MN STATE SPECIAL BOILER LICENSE
STUDY GUIDE QUESTIONS WITH
SOLUTIONS!!
ASME - ANSWERAmerican Society of Mechanical Engineers
NBIC - ANSWERNational Board Inspection Code
High-pressure boiler - ANSWERSteam boiler > 15psi, liquid boilers operating > 160
psi OR > 250 degrees Fahrenheit
_________ safety valve required on a steam boiler - ANSWERSpring loaded
How many safety valves minimum are needed when the heating surface of a high-
pressure boiler exceeds 500 square feet - ANSWER2
Maximum size of safety valve on a low-pressure boiler is - ANSWER4 1/2 inch
A high-pressure steam boiler is required to have ______ valves on the main steam
line. - ANSWER2
10 square feet is equivalent to _____ boiler horsepower for conventional boilers -
ANSWER1
Minimum size pipe to be used to connect a water column to high pressure boilers -
ANSWER1 inch
Water Columns of steel must be used if pressure is over _____ - ANSWER350 psi
Minimum size drain required on a water column is - ANSWER3/4 inch
If water gauge glass becomes inoperable on steam boiler, the boiler could
temporarily operate using - ANSWERgauge-cocks (try-cocks)
Dial on a steam gauge on a low-pressure boiler must be graduated from ________
times the maximum allowable working pressure - ANSWER1 1/2 to 2
Minimum size of pipe diameter that may be used to attach a steam gauge to a steam
boiler - ANSWER1/4 inch
Low-pressure boiler - ANSWERSteam boilers at or below 15 psi, Liquid boilers
operating at or below 160 psi AND 250 degrees Fahrenheit
Minimum safety valve size on a regular boiler (high or low pressure) - ANSWER3/4
inch
, Minimum safety valve size on a MINITURE boiler - ANSWER1/2 inch
Safety valves on steam boilers should be manually tested - ANSWERonce a month
Safety valves on a low-pressure boiler should be manually tested -
ANSWERquarterly
When 2 or more steam valves are located on a steam header line, there must be a
______ located between the 2 valves - ANSWERdrain valve
When 2 valves are used on bottom blow-down line of a steam boiler, the
___________ is located closest to the boiler - ANSWERquick-opening valve
On a slow-opening blow-down valve, it is required to have ________ turns from fully
closed to fully open - ANSWER5 360 degree
Temperature of water leaving the blow-down tank and entering a sanitary sewer
system must not exceed _______ degrees Fahrenheit - ANSWER150
Blow-off valves for pressures in excess of 200 psi working pressure must be made of
- ANSWERsteel
High pressure boilers require _______ means of feeding water into the boiler -
ANSWER2
What type of plant can Special license work at? - ANSWERany type of plant
What type of plant can a Grade C license work at? - ANSWERLow-pressure steam
or hot water
What type of plant can a Grade B license work at? - ANSWERHigh-pressure or low-
pressure steam or hot water
What type of plant can a Grade A license work at? - ANSWERAny plant with steam
engines/turbines
Sensible heat - ANSWERCauses temperature to increase
Latent heat - ANSWERCauses a physical change in stage or phase with no change
in temperature
Heating surface - ANSWERboiler metal that has heat of combustion on 1 side and
water/steam on the other
Requirements to start a fire - ANSWERFuel, oxygen, and ignition
Draft - ANSWER-difference in pressure between 2 points that causes air and other
gases to flow
-draft control regulates amount of air entering the furnace
STUDY GUIDE QUESTIONS WITH
SOLUTIONS!!
ASME - ANSWERAmerican Society of Mechanical Engineers
NBIC - ANSWERNational Board Inspection Code
High-pressure boiler - ANSWERSteam boiler > 15psi, liquid boilers operating > 160
psi OR > 250 degrees Fahrenheit
_________ safety valve required on a steam boiler - ANSWERSpring loaded
How many safety valves minimum are needed when the heating surface of a high-
pressure boiler exceeds 500 square feet - ANSWER2
Maximum size of safety valve on a low-pressure boiler is - ANSWER4 1/2 inch
A high-pressure steam boiler is required to have ______ valves on the main steam
line. - ANSWER2
10 square feet is equivalent to _____ boiler horsepower for conventional boilers -
ANSWER1
Minimum size pipe to be used to connect a water column to high pressure boilers -
ANSWER1 inch
Water Columns of steel must be used if pressure is over _____ - ANSWER350 psi
Minimum size drain required on a water column is - ANSWER3/4 inch
If water gauge glass becomes inoperable on steam boiler, the boiler could
temporarily operate using - ANSWERgauge-cocks (try-cocks)
Dial on a steam gauge on a low-pressure boiler must be graduated from ________
times the maximum allowable working pressure - ANSWER1 1/2 to 2
Minimum size of pipe diameter that may be used to attach a steam gauge to a steam
boiler - ANSWER1/4 inch
Low-pressure boiler - ANSWERSteam boilers at or below 15 psi, Liquid boilers
operating at or below 160 psi AND 250 degrees Fahrenheit
Minimum safety valve size on a regular boiler (high or low pressure) - ANSWER3/4
inch
, Minimum safety valve size on a MINITURE boiler - ANSWER1/2 inch
Safety valves on steam boilers should be manually tested - ANSWERonce a month
Safety valves on a low-pressure boiler should be manually tested -
ANSWERquarterly
When 2 or more steam valves are located on a steam header line, there must be a
______ located between the 2 valves - ANSWERdrain valve
When 2 valves are used on bottom blow-down line of a steam boiler, the
___________ is located closest to the boiler - ANSWERquick-opening valve
On a slow-opening blow-down valve, it is required to have ________ turns from fully
closed to fully open - ANSWER5 360 degree
Temperature of water leaving the blow-down tank and entering a sanitary sewer
system must not exceed _______ degrees Fahrenheit - ANSWER150
Blow-off valves for pressures in excess of 200 psi working pressure must be made of
- ANSWERsteel
High pressure boilers require _______ means of feeding water into the boiler -
ANSWER2
What type of plant can Special license work at? - ANSWERany type of plant
What type of plant can a Grade C license work at? - ANSWERLow-pressure steam
or hot water
What type of plant can a Grade B license work at? - ANSWERHigh-pressure or low-
pressure steam or hot water
What type of plant can a Grade A license work at? - ANSWERAny plant with steam
engines/turbines
Sensible heat - ANSWERCauses temperature to increase
Latent heat - ANSWERCauses a physical change in stage or phase with no change
in temperature
Heating surface - ANSWERboiler metal that has heat of combustion on 1 side and
water/steam on the other
Requirements to start a fire - ANSWERFuel, oxygen, and ignition
Draft - ANSWER-difference in pressure between 2 points that causes air and other
gases to flow
-draft control regulates amount of air entering the furnace
