City of Omaha 3rd Grade N.A.P.E.
Stationary Engineers Test
1.How can you lose your license?: Drinking on the job / sleeping on the job / negligence / unsafe work
/ failing to renew your license annually / signing a falsified licensing application for someone
2.What must you do if you change jobs?: You must notify city hall if you change jobs, change your address or if you retire
3.Why should you do rounds?: You do rounds so that you can find and correct problems to prevent break downs. Keeping
permanent records will make it easier to forecast most breakdowns because you will get to know your equipment.
4.What is a steam Boiler?: A steam boiler is a closed vessel PARTIALLY FILLED with water, under pressure, that transforms
water into steam with the application of heat.
5.What are requirements of a good boiler?: 1. simple
2.designed to accommodate expansion and contraction
3.adequate steam and water space
4.efficient
5.responsive to demands
6.accessible for cleaning and repair
7.safe
6. Name and describe three types of heat transfer used in boiler operation.: RA-
DIANT HEAT-is heat radiated from a hot to cold body and depends on the temperature difference and the color of the body
that receives the heat. The heat from the sun reaches us by means of radiation.
CONDUCTION HEAT-is heat that passes from the gas to the tube by physical contact. The heat passes from molecule of
metal to molecule of metal with no displacement of the molecules.
CONVECTION HEAT-is heat transmitted from a hot to cold body by movement of the conveying substance.
7. What is a combustion chamber?: The area of a boiler where the burning of fuel occurs
8. What is an internally fired boiler and name 4 types.: Internally fired boilers are those in which the grate and combustion
chamber are enclosed within the boiler shell.
Scotch Marine
, City of Omaha 3rd Grade N.A.P.E.
Stationary Engineers Test
Cast iron package
Steam locomotive
Vertical fire tube
9. What is an externally fired boiler and name 4 types.: Externally fired boiler is a boiler in which the setting, including furnace
and grates are separate and distinct from the boiler shell.
Horizontal return tube set on brick
Heine
Cast iron set on brick
Sterling water tube
10. What is a crown sheet and what is its purpose? What is a tube sheet and what
is its purpose?: The crown sheet in a vertical fire tube boiler holds the tubes and is thicker because it is exposed to fire.
The tube sheet holds the tubes and does not see the fire.
11. What is a water leg on a boiler?: A water leg is the space between the outer shell and the furnace shell containing boiler
water. It absorbs heat that would be wasted and increases the capacity of the boiler. The surfaces are flat and must be
stayed.
12. Is an H.R.T. boiler set level or inclined and why?: H.R.T. boilers are inclined 1-3 inches front to rear, for drainage and
removal of impurities.
Boiler tubes are just inclined with the boiler shell.
13. Name 2 ways to support and take care of expansion of an H.R.T. boiler. Which
way is the best?: H.R.T. boiler can be set on saddles on the furnace wall, equipped with rollers to permit movement of the
boiler as it expands and contracts. It may also be suspended from hangers and supported by overhead beams.
Hanging from beams works no hardship on furnace walls.
14. What is a longitudinal joint? What is a circumferential joint?: A longitudinal joint is a
seam running the length of the shell and is butt strap construction or fusion welded. It is above the fire line to avoid
overheating.
Stationary Engineers Test
1.How can you lose your license?: Drinking on the job / sleeping on the job / negligence / unsafe work
/ failing to renew your license annually / signing a falsified licensing application for someone
2.What must you do if you change jobs?: You must notify city hall if you change jobs, change your address or if you retire
3.Why should you do rounds?: You do rounds so that you can find and correct problems to prevent break downs. Keeping
permanent records will make it easier to forecast most breakdowns because you will get to know your equipment.
4.What is a steam Boiler?: A steam boiler is a closed vessel PARTIALLY FILLED with water, under pressure, that transforms
water into steam with the application of heat.
5.What are requirements of a good boiler?: 1. simple
2.designed to accommodate expansion and contraction
3.adequate steam and water space
4.efficient
5.responsive to demands
6.accessible for cleaning and repair
7.safe
6. Name and describe three types of heat transfer used in boiler operation.: RA-
DIANT HEAT-is heat radiated from a hot to cold body and depends on the temperature difference and the color of the body
that receives the heat. The heat from the sun reaches us by means of radiation.
CONDUCTION HEAT-is heat that passes from the gas to the tube by physical contact. The heat passes from molecule of
metal to molecule of metal with no displacement of the molecules.
CONVECTION HEAT-is heat transmitted from a hot to cold body by movement of the conveying substance.
7. What is a combustion chamber?: The area of a boiler where the burning of fuel occurs
8. What is an internally fired boiler and name 4 types.: Internally fired boilers are those in which the grate and combustion
chamber are enclosed within the boiler shell.
Scotch Marine
, City of Omaha 3rd Grade N.A.P.E.
Stationary Engineers Test
Cast iron package
Steam locomotive
Vertical fire tube
9. What is an externally fired boiler and name 4 types.: Externally fired boiler is a boiler in which the setting, including furnace
and grates are separate and distinct from the boiler shell.
Horizontal return tube set on brick
Heine
Cast iron set on brick
Sterling water tube
10. What is a crown sheet and what is its purpose? What is a tube sheet and what
is its purpose?: The crown sheet in a vertical fire tube boiler holds the tubes and is thicker because it is exposed to fire.
The tube sheet holds the tubes and does not see the fire.
11. What is a water leg on a boiler?: A water leg is the space between the outer shell and the furnace shell containing boiler
water. It absorbs heat that would be wasted and increases the capacity of the boiler. The surfaces are flat and must be
stayed.
12. Is an H.R.T. boiler set level or inclined and why?: H.R.T. boilers are inclined 1-3 inches front to rear, for drainage and
removal of impurities.
Boiler tubes are just inclined with the boiler shell.
13. Name 2 ways to support and take care of expansion of an H.R.T. boiler. Which
way is the best?: H.R.T. boiler can be set on saddles on the furnace wall, equipped with rollers to permit movement of the
boiler as it expands and contracts. It may also be suspended from hangers and supported by overhead beams.
Hanging from beams works no hardship on furnace walls.
14. What is a longitudinal joint? What is a circumferential joint?: A longitudinal joint is a
seam running the length of the shell and is butt strap construction or fusion welded. It is above the fire line to avoid
overheating.
