High and Low Pressure Boilers Question
and answers.
condensate - (correct answer) - steam that has lost its heat and returned to water
feed water - (correct answer) - water that is treated for use in the boiler
back flow preventer - (correct answer) - (check valve) prevents flow of the boiler water back to the city
water line
thermo dynamics - (correct answer) - how heat is transferred (high to low) and created
sensible heat - (correct answer) - heat that can be measured with a thermometer or sensed
latent heat - (correct answer) - change in state and no temperature change of substance
heat transfer - (correct answer) - movement of heat from one material to another (conduction,
convection, radiation)
heat exchange - (correct answer) - anything that transfers heat from one substance to another without
allowing the materials to mix
combustion - (correct answer) - the rapid union of oxygen with an element or compound that results in
the release of heat (perfect, complete, incomplete)
primary air - (correct answer) - air that controls the combustion rate
secondary air - (correct answer) - dressed the flame
excess air - (correct answer) - air above the theoretical amount required to burn the fuel
, how many pounds of air are required to burn a pound of fuel - (correct answer) - 14 to 15lbs
MAWP - (correct answer) - maximum allowable working pressure
Boiler Horse Power - (correct answer) - evaporation of 34.5 lbs/hr of water @ 212 degrees (33,472
BTU/hr)
fire tube boiler - (correct answer) - heat and gases of combustion pass through tubes surrounded by
water (scotch marine boiler)
water tube boiler - (correct answer) - water passes through tubes surrounded by gases of combustion
ASME - (correct answer) - American Society of Mechanical Engineers
High Pressure Boiler - (correct answer) - has a MAWP above 15 psi and over 6 boiler hp
Low Pressure boiler - (correct answer) - has a MAWP below 15 psi
Atmospheric pressure - (correct answer) - pressure caused by the weight of air surrounding the earth
(14.7 psi at sea level, every 1000 ft we lose 1/2 lb)
Absolute pressure - (correct answer) - the sum of guage pressure and atmospheric pressure (add 14.7)
package boiler - (correct answer) - preassembled at the factory
field erected boiler - (correct answer) - constructed on site
tube sheet - (correct answer) - metal sheet in which the boiler tubes are mounted
refractory - (correct answer) - brick and/or non flammable material used to insulate the outer surface of
the boiler
tube bank - (correct answer) - an assembly of tubes in the boiler
HRT - (correct answer) - horizontal return tubular boiler
straight tube water tube boiler - (correct answer) - straight tubes surrounded by gases of combustion
safety valve - (correct answer) - prevents the boiler from exceeding its MAWP (located on top of the
boiler
chattering - (correct answer) - rapid opening and closing of the safety valve
safety valve capacity - (correct answer) - amount of steam in pounds per hour capable of venting
huddling chamber - (correct answer) - recessed area in the safety valve that increases the surface area
blow back - (correct answer) - drop in pressure of 2 psi to 4 psi when safety valve releases
and answers.
condensate - (correct answer) - steam that has lost its heat and returned to water
feed water - (correct answer) - water that is treated for use in the boiler
back flow preventer - (correct answer) - (check valve) prevents flow of the boiler water back to the city
water line
thermo dynamics - (correct answer) - how heat is transferred (high to low) and created
sensible heat - (correct answer) - heat that can be measured with a thermometer or sensed
latent heat - (correct answer) - change in state and no temperature change of substance
heat transfer - (correct answer) - movement of heat from one material to another (conduction,
convection, radiation)
heat exchange - (correct answer) - anything that transfers heat from one substance to another without
allowing the materials to mix
combustion - (correct answer) - the rapid union of oxygen with an element or compound that results in
the release of heat (perfect, complete, incomplete)
primary air - (correct answer) - air that controls the combustion rate
secondary air - (correct answer) - dressed the flame
excess air - (correct answer) - air above the theoretical amount required to burn the fuel
, how many pounds of air are required to burn a pound of fuel - (correct answer) - 14 to 15lbs
MAWP - (correct answer) - maximum allowable working pressure
Boiler Horse Power - (correct answer) - evaporation of 34.5 lbs/hr of water @ 212 degrees (33,472
BTU/hr)
fire tube boiler - (correct answer) - heat and gases of combustion pass through tubes surrounded by
water (scotch marine boiler)
water tube boiler - (correct answer) - water passes through tubes surrounded by gases of combustion
ASME - (correct answer) - American Society of Mechanical Engineers
High Pressure Boiler - (correct answer) - has a MAWP above 15 psi and over 6 boiler hp
Low Pressure boiler - (correct answer) - has a MAWP below 15 psi
Atmospheric pressure - (correct answer) - pressure caused by the weight of air surrounding the earth
(14.7 psi at sea level, every 1000 ft we lose 1/2 lb)
Absolute pressure - (correct answer) - the sum of guage pressure and atmospheric pressure (add 14.7)
package boiler - (correct answer) - preassembled at the factory
field erected boiler - (correct answer) - constructed on site
tube sheet - (correct answer) - metal sheet in which the boiler tubes are mounted
refractory - (correct answer) - brick and/or non flammable material used to insulate the outer surface of
the boiler
tube bank - (correct answer) - an assembly of tubes in the boiler
HRT - (correct answer) - horizontal return tubular boiler
straight tube water tube boiler - (correct answer) - straight tubes surrounded by gases of combustion
safety valve - (correct answer) - prevents the boiler from exceeding its MAWP (located on top of the
boiler
chattering - (correct answer) - rapid opening and closing of the safety valve
safety valve capacity - (correct answer) - amount of steam in pounds per hour capable of venting
huddling chamber - (correct answer) - recessed area in the safety valve that increases the surface area
blow back - (correct answer) - drop in pressure of 2 psi to 4 psi when safety valve releases
