DC BOILER STATIONARY THIRD TESTING EXAM
2026|200 QUESTIONS AND ANSWERS GRADED
A+|100% VERIFIED|NEW UPDATE
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?
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?
Water In = Water Out
Makeup + Condensate Return = Evaporator + Blow Down
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:
D = 12 (C/d/h /.7854)
D = 12 (.037/60) = 3,603.60
D = .ft = 3,927
D = 3.603.,927 = 0.917647058
D = 0.957938963 * 12
D = 11.49 OR 12 "pipe
, The boiler steam line is 350 Feet long. During start-up the pipe is heated
From 60 F to 350 F. The 350 F. The pipe wills expand__7.92__inches
Due to the change in temperature
Equation:
(T 1 - T2) x L x .0000065
(350 - 60) x 350 x .0000065
290 x 350 x 12 x .0000065 = 7.92
A 12" pipe filled with water to a height of 250 feet will have a pressure of
_________at the bottom of the pipe?
Equation:
P = FT / 2.31
250 feet / 2.31 = 108.22
A "5" pipe filled with water to a height of 75 feet will have a pressure of
_________at
The bottom of the pipe?
Equation:
P = FT / 2.31
75 feet / 2.31 = 32.46
2026|200 QUESTIONS AND ANSWERS GRADED
A+|100% VERIFIED|NEW UPDATE
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?
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?
Water In = Water Out
Makeup + Condensate Return = Evaporator + Blow Down
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:
D = 12 (C/d/h /.7854)
D = 12 (.037/60) = 3,603.60
D = .ft = 3,927
D = 3.603.,927 = 0.917647058
D = 0.957938963 * 12
D = 11.49 OR 12 "pipe
, The boiler steam line is 350 Feet long. During start-up the pipe is heated
From 60 F to 350 F. The 350 F. The pipe wills expand__7.92__inches
Due to the change in temperature
Equation:
(T 1 - T2) x L x .0000065
(350 - 60) x 350 x .0000065
290 x 350 x 12 x .0000065 = 7.92
A 12" pipe filled with water to a height of 250 feet will have a pressure of
_________at the bottom of the pipe?
Equation:
P = FT / 2.31
250 feet / 2.31 = 108.22
A "5" pipe filled with water to a height of 75 feet will have a pressure of
_________at
The bottom of the pipe?
Equation:
P = FT / 2.31
75 feet / 2.31 = 32.46
