Exam (elaborations)
3rd Grade Stationary Engineer 60-79
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- 3rd Grade Engineer.
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- 3rd Grade Engineer.
3rd Grade Stationary Engineer 60-79
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3rd Grade Stationary Engineer 60-79define purging
name two types - ANS-purging = the forced removal of combustibles from the firebox.
1) pre-purge = before the pilot is lit
2) post-purge = after the combustion cycle
draw a picture of low pressure gas piping to a burner - ANS-must include:
1) main gas shut off
2) valve
3) a tee to the pilot w/shut-off valve and pilot solenoid
4) manual reset valve
5) gas pressure switch
6) PRV with vent
7) main gas solenoid
8) mixing chamber
9) blower pushing through the venturi
10) into the burner
how do you pipe an oil supply line from the tank to the burner? - ANS-1) oil flows from
the storage tank through the suction strainer
2) steam or electric driven pump
3) relief valve
4) steam or electric heater
5) discharge strainer
6) low oil pressure switch
7) firing rate control valve
8) low oil temperature switch
9) safety shut off valve
10) high oil pressure switch
11) on to the burner or tank return
(manual isolation valves and bypasses must be installed for all devices so the boiler
stays on line during repair)
How is density of smoke measured?
how do you use a Ringlemann Chart? - ANS-With an opacimeter or Ringlemann chart.
1) hold at arms length looking through the hole in the chart
2) observers line of sight should be a right angle to the direction of smoke travel
3) observer should be no less than 100ft or no more than 1/4 mile from the stack
, 4) observer should not look toward bright sunlight
5) the background immediately behind the top of the stack should be free of buildings or
other dark objects
6) compare the shade or density of the smoke seen through the hole to the
corresponding shade on the chart
name three types of nozzles used in oil burners.
explain where secondary air is admitted. - ANS-nozzles:
1) rotary atomizing
2) steam atomizing
3) air atomizing
4) pressure atomizing secondary air is admitted around the tip.
the gas meter for your boiler malfunctions and you have to shut off all gas. how can you
keep your boiler on line? - ANS-if you have an alternate fuel, hook up a propane bottle
with a regulator to the pilot
under what conditions must fuel oil be heated?
how is it heated?
how hot is it heated? - ANS-#4/5/6 oils need to be heated
steam and electricity can be used to heat oil
oil should not be heated to more than 10*F below its flash point. (rule of thumb is)
#4 - 135*F
#5 - 185*F
#6 - 220*F
what are pulsations?
how would you correct this condition? - ANS-pulsations = when the flame leaves the
burner tip and then returns. this may become so severe that the combustion consists of
a series of small explosions.
how to correct:
pulverized coal or oil furnace = the proper air-fuel mixture.
gas furnace = increase the draft
what are seven heat losses in a boiler? - ANS-1) moisture in the air
2) moisture in the fuel
3) moisture formed in the burning of hydrogen
4) incomplete combustion
5) unburned carbon in the ash
6) heat carried away in dry flue gasses
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