DC Third testing 2026
The component in which liquid Evaporator
vapor by absorbing heat is called?
Select the best answer electrical Metal stake drive 8 foot into the ground.
grounding method?
A _____ valve should be used for Globe
throttling purpose?
What is the acceptable range for 30-70
residual sodium sulfite in the boiler
maintain?
What is the BTU content of a 146,000
gallon of #4?
What does a zeolite water softener Brine
system use as a means of
regeneration?
,DC Third testing 2026
What are the 4 steps for a Zeolite Back wash
Rejuvenation water softener Backwash, brine, rinse, service
process?
Where is medium temperature is Condenser
liquid found?
Where is high temperature vapor At the discharge of the compressor or condenser
found?
What stays are used to support the Diagonal Stays
burner chamber in a scotch marine
boiler?
What type of safety valve is this? ( Full) Crosby nozzle-type safety valve. Page
365 BOG
What type of safety valve is this? ( Full) Crosby nozzle-type safety valve. Page
365 BOG
,DC Third testing 2026
Where do you found superheat Take suction line pressure
reading? 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 Grounding Electrode Conductor
component of a system to a
physical ground or water pipe?
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 Closest to the boiler and followed by the screw
Quick opening and Screw type type valve
blow down valves, the Quick
opening valve must be located?
High pressure boilers equipped By opening the Quick opening valve first and
with Quick opening and Screw closing it Last. Page 403 BOG
type valves are blown down how?
ASME Code defines a slow One requiring at least 5 full 360 degree turns
opening valve as what? between full open and close position. Page 374
,DC Third testing 2026
A 300 Horsepower boiler operating Water In = Water Out
at 100psi has an average load of Makeup + Condensate Return = Evaporator +
75% with 80% condensate return Blow Down
and 5% blow down. The treatment
provides a chemical which costs Average Evaporator Rate = 300 x 34.5 pph x
$8.75 per gallon, and will treat 600 .75% load = 7762, 50 pph
gallon. Find the amount of the
chemical needed for the day 1 Month + .8( 7762.50 pph) = 7762.50 pph +
period, and the cost of the chemical 0500 m
for a 30 days period?
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 Once per shift
often should you check the water
level?
,DC Third testing 2026
A 15 psi steam boiler produces D = 12 (C/d/h /.7854)
8000 pound of steam per hour. The D = 12 (.037/60) = 3,603.60
Minimum pipe size for the pipe D = .ft = 3,927
leaving the boiler is___12__inches. D = 3.603.,927 = 0.917647058
(Density is 0.037 lbs/ft3) D = 0.957938963 * 12
Equation: D = 11.49 OR 12 "pipe
The boiler steam line is 350 Feet (T 1 - T2) x L x .0000065
long. During start-up the pipe is (350 - 60) x 350 x .0000065
heated 290 x 350 x 12 x .0000065 = 7.92
From 60 F to 350 F. The 350 F.
The pipe wills
expand__7.92__inches
Due to the change in temperature
Equation:
A 12" pipe filled with water to a 250 feet / 2.31 = 108.22
height of 250 feet will have a
pressure of
_________at the bottom of the
pipe?
Equation:
P = FT / 2.31
, DC Third testing 2026
A "5" pipe filled with water to a 75 feet / 2.31 = 32.46
height of 75 feet will have a
pressure of
_________at
The bottom of the pipe?
Equation:
P = FT / 2.31
What is the flow rate, in gallons GPM = V X D²
per minute, of water flowing 0.4085
through a 8' pipe
At a velocity of 7 feet per second? GPM = 7 x (8 x 8)
0.4085
GPM = 448
0.4085
GPM = 1096.69 gpm
What is the flow rate, in gallons GPM = V X D²
per minute, of water flowing 0.4085
through a 4' pipe At a velocity of
12 feet per second? GPM = 12 x (4 x 4)
0.4085
GPM = 192
0.4085
GPM = 470.01 gpm
The component in which liquid Evaporator
vapor by absorbing heat is called?
Select the best answer electrical Metal stake drive 8 foot into the ground.
grounding method?
A _____ valve should be used for Globe
throttling purpose?
What is the acceptable range for 30-70
residual sodium sulfite in the boiler
maintain?
What is the BTU content of a 146,000
gallon of #4?
What does a zeolite water softener Brine
system use as a means of
regeneration?
,DC Third testing 2026
What are the 4 steps for a Zeolite Back wash
Rejuvenation water softener Backwash, brine, rinse, service
process?
Where is medium temperature is Condenser
liquid found?
Where is high temperature vapor At the discharge of the compressor or condenser
found?
What stays are used to support the Diagonal Stays
burner chamber in a scotch marine
boiler?
What type of safety valve is this? ( Full) Crosby nozzle-type safety valve. Page
365 BOG
What type of safety valve is this? ( Full) Crosby nozzle-type safety valve. Page
365 BOG
,DC Third testing 2026
Where do you found superheat Take suction line pressure
reading? 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 Grounding Electrode Conductor
component of a system to a
physical ground or water pipe?
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 Closest to the boiler and followed by the screw
Quick opening and Screw type type valve
blow down valves, the Quick
opening valve must be located?
High pressure boilers equipped By opening the Quick opening valve first and
with Quick opening and Screw closing it Last. Page 403 BOG
type valves are blown down how?
ASME Code defines a slow One requiring at least 5 full 360 degree turns
opening valve as what? between full open and close position. Page 374
,DC Third testing 2026
A 300 Horsepower boiler operating Water In = Water Out
at 100psi has an average load of Makeup + Condensate Return = Evaporator +
75% with 80% condensate return Blow Down
and 5% blow down. The treatment
provides a chemical which costs Average Evaporator Rate = 300 x 34.5 pph x
$8.75 per gallon, and will treat 600 .75% load = 7762, 50 pph
gallon. Find the amount of the
chemical needed for the day 1 Month + .8( 7762.50 pph) = 7762.50 pph +
period, and the cost of the chemical 0500 m
for a 30 days period?
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 Once per shift
often should you check the water
level?
,DC Third testing 2026
A 15 psi steam boiler produces D = 12 (C/d/h /.7854)
8000 pound of steam per hour. The D = 12 (.037/60) = 3,603.60
Minimum pipe size for the pipe D = .ft = 3,927
leaving the boiler is___12__inches. D = 3.603.,927 = 0.917647058
(Density is 0.037 lbs/ft3) D = 0.957938963 * 12
Equation: D = 11.49 OR 12 "pipe
The boiler steam line is 350 Feet (T 1 - T2) x L x .0000065
long. During start-up the pipe is (350 - 60) x 350 x .0000065
heated 290 x 350 x 12 x .0000065 = 7.92
From 60 F to 350 F. The 350 F.
The pipe wills
expand__7.92__inches
Due to the change in temperature
Equation:
A 12" pipe filled with water to a 250 feet / 2.31 = 108.22
height of 250 feet will have a
pressure of
_________at the bottom of the
pipe?
Equation:
P = FT / 2.31
, DC Third testing 2026
A "5" pipe filled with water to a 75 feet / 2.31 = 32.46
height of 75 feet will have a
pressure of
_________at
The bottom of the pipe?
Equation:
P = FT / 2.31
What is the flow rate, in gallons GPM = V X D²
per minute, of water flowing 0.4085
through a 8' pipe
At a velocity of 7 feet per second? GPM = 7 x (8 x 8)
0.4085
GPM = 448
0.4085
GPM = 1096.69 gpm
What is the flow rate, in gallons GPM = V X D²
per minute, of water flowing 0.4085
through a 4' pipe At a velocity of
12 feet per second? GPM = 12 x (4 x 4)
0.4085
GPM = 192
0.4085
GPM = 470.01 gpm
