CLASS 5 BOILER ACTUAL EXAM SCRIPT 2025/2026
QUESTIONS WITH ANSWERS GRADED A+
✔✔If you hold a Class IV or Class V license, you are allowed to supervise .... - ✔✔class
VI
✔✔Under B31.5, A1 and B1 refrigerant is classified by its toxicity and flammability. -
✔✔True
✔✔How many automatic low-water fuel cutoff devices shall there be on each
automatically fired high-pressure steam boilers? - ✔✔Two
✔✔Which code section covers Power Piping? - ✔✔B31.1
✔✔How far apart are oxygen and acetylene bottles to be stored? - ✔✔20 feet
✔✔Agriculturally used air tanks on a farm are exempt. - ✔✔True
✔✔What is the heat affected zone? - ✔✔The area adjacent to the weld
✔✔Total hours of welding on pressure piping must you have to apply for a Class B
license? - ✔✔2000 hours
✔✔Journeymen Plumbers are exempt from having a Class V license to install or
replace, by non-welded means, a potable water heater, not used for space heating up to
180 gallons, 210 degrees, 150 psi and 75000 BTU - ✔✔TRUE
✔✔What method of testing is used on a root pass? - ✔✔PT liquid penetrant and MT
magnetic particle
✔✔How many gallons in a cubic foot? - ✔✔7.48
✔✔What is the min. and max. percentage of operating pressure used to test pipe
covered under B31.5? - ✔✔Minimum 110%
Maximum 130%
✔✔Determine the pressure at the bottom of a water column.... - ✔✔Multiply the height
of the column by .434
height x .434
✔✔When unbolting a flange in an isolated system, you MUST: - ✔✔Start by unbolting
the side away from you first
,✔✔The Boiler Inspection Report , outlining the work to be done, must be posted .... -
✔✔Within sight of the boiler being worked on.
✔✔Which code section covers Process Piping? - ✔✔B31.1
✔✔Which code section covers Refrigeration? - ✔✔B31.5
✔✔Which code section covers Building Services Piping? - ✔✔B31.9
✔✔Hangers for pipe larger than 2 1/2" must be adjustable ... - ✔✔True
✔✔An automatic pressure relief device actuated by the static pressure upstream of the
valve and characterized by full opening POP ACTION. It is used for gas and vapor
service.... - ✔✔SAFETY VALVE...
✔✔An automatic pressure relieving device actuated by the static pressure upstream of
the valve which opens further with the increase in pressure over the opening pressure.
It is used primarily for fluid service... - ✔✔RELIEF VALVE pressure relief valve
✔✔An automatic pressure relieving device suitable for use either as a safety valve OR
relief valve, depending on the application... - ✔✔SAFETY RELIEF VALVE
✔✔Each pressure vessel installed in Oregon must be equipped with an ASME
approved safety relieving device set to relieve at or below the .... - ✔✔Maximum
allowable working pressure
✔✔Can you put a safety on a system of pressure vessels? - ✔✔yes
✔✔**Can you put a shutoff valve between the pressure vessel and the safety? - ✔✔NO
✔✔For a low pressure boiler what is the highest amount of psig that is allowed? - ✔✔15
psi
✔✔What is the intended purpose of the discharge piping on a safety relief valve? -
✔✔To discharge over pressurization of the relief valve to a safe point of discharge
✔✔For high pressure boilers how many safety relief valves should be put on a vessel
with more than 1100 kw of power? - ✔✔2
✔✔What is the BTU requirement for boilers that have to meet ASME CSD - 1 codes? -
✔✔1 - 12,500,000 BTU
✔✔Name 3 types of steam traps... - ✔✔F and T float and Thermostatic
,Thermo disc
Bucket trap
Inverted bucket trap
✔✔What is the purpose of a steam trap? - ✔✔To release condensate, non-
condensable, to allow air to go thru and to keep steam in
✔✔The dead weight of the pipe, fittings, valves, pipe contents and occasional loads like
ice and snow are all components of figuring out.... - ✔✔Pipe hanger loads
✔✔Stringer beads are deposited without oscillation and are parallel.... - ✔✔True
✔✔In a globe valve with the flow going in the bottom, the pressure is against the disc....
- ✔✔True
✔✔You could use PVC for building services under B31.9 - ✔✔True
✔✔The Governor appoints the Boiler Board - ✔✔True
✔✔On return piping you must provide a method to clean at or near the boiler... -
✔✔True
✔✔Who appoints the Chief Inspector? - ✔✔The Director of the Department of
Consumer and Business Services 480.565
✔✔On an isometric dwg, the line with an arrow in each end is the: - ✔✔Dimension Line
✔✔A 20' lenght of 4" schd 40 pipe weighs how much empty and how much full of
water? - ✔✔Empty - 245 lbs
Full - 350 lbs
✔✔In E11018, the 110 stands for: - ✔✔Tensile Strength
✔✔**How many threads on a 2 1/2" pipe? - ✔✔11 1/2
✔✔On base metal 3/16" - 1/2", from 350 - 750 degrees, the maximum amount of weld
reinforcement allowed is... - ✔✔5/32" . B31.1 table 127.42
✔✔When socket welding you must pull the pipe out of the fitting... - ✔✔1/16" 31.1-127.3
✔✔What fuels a Class C fire? - ✔✔Burning electrical
✔✔What extinguishing agent is used on electrical fires? - ✔✔CO2
, ✔✔Used pipe, under ASME code B31.9, can be reused if it has been cleaned and
inspected. - ✔✔TRUE
✔✔If the welder has been certified on 6" pipe in the 6G position he can weld on 1: water
wall tube. - ✔✔TRUE
✔✔Pool Boilers are exempt if..... - ✔✔the burners are wired in series with the pump.
918.225.300 (6)
✔✔Refrigerant or A/C pressure vessels containing ______ or more must have a permit.
- ✔✔3 cu. ft.
✔✔You multiply the height of the water in a tank by .434 to obtain the psi. - ✔✔TRUE
✔✔The difference in volume btwn a 2" pipe and a 4" pipe is.... - ✔✔4 times
✔✔A stop valve cannot be installed btwn the boiler and the relief valve. - ✔✔TRUE
✔✔What is the volume of a tank with a 36" diameter and 60" in length? - ✔✔35.3 cu. ft.
pi x r2 x h
find radius of base/calculate area of base/find height of cylinder/mult. area by height
✔✔The PI designation stands for what type of material? - ✔✔Carbon steel pipe
✔✔On a single steam boiler installation with a stop valve on the supply line, you MUST
have one on the feed water line... - ✔✔TRUE
✔✔On a multiple steam boiler installation you SHALL (will) have a stop valve on each
supply and feed water line. - ✔✔TRUE
✔✔Which code covers steam heating boilers? - ✔✔ASME B31.1
✔✔Boiler blow off valves must have a minimum 100 psi rating. - ✔✔TRUE B31.1-
122.1.7(a.4)
✔✔The "E" in E7018 stands for arc welding Electrode - ✔✔TRUE
✔✔Blowdown piping for systems over 100 psig must be what schedule pipe? -
✔✔Schedule 80 B31.1-122.1.3 (A.3)
✔✔Which Code deals with the highest pressure? - ✔✔B31.1 - POWER PIPING
QUESTIONS WITH ANSWERS GRADED A+
✔✔If you hold a Class IV or Class V license, you are allowed to supervise .... - ✔✔class
VI
✔✔Under B31.5, A1 and B1 refrigerant is classified by its toxicity and flammability. -
✔✔True
✔✔How many automatic low-water fuel cutoff devices shall there be on each
automatically fired high-pressure steam boilers? - ✔✔Two
✔✔Which code section covers Power Piping? - ✔✔B31.1
✔✔How far apart are oxygen and acetylene bottles to be stored? - ✔✔20 feet
✔✔Agriculturally used air tanks on a farm are exempt. - ✔✔True
✔✔What is the heat affected zone? - ✔✔The area adjacent to the weld
✔✔Total hours of welding on pressure piping must you have to apply for a Class B
license? - ✔✔2000 hours
✔✔Journeymen Plumbers are exempt from having a Class V license to install or
replace, by non-welded means, a potable water heater, not used for space heating up to
180 gallons, 210 degrees, 150 psi and 75000 BTU - ✔✔TRUE
✔✔What method of testing is used on a root pass? - ✔✔PT liquid penetrant and MT
magnetic particle
✔✔How many gallons in a cubic foot? - ✔✔7.48
✔✔What is the min. and max. percentage of operating pressure used to test pipe
covered under B31.5? - ✔✔Minimum 110%
Maximum 130%
✔✔Determine the pressure at the bottom of a water column.... - ✔✔Multiply the height
of the column by .434
height x .434
✔✔When unbolting a flange in an isolated system, you MUST: - ✔✔Start by unbolting
the side away from you first
,✔✔The Boiler Inspection Report , outlining the work to be done, must be posted .... -
✔✔Within sight of the boiler being worked on.
✔✔Which code section covers Process Piping? - ✔✔B31.1
✔✔Which code section covers Refrigeration? - ✔✔B31.5
✔✔Which code section covers Building Services Piping? - ✔✔B31.9
✔✔Hangers for pipe larger than 2 1/2" must be adjustable ... - ✔✔True
✔✔An automatic pressure relief device actuated by the static pressure upstream of the
valve and characterized by full opening POP ACTION. It is used for gas and vapor
service.... - ✔✔SAFETY VALVE...
✔✔An automatic pressure relieving device actuated by the static pressure upstream of
the valve which opens further with the increase in pressure over the opening pressure.
It is used primarily for fluid service... - ✔✔RELIEF VALVE pressure relief valve
✔✔An automatic pressure relieving device suitable for use either as a safety valve OR
relief valve, depending on the application... - ✔✔SAFETY RELIEF VALVE
✔✔Each pressure vessel installed in Oregon must be equipped with an ASME
approved safety relieving device set to relieve at or below the .... - ✔✔Maximum
allowable working pressure
✔✔Can you put a safety on a system of pressure vessels? - ✔✔yes
✔✔**Can you put a shutoff valve between the pressure vessel and the safety? - ✔✔NO
✔✔For a low pressure boiler what is the highest amount of psig that is allowed? - ✔✔15
psi
✔✔What is the intended purpose of the discharge piping on a safety relief valve? -
✔✔To discharge over pressurization of the relief valve to a safe point of discharge
✔✔For high pressure boilers how many safety relief valves should be put on a vessel
with more than 1100 kw of power? - ✔✔2
✔✔What is the BTU requirement for boilers that have to meet ASME CSD - 1 codes? -
✔✔1 - 12,500,000 BTU
✔✔Name 3 types of steam traps... - ✔✔F and T float and Thermostatic
,Thermo disc
Bucket trap
Inverted bucket trap
✔✔What is the purpose of a steam trap? - ✔✔To release condensate, non-
condensable, to allow air to go thru and to keep steam in
✔✔The dead weight of the pipe, fittings, valves, pipe contents and occasional loads like
ice and snow are all components of figuring out.... - ✔✔Pipe hanger loads
✔✔Stringer beads are deposited without oscillation and are parallel.... - ✔✔True
✔✔In a globe valve with the flow going in the bottom, the pressure is against the disc....
- ✔✔True
✔✔You could use PVC for building services under B31.9 - ✔✔True
✔✔The Governor appoints the Boiler Board - ✔✔True
✔✔On return piping you must provide a method to clean at or near the boiler... -
✔✔True
✔✔Who appoints the Chief Inspector? - ✔✔The Director of the Department of
Consumer and Business Services 480.565
✔✔On an isometric dwg, the line with an arrow in each end is the: - ✔✔Dimension Line
✔✔A 20' lenght of 4" schd 40 pipe weighs how much empty and how much full of
water? - ✔✔Empty - 245 lbs
Full - 350 lbs
✔✔In E11018, the 110 stands for: - ✔✔Tensile Strength
✔✔**How many threads on a 2 1/2" pipe? - ✔✔11 1/2
✔✔On base metal 3/16" - 1/2", from 350 - 750 degrees, the maximum amount of weld
reinforcement allowed is... - ✔✔5/32" . B31.1 table 127.42
✔✔When socket welding you must pull the pipe out of the fitting... - ✔✔1/16" 31.1-127.3
✔✔What fuels a Class C fire? - ✔✔Burning electrical
✔✔What extinguishing agent is used on electrical fires? - ✔✔CO2
, ✔✔Used pipe, under ASME code B31.9, can be reused if it has been cleaned and
inspected. - ✔✔TRUE
✔✔If the welder has been certified on 6" pipe in the 6G position he can weld on 1: water
wall tube. - ✔✔TRUE
✔✔Pool Boilers are exempt if..... - ✔✔the burners are wired in series with the pump.
918.225.300 (6)
✔✔Refrigerant or A/C pressure vessels containing ______ or more must have a permit.
- ✔✔3 cu. ft.
✔✔You multiply the height of the water in a tank by .434 to obtain the psi. - ✔✔TRUE
✔✔The difference in volume btwn a 2" pipe and a 4" pipe is.... - ✔✔4 times
✔✔A stop valve cannot be installed btwn the boiler and the relief valve. - ✔✔TRUE
✔✔What is the volume of a tank with a 36" diameter and 60" in length? - ✔✔35.3 cu. ft.
pi x r2 x h
find radius of base/calculate area of base/find height of cylinder/mult. area by height
✔✔The PI designation stands for what type of material? - ✔✔Carbon steel pipe
✔✔On a single steam boiler installation with a stop valve on the supply line, you MUST
have one on the feed water line... - ✔✔TRUE
✔✔On a multiple steam boiler installation you SHALL (will) have a stop valve on each
supply and feed water line. - ✔✔TRUE
✔✔Which code covers steam heating boilers? - ✔✔ASME B31.1
✔✔Boiler blow off valves must have a minimum 100 psi rating. - ✔✔TRUE B31.1-
122.1.7(a.4)
✔✔The "E" in E7018 stands for arc welding Electrode - ✔✔TRUE
✔✔Blowdown piping for systems over 100 psig must be what schedule pipe? -
✔✔Schedule 80 B31.1-122.1.3 (A.3)
✔✔Which Code deals with the highest pressure? - ✔✔B31.1 - POWER PIPING
