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191 Cards in this Set

  • Front
  • Back
The actual weight of water vapor in grains or pounds per cubic foot of a mixture of air and water vapor.
ABSOLUTE HUMIDITY
A pressure vessel divided into two chambers by means of a rubber diaphragm, having a liquid stored under pressure in one chamber and nitrogen gas in the other.
ACCUMULATOR
An electrically powered oil pump in the turbine lubricating oil system that serves as a backup to the auxiliary (motor-driven) oil pump.
AC TURNING GEAR OIL PUMP
AFTER CONDENSER
The second stage air ejector condenser.
The pressure of the steam between the main stop valve bypass and the control valves.
AFTER-SEAT PRESSURE (STOP VALVE)
An air manifold connecting the condenser to the air removal
system.
AIR OFF TAKE
AMBIENT AIR
The air surrounding or encompassing an object.
The difference between the temperature of the water leaving the
tower and the wet bulb temperature of the ambient air.
APPROACH
A desuperheater using an atomized water spray directed into the steam path.
ATTEMPORATOR
A device that
automatically increases or decreases generator load within a specified band to meet system demands for power.
AUTOMATIC LOAD FREQUENCY CONTROLLER
Steam coils used to heat incoming air to air preheaters.
AUXILIARY AIR HEATER
A pump in a turbine lubricating oil system; used to provide hydraulic and lubricating oil during startups and shutdowns, when turbine speed is too slow for the main oil pump to be effective; driven by an electrically powered motor.
AUXILIARY (MOTOR-DRIVEN) OIL PUMP
BALANCE LINE
A pressure equalizing line.
A bushing, sleeve, box, or shell within which the shaft rotates.
BEARING
Supports for turbine bearings and turbine casings.
BEARING PEDESTALS (STANDARDS)
The pressure of the steam between the boiler and the main stop valves; also called "throttle" pressure.
BEFORE-SEAT PRESSURE (STOP VALVE)
Steam removed from the turbine for feed water heating.
BLEED STEAM
To eject or drain a portion of a liquid from a system, usually to lower chemical concentration.
BLOWDOWN
A pump in a turbine lubricating oil system; designed to draw oil from an oil reservoir and pump it to the main pump.
BOOSTER OIL PUMP
A drive mechanism in a turbine lubricating oil system; designed to drive the booster oil pump.
BOOSTER OIL TURBINE
The trade name of a lubricating oil conditioner.
BOWSER
CASING (SHELL)
The outer covering of a turbine.
Vaporization of fluids due to pressure loss which forms vapor
pockets, and upon collapse, produces vibrations, noise, and destruction of the surrounding walls.
CAVITATION
A centrifugal separating machine used to remove water and solids from lubricating oils. TWO principle makes are De Laval and Sharpies.
CENTRTFUGE
Condenser circulating water pump.
CIRCULATOR
A restriction in fuel oil line caused by coil fuel oil.
COLD PLUG
A pump used to maintain a fixed
pressure difference across the tips of fuel oil burners, irrespective of the supply pressure.
CONSTANT DIFFERENTIAL PUMP
The continuous removal of quantity of boiler water for the purpose of controlling the boiler water chemical concentrations and suspended matter.
CONTINUOUS BLOW
The first stage of a turbine, consisting of a nozzle block and a row of moving blading.
CONTROL STAGE
Steam valves leading to a turbine's inlet that regulate the amount of steam supplied to the turbine and consequently the amount of energy that the turbine receives; valves designed to regulate the flow of steam into the HP turbine during normal operation, and to serve as a backup to the main stop valves during shutdowns, to shut off the flow of steam into the HP turbine; sometimes called governor valves.
CONTROL VALVES
The difference between the
incoming and outgoing water temperatures in a cooling tower. This is the same as the temperature of the cooling water appearing at the inlet and outlet of the condensers.
COOLING RANGE
A device used to measure the amount of particulate matter in the hydrogen inside a hydrogen-cooled generator.
CORE MONITOR
A turbine cylinder arrangement in which steam flows through one cylinder in one direction and through another cylinder in the
opposite direction, or from the center of one cylinder to each end.
COUNTER FLOW
A turbine speed at which the rotor will vibrate excessively.
CRITICAL SPEED
A turbine cylinder arrangement
consisting of two cylinders and two shafts that drive two generators,
which are tied together electrically.
CROSS-COMPOUND (TURBINE)
A generating unit consisting of two or more generators that are electrically connected so that they function as one unit.
CROSSCOMPOUND UNIT (GENERATOR)
A metal multidisc liquid filter which is cleaned by rotating an external handle which turns the inner discs.
CUNO FILTER
A turbine rotor assembly and casing as a unit.
CURTIS STAGE
A pump in the lubricating oil
system; often powered by the station battery and designed to supply lubricating oil when ac power is unavailable.
DC TURNING GEAR OIL PUMP
Tanks in a seal oil system that remove hydrogen and air trapped in oil.
DETRAINING TANKS
A row of fixed blading that consists of an inner ring, which surrounds the shaft, and an outer ring, which attaches the row to the turbine casing.
DIAPHRAGM
The difference between the rates at
which a turbine rotor and a turbine shell expand or contract in response
to temperature changes.
DEFERENTIAL EXPANSION
A type of turbine rotor in which the moving blades are mounted on discs, called wheels, that are raised up from the shaft.
DISC TYPE ROTOR
DOUBLE CASING
A turbine casing consisting of two walls: an inner casing and an outer casing.
A steam flow arrangement in which steam enters a turbine cylinder in the center and flows in two directions.
DOUBLE FLOW
Tubes connected to the main stream drum below water level and to the lower headers to ensure positive water circulation.
DOWNCOMERS
Usually used to describe a current of air. However, in steam boiler
usage it generally describes a difference in air pressures between sections of the boiler or between the boiler and outside air. This is normally expressed as "inches of water."
DPAFT
An airtight pipe or channei extending downward into the
tailrace from a turbine wheel located above it, to make the whole fall
available.
DRAFT TUBE
Manual or motor-operated valves designed to remove moisture from a turbine.
DRAIN VALVES
The removing of excess fluid from a system.
DRAW OFF
Condensate leaving heat exchangers and steam lines.
DRIPS OR DRAINS
A turbine rotor that consists of an enlarged portion of the shaft, called a dm The turbine's moving blades are mounted directly onto the drum.
DRUM TYPE ROTOR
The air temperature as indicated by any sort of a thermometer which is not
affected by the moisture of the air.
DRY BULB TEMPERATURE
Turbine spindle accessory for balancing axial and thrust.
DUMMY BALANCE PISTON
A storage tank for receiving and holding dirty or contaminated
lube oil.
DUMP TANK
The degree of deviation from absolute roundness; the amount that the rotor deviates from its normal center of rotation.
ECCENTRICITY
A tube nest through which feed water passes to steam drum, designed to recover heat from flue gases.
ECONOMIZER
The ratio of the useful work output of a machine to the total work input.
EFFICIENCY
A governor that typically consists of three elements: a speed sensor, electronic circuitry designed to develop an error signal, and a torque motor.
ELECTRONIC GOVERNOR
A turbine valve designed to prevent overspeeding and steam leakage through the mid-span seal in the event of a turbine trip or shutdown.
EMERGENCY BLOWDOWN VALVE
ENERGY
The capacity of a body to do work.
EXHAUST HOOD
The exhaust section of the outer casing in the LP turbine.
A turbine support system designed to minimize exhaust hood expansion and thus reduce stress on turbine parts.
EXHAUST HOOD COOLING SYSTEM
EXHAUST TRUNK
Turbine exhaust connection to the condenser.
Turbine blading that is fixed to the casing; consists of nozzle-shaped blades that direct steam flow through the turbine and supply high velocity steam to the moving blading.
FIXED BLADING(STATIONARY BLADING)
A tank used to "flash” high pressure-temperature water into
steam and water at a lower pressure. It is used to recover heat from drips and drains and to recover heat and water blowdown water.
FLASH TANK
FLOW CONTROL VALVE
A valve for throttling flow or pressure.
A device that provides a means of visually checking the oil leaving a bearing; also called a sight box or a sight glass.
FLOW INDICATOR
Parts of some mechanical governors; consisting of a set of weighted arms connected together by a spring.
FLYWEIGHTS
A heavy wheel for opposing and moderating by its inertia any
fluctuation of speed in the machinery with which it revolves.
FLYWHEEL
A method of starting a turbine in which steam is distributed equally through the control valves to each section of the nozzle block so that the turbine is heated evenly.
FULL ARC ADMISSION
A plant boiler, turbine, generator, and associated systems and equipment.
GENERATING UNIT
GENERATOR LOAD
The number of megawatts produced by a generator.
A component designed with grooves and ridges, usually supplied with water, steam or oil used to prevent leakage of gases or liquids along a rotating shaft.
GLAND SEAL
A turbine support system designed to prevent air from leaking into the turbine and prevent steam from leaking out; sealing is accomplished by supplying steam to a series of glands located along the turbine shaft.
GLAND SEAL SYSTEM
GOVERNOR
A device used to maintain the speed of a turbine at a desired value.
GOVERNOR CONTROL SWITCH
A switch used to operate the turbine
control valves, and thus regulate load changes.
HEAD PRESSURE
Positive pressure at a given point in a liquid system, normally expressed in feet of water.
HEAD TANK
An elevated storage tank for supplying a system by gravity flow.
A procedure in which the speed of a turbine is held constant for a specified length of time; a method used to bring steam-to-metal temperature mismatches back to normal.
HEAT SOAK
An adjustable turbine control device used to limit the maximum load the machine will pick up or carry.
HIGH BLOCK
A circuit designed to activate a solenoid trip when turbine vibration exceeds the maximum limit established by the turbine manufacturer.
HIGH VIBRATION TRIP
The English unit of power, equal to work done at the rate of 550 foot-pounds per second or 33,000 foot-pounds per minute.
HORSEPOWER
HOTWELL
Condensate drain reservoir.
A device, consisting of a casing, a piston, and a spring, that is commonly used to operate a control valve.
HYDRAULIC ACTUATOR
This is a device that typically consists of
a centrifugal pump mounted on, and driven by, the shaft of a turbine.
A relay connected to this device converts the discharge
pressure of this device to a mechanical action.
HYDRAULIC GOVERNOR
A device that removes moisture from the hydrogen circulating inside a hydrogen-cooled generator.
HYDROGEN DRYER
A liquid operated mechanism by which hydraulic
forces are converted into mechanical energy. Such motors are used as valve operators, etc.
HYDROMOTOR
IGNITOR
Fuel burner igniting device.
Moving blading in which the space between blades is the same size at the blading inlet and the blading outlet. Energy transfer in impulse blading results in a decrease in steam velocity.
IMPULSE BLADING
Turbine steam valves designed to admit reheated steam to the IP turbine during normal operation, and to regulate or shut off the flow of steam to the IP turbine during emergencies or shutdowns; also designed to minimize turbine overspeed caused by a load rejection.
INTERCEPT VALVES
INTER CONDENSER
The first stage air ejector condenser.
A turbine valve that is part of the main stop valve; designed to regulate the control of steam flow into the turbine during startups.
INTERNAL BYPASS VALVE
IRON HORSE
The generator hydrogen seal oil supply and purification
apparatus.
Conductors that connect a generator to a main
transformer.
ISOLATED-PHASE BUS
A device to drain the inter and after condensers and prevent
air from entering the system.
JET DRAINERS
A short term for steam jet air ejectors or steam jet vacuum pumps.
JETS
JOURNAL BEARING
A bearing that surrounds a turbine shaft and maintains the rotor's radial position.
The first valve in a high pressure line adjacent to the
steam drum or heater shell, etc.
KEEPER VALVE
A component of the gland seal system made of grooves
and ridges that form a maze or tortuous path to restrict the passage of a fluid such as air or steam.
LABYRINTH SEAL
An open metal ring between rings of packing in a stuffing
box used to admit a sealing or lubricating fluid.
LANTERN RING
A unit used for removing moisture from hydrogen. It contains activated aluminia as the drying agent which is regenerated by heating and blowing with air.
LECTRODRYER
Fisher Governor Company controlling device
LEVELTROL
LOAD
The amount of electrical usage in a power system
LOUVRES
Vanes for directing and controlling air or gas flow
An adjustable turbine control device used to control teh amount of load the machine will carry but having a provision for increasing said load by transferring control to governor or high block when the speed or frequency drops below a preset minimum.
LOW BLOCK
A circuit designed to activate a solenoid trip when vacuum in a condenser decreases to a preset limit.
LOW VACUUM TRIP
A circuit designed to activate a solenoid trip when the
lubrication oil pressure falls below a certain value.
LUBE OIL TRIP
A turbine support system designed to provide lubricating oil to the turbine. Lubrication prevents metal-to-metal contact between stationary and rotating parts and abnormal wear due to friction.
LUBRICATING OIL SYSTEM
A component of the turbine's lubricating oil system;
this component that is attached to and driven by the turbine rotor, and whose
discharge pressure is dependent on rotor speed; designed to provide turbine
lubricating oil during normal operation.
OIL PUMP
These valves designed to admit steam to the HP turbine during normal operation, shut off the flow of steam during shutdowns, and regulate the flow of steam during startups; also called "throttle valves."
MAIN STOP VALVES
The adding of fluid to a system to offset such losses as may occur by leakage, blowdown, etc.
MAKE UP
MANUAL TRIP
A trip that is initiated by an operator.
An instrument designed to measure the amount of load a turbine is carrying.
MEGAWATT RECORDER
A primary device used for establishing pressure differentials used in the measurement of flow through pipes.
METER ORIFICE
A seal between the HP and IP sections of the turbine;
prevents steam from leaking between the two sections during normal operation.
MID-SPAN SEAL
Turbine blading that is attached to the shaft and converts the thermal energy in steam into mechanical energy.
MOVING BLADING (BUCKETS)
MULTI-CYLINDER TURBINE
A turbine consisting of two or more cylinders.
NONRETURN VALVE OR REVERSE CURRENT VALVE
A valve used to prevent backflow of steam or water to turbine.
NOZZLE
A set of fixed blades.
The first row of fixed blading in the control stage of a turbine. The blades are usually separated into groups so that each group can be supplied with steam from an individual control valve.
NOZZLE BLOCK
ORIFICE
Device for restricting flow or reducing pressure.
A device consisting of a wheel and a bolt-spring assembly that activates the trip finger of the turbine trip system.
OVERSPEED MECHANISM
A trip that is activated when the speed at which the turbine rotates exceeds a specific rated value.
OVERSPEED TRIP
A condition that occurs after the transfer point in a turbine startup; a state in which steam is admitted through only part of the nozzle block at a time, as a result of the sequential opening and
closing of the control valves.
PARTIAL ARC ADMISSION
The number of parts of the material as compared
to one million parts of water. One pound of salt in one million pounds of water is one part per million of salt.
PARTS PER MILLION
The process in which shrouding is attached to a row of moving blading by hammering tenons on the blades through holes in the shrouding to rivet the shrouding to the blading.
PEENING
PERCENTAGE HUMlDITY
Relative humidity expressed as a percentage.
A device that is commonly used to regulate the flow of oil
into and out of a hydraulic actuator.
PILOT VALVE
POWER
The amount of work done in a given interval of time. Or stated another way, the rate at which work is done.
A device used to reduce pump
stuffing box pressures. It is also called a throttle bushing by some manufacturers.
PRESSURE BREAKDOWN BUSHING
A flow restriction used to reduce a pressure by limiting the flow.
PRESSURE BREAKDOWN ORIFICE
A period during which a turbine is warmed while still
on turning gear; a turbine warm up phase expressed in terms of a minimum length of time required to reach a certain temperature.
PRE-WARMING
PRIMARY SUPERBEATER
Low temperature elements or first stage of steam superheating.
A turbine startup procedure in which a vacuum is established in the main condenser.
PULLING VACUUM
A sequence of operations involving a continuous time
interval during which combustible gases are removed from the boiler
and fuel cannot be admitted.
PURGE CYCLE
An interrelated combinaton of boiler safety devices which must be satisfied before the initiation of the purge cycle.
PURGE INTERLOCK
A device that measures the percentage of hydrogen in air inside a hydrogen-cooled generator.
PURITY ANALYZER
QUENCH WATER
Water used to quench steam and prevent flashing in
stuffing box.
For a generator, the speed at which the generator changes load.
RAMP RATE (GENERATOR)
The rate at which turbine metal temperature can be
increased each hour during startup or decreased each hour during shutdown.
RAMP RATE (TURBINE)
RATED VOLTAGE
The amount of voltage that a generator is designed to
produce.
Moving blading in which the space between blades is smaller at the exhaust than at the inlet. Energy transfer in reaction blading results in a decrease in steam pressure and velocity.
REACTION BLADING
A procedure for removing moisture from the desiccant inside a hydrogen dryer.
REGENERATION (HYDROGEN)
A section of the turbine where steam is given additional heating, enabling the steam to perform more useful work in the rest of the turbine.
REHEATER
Turbine steam valves designed to admit reheated steam to the IP turbine during normal operation and to shut off the flow of steam during shutdowns or emergencies.
REHEAT STOP VALVES
REST TANK
A settling tank for storing and resting used lube oil.
A device that controls current flow by increasing or decreasing the amount of resistance in a circuit.
RHEOSTAT
ROTOR
The rotating member of a machine.
A condition in which the rotor of a turbine expands faster than the shell.
ROTOR-LONG CONDITION
A condition in which the rotor of a turbine contracts faster than the shell.
ROTOR-SHORT CONDITION
The general power plant usage of this term means steam which contains no superheat for the pressure involved, i.e., the
pressure-temperature relation is as shown in the steam tables for saturated steam. Saturated steam may be either "dry" or "wet", that is, it may or may not contain excess moisture.
SATURATED STEAM
Boiler water circulating tubes used as a screen to shield the secondary superheater from furnace radiation.
SCREEN TUBES
Apparatus located in upper part of main steam drum designed to cause abrupt change in direction of steam flow to throw out moisture and entrained solids by centrifugal force.
SCRUBBERS
A generator auxiliary system that maintains oil flow through seals at each end of the rotor; seals the inside of the generator from the outside.
SEAL OIL SYSTEM
High temperature element or final stage of steam superheating.
SECONDARY SUPERHEATER
A mechanism controlled by governor oil to operate steam inlet valves on a turbine.
SERVOMOTOR
A metal band attached to the outer edge of a turbine's moving blading to dampen blade vibration.
SHROUDING
An adjusting device for controlling the air flow to each fuel burner.
SHUTTERS (ALSO REFERRED TO AS AIR DOORS)
A visible means for detecting flow through a pipe.
SIGHT FEED
A type of turbine casing in which all the turbine elements are contained within a single enclosure.
SINGLE CASING
A generator that has only one group of
stator windings.
SINGLE PHASE GENERATOR
A baffled tank used for separating oil from water.
SKIM TANK
The act of listening for any unusual or abnormal noises in a turbine.
SOUNDING OUT
A device designed to adjust the speed of a turbine by controlling the amount of steam admitted by the turbine governor. It changes the speed of rotation before the unit is synchronized and can be used to change the load after the unit is synchronized.
SPEED CHANGER
STAGE
One row of fixed blading and one row of moving blading.
STATOR
The fixed, or nonmoving, part of a generator.
The difference in temperature between the steam and the metal in a turbine.
STEAM-TO-METAL TEMPERATURE MISMATCH
One of a set of timber pieces, usually square, which serve to form a dam to check the flow of water.
STOP LOG
Conversion chart to convert the depth of oil in a tank in feet and inches to the volume in barrels.
STRAPPING CHART
A heat exchanger installed in the side of the fuel oil storage tank and piped to the suction of the transfer pump. It is used to heat only that portion of fuel oil which flows to the suction of the pump.
SUCTION HEATER
SUPERHEATED STEAM
Steam heated above its saturation temperature.
A standpipe or storage reservoir at the downstream end of a closed feeder pipe to prevent sudden variations in pressure and to furnish water quickly.
SURGE CHAMBER (TANK)
A turbine cylinder arrangement in which one shaft (or several shafts that are coupled together), drives one generator.
TANDEM-COMPOUND
A raised knob on the end of a moving blade that is peened over shrouding to rivet the shrouding to the blading.
TENON
The steam pressure between the boiler and the main stop valves; also called "before-seat" pressure.
THROTTLE PRESSURE
A turbine steam flow control
device used to automatically lit the amount of steam flowing through
the turbine so that the boiler pressure will not be lowered below a preset minimum.
THROTTLE PRESSURE REGULATOR
A force created when moving steam strikes the blades in the turbine; the thrust is in the direction of the steam flow.
THRUST
A bearing consisting of two thrust plates, which surround a turbine shaft and, one thrust runner, which is an integral part of the shaft. Axial rotor movement is prevented by the thrust plates blocking the movement of the thrust runner.
THRUST BEARING
A circuit designed to activate a solenoid trip when turbine movement exceeds a certain preset value.
THRUST BEARING TRIP
Any pipeline installed in or adjacent to a companion for the purpose of heating the contents of the companion line by the passage of steam or hot condensate through the tracer.
TRACER LINES
A point during startup when control of
steam flow is transferred from the stop valves to the control valves.
TRANSFER POINT (TURBINE)
An accessory or the act of divorcing a piece of equipment from its source of energy.
TRIP
A motor-driven reduction gear used for slowly rotating
the turbine spindle to maintain an even heat distribution and prevent
distortion of the shaft during shutdown periods.
TURNING GEAR
A valve connected to the main condenser that, when opened, lets air into the condenser, thus breaking its vacuum; closed during startup and on line and usually opened during shutdowns.
VACUUM BREAKER
A vacuum pump used to remove potentially dangerous gases and vapors from the turbine lube oil reservoir.
VAPOR EXTRACTOR
A turbine valve designed to prevent the turbine from overheating during a turbine trip or shutdown by discharging hot, trapped steam to a low pressure area
VENTILATOR VALVE
A primary device used for establishing pressure differentials used in the measurement of flow through pipes.
VENTURI
A device used for detecting the presence of moisture in a generator housing.
WATER DETECTOR
WATER INDUCTION
The entrance of water into a turbine.
A turbine support system that uses water to seal air out of the turbine and seal steam in.
WATER SEAL SYSTEM