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2023 update DC BOILER/STATIONARY Third testing questions with complete solutions
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2023 update DC BOILER/STATIONARY Third testing questions with complete solutions 2023 update DC BOILER/STATIONARY Third testing questions with complete solutions 2023 update DC BOILER/STATIONARY Third testing questions with complete solutions 2023 update DC BOILER/STATIONARY Third testing ...

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  • December 17, 2023
  • 29
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

Subjects

  • dc boiler
  • 2023 update dc boilerstationary third testing qu
  • dc boilerstationary third testing qu
  • stationary third testing qu

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  • 2023 update DC BOILER/STATIONARY Third testing qu
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2023 update DC BOILER/STATIONARY Third testing
questions with complete solutions


The component in which liquid vapor by absorbing heat is called? - ANSWER-Evaporator



Select the best answer electrical grounding method? - ANSWER-Metal stake drive 8 foot into the
ground.



A _____ valve should be used for throttling purpose? - ANSWER-Globe



What is the acceptable range for residual sodium sulfite in the boiler maintain? - ANSWER-30-70



What is the BTU content of a gallon of #4? - ANSWER-146,000



What does a zeolite water softener system use as a means of regeneration? - ANSWER-Brine



What are the 4 steps for a Zeolite Rejuvenation water softener process? - ANSWER-Back wash

Backwash, brine, rinse, service



Where is medium temperature is liquid found? - ANSWER-Condenser



Where is high temperature vapor found? - ANSWER-At the discharge of the compressor or condenser



What stays are used to support the burner chamber in a scotch marine boiler? - ANSWER-Diagonal Stays



What type of safety valve is this? - ANSWER-( Full) Crosby nozzle-type safety valve. Page 365 BOG



What type of safety valve is this? - ANSWER-( Full) Crosby nozzle-type safety valve. Page 365 BOG

, 2023 update DC BOILER/STATIONARY Third testing
questions with complete solutions

Where do you found superheat reading? - ANSWER-Take suction line pressure

Cross reference using a P/T Chart

Get tail coil Temperature

Subtract cross references temperature from tail coil temperature

Result will be superheat



Name the wire that connects all component of a system to a physical ground or water pipe? - ANSWER-
Grounding Electrode Conductor



Where do get sub-cooling reading? - ANSWER-Take liquid line pressure

Cross reference to temperature using a P/T Chart

Get liquid line temperature

Subtract actual temperature from cross referenced temperature

Result is sub-cooling



On the boilers that have both Quick opening and Screw type blow down valves, the Quick opening valve
must be located? - ANSWER-Closest to the boiler and followed by the screw type valve



High pressure boilers equipped with Quick opening and Screw type valves are blown down how? -
ANSWER-By opening the Quick opening valve first and closing it Last. Page 403 BOG



ASME Code defines a slow opening valve as what? - ANSWER-One requiring at least 5 full 360 degree
turns between full open and close position. Page 374



A 300 Horsepower boiler operating at 100psi has an average load of 75% with 80% condensate return
and 5% blow down. The treatment provides a chemical which costs $8.75 per gallon, and will treat 600
gallon. Find the amount of the chemical needed for the day period, and the cost of the chemical for a 30
days period? - ANSWER-Water In = Water Out

Makeup + Condensate Return = Evaporator + Blow Down

, 2023 update DC BOILER/STATIONARY Third testing
questions with complete solutions


Average Evaporator Rate = 300 x 34.5 pph x .75% load = 7762, 50 pph



1 Month + .8( 7762.50 pph) = 7762.50 pph + 0500 m



1 Month + 6210 pph = 7762.50 pph + .0500 m

-6210 -6210

1 Month = 1552.5 pph + .0500



.9500 m = 1552.5 pph

.9500m .9500



1Month = 1,634.21 pph



Gallons per Month = 1634..33 x 24 x 30 = 141, 252.24 gallons per month

Chemical needed = 141,252.24 gallon / 600 gallon = 235, 40 gallon



Cost per month = 235, 40 gallon x 8.75 = $2,059.75



During a 24 hours operation how often should you check the water level? - ANSWER-Once per shift



A 15 psi steam boiler produces 8000 pound of steam per hour. The

Minimum pipe size for the pipe leaving the boiler is___12__inches.

(Density is 0.037 lbs/ft3)

Equation: - ANSWER-D = 12 (C/d/h /.7854)

D = 12 (.037/60) = 3,603.60

D = .ft = 3,927

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