MN Boiler Exam Latest Questions & Answers.
Cast Iron Sectional Boiler
Like Bread, sections in between are intermediate.
Held together with push nipples and stay bolts.
No special foundation required
Expandable (can add more centers to increase heating capacity)
Boiler trim mounted on end se...
MN Boiler Exam Latest Questions & Answers.
Cast Iron Sectional Boiler
Like Bread, sections in between are intermediate.
Held together with push nipples and stay bolts.
No special foundation required
Expandable (can add more centers to increase heating capacity)
Boiler trim mounted on end sections
Disadvantage: Always low pressure
Advantage: corrosion resistant
Firetube boiler
used for heating and process
Gas/heat of combustion on one side and water on outside.
Horizontal Return Tubular
Type of firetube
Drum supported by Lugs and Slings
Old construction, not efficient because of External furnace
2 pass construction
Bridgewall
Baffle inside HRT boiler furnace to direct flow of combusting gases for greatest
efficiency
Scotch Marine
Most common, most efficient Firetube boiler.
Comes in 2, 3, or 4 pass construction
Round tube furnace usually corrugated like culvert under road.
Completely internal furnace
Dry Back Scotch Marine
easy to clean and maintain, less costly, less efficient
Wet Back Scotch Marine
hard to clean and service due to limited access, more efficient, more costly
Fire Box
almost like Scotch Marine but fire box instead of corrugated. Can burn oil, gas, or solid
materials
Locomotive
Type of firetube used in trains. Variation of HRT, partially enclosed furnace
Vertical Fire Tube
Burner on bottom, could be on top in case of Fultons
Types of Water Tube Boilers
Straight Tube, Bent Tube, Flex tube, and Membrane tube
Water Tube Boiler
package boilers made in factory, add water/electric and ready to go. Process and power
generation.
Advantage of Water Tubes over Fire Tubes
WTB contains less water for same horsepower output of FTB. Most of energy is
contained in water not steam. Recovery rate is greater than fire tube because of less
water. (Less energy to heat smaller mass)
, 3 Types of Industrial Water Tubes
A, O, and D (most efficient, most common)
Electric Boiler
Electrode (spark plug) electrical arc or fusion, Resistance coil
1 boiler Horsepower
=746 watts = 33,478.8 Btu output / hr
=10 square feet of heating surface for conventional boiler
=5 square ft of heating surface for steam coil generator
=10 KW electric
Boiler trim
Valves and components directly attached to boiler necessary for it to run. (ex. water
column, gauge glass vent, bottom blowdown, relief valve, steam safety valve)
Boiler Accessories
components necessary for boiler to run but NOT attached to boiler (Feed pump, fuel
pump, condensate tank and pump, surge tank, Deaerator)
Stays
Support boiler in areas not supported by tubes. can be vertical, horizontal, and diagonal
Boiler Pass
where heat of combustion travels length of furnace or boiler tubes
Baffle
used in all boilers (fireside and waterside) to direct flow for greatest efficiency
How is piping measured vs. boiler tubes
piping is measured based on inside diameter, while boiler tubes are measured by
outside diameter
Dry Pipe
Pipe running along the top of steam space in which slots are cut in top or side for
purpose of admitting only dry steam to line. One has blank ending, other is connected to
steam outlet. Drain holes drilled on bottom.
What is the point of a dry pipe
to aid in removal of moisture from steam as it leaves the steam drum
what kind of stamp must a company posses to to weld on boilers
R stamp
ASME
American Society of Mechanical Engineers
According to ASME, how many valves must be on the main steam line of a high
pressure steam boiler?
2. Jurisdiction ends after second.
Longitudinal joint
Joint subject to greatest stress
Bottom Blowdown Valve
removes sludge and sediment, drains boiler for maintenance, located on bottom of mud
drum in WTB or bottom of boiler on Firetube
Breeching
exhaust pipe between boiler and chimney
Hot Water SUPPLY Boiler
water heater for domestic use
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