Learning Aid

Lubricating Systems - Learning Aid document Download

Lubricating Systems Flash Cards

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Dynamic Pumps

Topics

1 . Purpose and Function
2 . Pump Categories
3 . Axial Pumps
4 . Centrifugul Pumps
5 . Impeller Designs
6 . Types of Centrifugal Pumps
7 . Mixed Flow Pumps

Equipment II

Topics

1 . Dynamic Pumps
2 . Positive Displacement Pumps
3 . Pump Auxiliaries and Operation
4 . Compressors
5 . Vacuum Systems
6 . Fans
7 . Motors
8 . Lubricating Systems