Exam (elaborations)
3rd Grade Stationary Engineer 21 - 40
- Institution
- Ohio Stationary Steam Engineer License.
3rd Grade Stationary Engineer 21 - 40
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3rd Grade Stationary Engineer 21 - 401. what is a lap joint?
what is a butt joint?
what is a butt-strap joint? - ANS-LAP JOINT = when one plate overlaps the other and is
joined
BUTT JOINT = when two ends of the plate meet end to end and are joined
BUTT-STRAP JOINT = when two ends of the plate meet end to end and are joined by a
plate. (one plate is a single butt strap joint / two plates are a double butt strap joint)
at what pressure is the use of cast iron fittings permitted? - ANS-15 psi. or 250*F. Not to
exceed either one
describe a sectional boiler - ANS-the sectional headers are built up of vertical sections
or units. a sufficient number of sections are clamped together to form the desired boiler
size. these boilers can be erected in an existing building by carrying them in piece by
piece
is the longitudinal joint the strongest part of the boiler - ANS-NO! it is the strongest type
joint, but any joint is the weakest part of a boiler
two boilers are make of the same grade of steel, same thickness of plate and same type
of joints. one is 30" in diameter the other is 60" diameter. which will withstand the
greatest pressure and demonstrate your answer - ANS-the 30" boiler-it has less total
pressure on the shell.
DxDx.7854(1/4pi)xpsi
30x30x.7854x120 psi = 84,823 lbs. total pressure
60x60x.7854x120 psi = 339,292 lbs. total pressure
show your work on everything!
what are tube ligaments? - ANS-the area between the tube holes on the tube sheet
what is a fire tube boiler?
list 5 advantages
list 5 disadvantages
name 4 types - ANS-in a fire tube boiler, products of combustion pass through tubes or
flues surrounded by water.
, ADVANTAGES:
1) very little setting required
2) factory assembled for fast installation
3) low initial cost
4) can be made portable
5) compact
-----
DISADVANTAGES:
1) slow steamers
2) limited in pressure and capacity
3) liable to disastrous explosions because drums and joints are set over the fire
4) inefficient
5) inaccessible for inspection
-----
TYPES:
1) H.R.T.
2) locomotive
3) Scotch Marine
4) Vertical fire tube
what is a radiant type superheater?
what is a convection type superheater?
what is the third type of superheater? - ANS-A radiant superheater is set over the fire to
absorb radiant heat from the furnace by direct radiation
a convection superheater is placed in the gas passage of the furnace, usually between
the first and second pass. little to no radiation will reach this type
the third type is a combination of radiant and convection
what is a superheater?
what are the advantages of a superheater? - ANS-a super heater is a device used to
raise the temperature of steam without raising its pressure.
1) increases efficiency of the boiler
2) delivers dryer steam
3) dryer steam can be transmitted long distances with minimal heat loss
4) dryer steam reduces condensation and erosion
What is a water tube boiler?
list 5 advantages
list 5 disadvantages
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