Firetube Boilers Flashcards
Steam is the cooling medium for the upper part of the tubes and the tube sheet in what type of boiler: Vertical fire tube Circular water tube Immersion resistance Vertical tubeless Horizontal fire tube
Vertical fire tube
A wetback scotch marine boiler: Has heating surface surrounding the end section Uses cast iron sections Is externally fired Has a brick setting Has a refractory covered end section
Has heating surface surrounding the end section
The number of combustion gases in scotch boiler seldom exceeds four due to: Breeching leak Chimney height Combustion air pressure Condensate problems stack diameter
Condensate problems
The products of combustion leaving the furnace are referred to as combustion gases or: Excess gases Natural gases Noxious gases Flue gases Stack gases
Flue gases
A boiler which is built ready for installation is the: hRT boiler Packaged Locomotive boiler Firebox boiler Scotch marine boiler
Packaged boiler
A horizontal return tubular boiler is :
A two pass boiler
A water tube boiler
Externally fired constructed entirely of mild steel.
1, 3
A steel plate vertical fire tube unit is divided into two sections and the upper is often called the : Expansion tank Reversing section Flue has collector section Combustion chamber Heat exchanger
Heat exchanger
When comparing vertical and horizontal fire tube boilers, a horizontal fire tube boiler :
Needs more air
Requires more feedwater for a given size
Requires more space for a given capacity
Requires less overhead space for a given capacity
Is less reliable
Requires less overhead space for a given capacity.
Fire tube boilers have their tubes fixed into flat steel plates, otherwise known as: Shells Drums Tubeless Headers Flies
Tubeless
A fire tube boiler is a boiler in which: Water passes through the tubes Combustion gases pass around the tubes Air passes through the tubes Air passes around the tubes Combustion gases pass through the tubes
Combustion gases passes through the tubes
A \_\_\_\_\_\_\_ is a water filled section which surrounds the fire box in locomotive boilers: Buck stay Steam dome Boiler drum Water leg Crown sheet
Water leg
The maximum operating temperature of a hot water heating boiler is: 200degC 100degC 121degC 120degC 160degC
121degC
A scotch marine boiler furnace: Has an internal furnace Is single pass Is externally fired Cannot be fired on coal Is not used in marine applications
Has an internal furnace
Fire tube boilers:
Require special foundations or footings
Are not very rugged relative to portability
Have very specific design pressures to meet customers needs
Require relatively small floor space
Require relatively small floor space
An internal fired boiler:
Must be a water tube type
Requires a setting
Is less efficient then an Alex thermal fire unit
Utilizes a high amount of refractory and firebricks
Has the furnace surrounded by water
Has the furnace surrounded by water
