2Nd Class Fireman, High Pressure Boilers, Chapter 1, Notecards

Front 1

ASME code

Back 1

A code written by ASME international that governs and controls the types of material, methods of construction, and procedures used in the installation of boilers.

Front 2

Bent-Tube Boiler

Back 2

A water tube boiler with more than one drum in which shaped tubes connect the drums

Front 3

Boiler

Back 3

A closed vessel used for heating water for generating steam by direct application of heat from combustion fuels or electricity

Front 4

Boiler Horsepower (BHP)

Back 4

The amount of energy equal to the evaporation of 34.5 lb of water/hr from and at a feedwater temperature of 212 degrees Fahrenheit

Front 5

Cogeneration

Back 5

- The process of generating electricity and then using the waste heat from the generating process for heating buildings, providing process heat, or for further electrical generation

- uses high-pressure steam to generate electricity, then uses the discharge steam for heating building or providing process steam or hot water.

- uses the waste heat in exhaust gases to perform useful work. Waste heat passes through heat exchangers to produce hot water or steam for use in plant heating or processes

- by using this method, it is possible for one plant to supply most or all of the required electricity, process steam, heated water, and air conditioning needed for a facility.

Front 6

Compressive Stress

Back 6

Stress that occurs when two forces of equal intensity act from opposite directions and push toward the center of an object

Front 7

Critical Pressure

Back 7

The pressure at which the density of water and steam are the same

Front 8

Dry-Back Boiler

Back 8

A firetube boiler with a refractory-lined rear door that directs the gases of combustion from the furnace to the second-pass tubes and then through succeeding passes if so designed

Front 9

Dry-Top Boiler

Back 9

A vertical firetube boiler in which the upper tube sheet is dry

Front 10

Electric Boiler

Back 10

A boiler that produces heat using electrical resistance coils or electrodes

Front 11

Electromagnetic Induction

Back 11

The production of electricity using a conductor that passes through a magnetic field

Front 12

Field-Erected Boiler

Back 12

A boiler that is assembled on the final site because of size and complexity

Front 13

Firetube Steam Boiler

Back 13

A boiler in which hot gasses of combustion pass through tubes that are surrounded by water

Front 14

Flex-Tube Boiler

Back 14

A water tube boiler in which replaceable serpentine tubes are connected to the upper and lower drums and surround the firebox

Front 15

Furnace

Back 15

The location where the combustion process takes place. Also known as a firebox or combustion chamber

Front 16

Generator

Back 16

- A device that converts mechanical energy into electrical energy by means of electromagnetic induction

- alternating current (AC) generators are the most common generators used to produce electrical power.

Front 17

Heating Surface

Back 17

- The part of a boiler with water on one side and heat and gases of combustion on the other side

- by increasing the heating surface, more heat is transferred from the gases of combustion. This results in more rapid water circulation and faster formation of steam bubbles.

Front 18

High Pressure Steam Boiler

Back 18

A boiler that operates at a steam pressure over 15 psi and over 6 BHP. Also known as a power boiler.

Front 19

Horizontal Return Tubular (HRT) Boiler

Back 19

A firetube boiler consisting of a shell suspended over a firebox

Front 20

Low-Pressure Steam Boiler

Back 20

A boiler that operates at a steam pressure of not more than 15 psi

Front 21

Membrane boiler

Back 21

A water tube boiler that uses strips of metal alloy welded between the tubes to form a seal

Front 22

Motor Control Center (MCC)

Back 22

A central location for troubleshooting and servicing motor control circuits

Front 23

Overcurrent

Back 23

Electrical current in excess of the equipment limit, total amperage load of the circuit, or conductor or equipment rating

Front 24

Package Boiler

Back 24

- A boiler that comes completely assembled, with its own pressure vessel, burner, draft fans, and fuel train

- can be either firetube or watertube

- only requires connecting the feedwater lines, steam lines, fuel lines, electrical connections, and a tie into the breeching and chimney.

Front 25

Panelboard

Back 25

A wall-mounted distribution cabinet containing a group of OCPDs and short-circuit protection devices for lighting, appliance, or power distribution branch circuits

Front 26

Refuse Boiler

Back 26

A boiler that uses the municipal solid waste that would normally go to landfills

Front 27

Scotch Marine Boiler

Back 27

A firetube boiler with an internal furnace

Front 28

Sediment

Back 28

Particles of foreign matter in water

Front 29

Shear Stress

Back 29

Stress that occurs when two forces of equal intensity act parallel to each other but in opposite directions

Front 30

Sludge

Back 30

The accumulated residue produced from impurities in water

Front 31

Straight-Tube Boiler

Back 31

A water tube boiler with box headers connected together by straight, inclined water tubes.

Front 32

Stress

Back 32

Pressure or tension applied to an object

Front 33

Switchboard

Back 33

A panel or an assembly of panels containing electrical switches, meters, busses, and other overcurrent protection devices (OCPDs)

Front 34

Switchgear

Back 34

Any electrical device that switches or interrupts another device or circuit

Front 35

Tensile Stress

Back 35

Stress that occurs when two forces of equal intensity act on an object, which pulls the object in the opposite directions

Front 36

Thermal efficiency

Back 36

The ratio of heat absorbed by the boiler (output) to the heat available in the fuel (input)

Front 37

Transfer Switch

Back 37

An electrical device that transfers the load of building from public utility circuits to the output of a standby power source. Also known as Bypass Switch.

Front 38

Vertical firetube boiler

Back 38

A one-pass firetube boiler that has tubes in a vertical position

Front 39

Waste-Fuel Boiler

Back 39

A boiler that uses fuel or waste heat from an industrial process that would normally be wasted

Front 40

Watertube Steam boiler

Back 40

A boiler that has water inside the tubes with heat and gases of combustion around the tubes

Front 41

Waterwall

Back 41

A set of tubes placed in the furnace area of watertube boilers that are used to increase the heating surface of boilers and to increase service life of refractory

Front 42

Wet-Back Boiler

Back 42

A firetube boiler with three tube sheets and a turnaround chamber, with a water leg formed between the rear tube sheet and the chamber

Front 43

Front (Term)

Back 43

Miniature Boiler Symbol

Front 44

Front (Term)

Back 44

Electric Boiler Symbol

Front 45

Front (Term)

Back 45

Heating Boiler Symbol

Front 46

Front (Term)

Back 46

Safety Valve Symbol

Front 47

Front (Term)

Back 47

Boiler Assembly Symbol

Front 48

Front (Term)

Back 48

Power Boiler Symbol

Front 49

Front (Term)

Back 49

Pressure Piping Symbol

Front 50

Baffles

Back 50

- Used to direct the gases so that they come in close contact with the boiler heating surface

- if these are broken there can be a sudden increase in the temperature of the flue gas going up the chimney and a decrease in boiler capacity

Front 51

Convection Heating

Back 51

A type of heat transfer that occurs due to the circulation of a fluid or gas.

Front 52

Heat Recovery Steam Generator (HRSG)

Back 52

A boiler that uses heat recovered from a hot gas stream, such as hot exhaust gases from a kiln or from a gas turbine.