Page 1 of 159
Michigan Hydronic Heating, Cooling & Process
Piping Exam ACTUAL QUESTIONS AND ANSWERS
LATEST UPDATE THIS YEAR
Michigan Hydronic Heating, Cooling & Process Piping Exam, covering the 2015 Michigan Mechanical
Code (based on IMC), ASME B31.9 (building services piping), ASME B31.5 (refrigeration piping), hydronic
system design, boiler/piping installation, expansion tanks, circulators, water treatment, process piping,
safety, and Michigan-specific licensing/regulations.
Question 1
What is the minimum required clearance from combustible material for a single-wall metal vent
connector for a gas-fired boiler in Michigan?
A) 3 inches
B) 6 inches
C) 9 inches
D) 12 inches
Correct Answer: B
Rationale: Michigan Mechanical Code (IMC) requires a minimum 6-inch clearance for single-wall metal
vent connectors from combustible materials unless reduced by a listed shield.
, Page 2 of 159
Question 2
ASME B31.9 is the applicable code for what type of piping in Michigan?
A) Chemical process piping
B) Building services piping (heating, cooling, water)
C) Refrigerant piping
D) Natural gas transmission lines
Correct Answer: B
Rationale: ASME B31.9 covers building services piping including hydronic heating, cooling, and domestic
water systems within buildings.
Question 3
In a hydronic system, the expansion tank is typically located on the:
A) Boiler supply line
B) Boiler return line
, Page 3 of 159
C) Suction side of the circulator
D) Discharge side of the circulator
Correct Answer: C
Rationale: Locating the expansion tank on the suction side of the circulator (point of no pressure
change) ensures stable system pressure.
Question 4
What is the maximum allowable temperature for a low-pressure hot water heating boiler?
A) 150°F
B) 200°F
C) 250°F
D) 300°F
Correct Answer: C
Rationale: ASME Section IV limits low-pressure hot water boilers to a maximum operating temperature
of 250°F.
, Page 4 of 159
Question 5
What is the minimum required size for an expansion tank on a closed hydronic system based on?
A) Boiler horsepower
B) Total water volume and temperature rise
C) Pipe diameter
D) Number of circulators
Correct Answer: B
Rationale: Expansion tank sizing is determined by the system water volume, temperature range (ΔT),
and fill pressure.
Question 6
Which type of pipe is prohibited for use in hydronic heating systems in Michigan?
A) Type L copper
B) PEX
Michigan Hydronic Heating, Cooling & Process
Piping Exam ACTUAL QUESTIONS AND ANSWERS
LATEST UPDATE THIS YEAR
Michigan Hydronic Heating, Cooling & Process Piping Exam, covering the 2015 Michigan Mechanical
Code (based on IMC), ASME B31.9 (building services piping), ASME B31.5 (refrigeration piping), hydronic
system design, boiler/piping installation, expansion tanks, circulators, water treatment, process piping,
safety, and Michigan-specific licensing/regulations.
Question 1
What is the minimum required clearance from combustible material for a single-wall metal vent
connector for a gas-fired boiler in Michigan?
A) 3 inches
B) 6 inches
C) 9 inches
D) 12 inches
Correct Answer: B
Rationale: Michigan Mechanical Code (IMC) requires a minimum 6-inch clearance for single-wall metal
vent connectors from combustible materials unless reduced by a listed shield.
, Page 2 of 159
Question 2
ASME B31.9 is the applicable code for what type of piping in Michigan?
A) Chemical process piping
B) Building services piping (heating, cooling, water)
C) Refrigerant piping
D) Natural gas transmission lines
Correct Answer: B
Rationale: ASME B31.9 covers building services piping including hydronic heating, cooling, and domestic
water systems within buildings.
Question 3
In a hydronic system, the expansion tank is typically located on the:
A) Boiler supply line
B) Boiler return line
, Page 3 of 159
C) Suction side of the circulator
D) Discharge side of the circulator
Correct Answer: C
Rationale: Locating the expansion tank on the suction side of the circulator (point of no pressure
change) ensures stable system pressure.
Question 4
What is the maximum allowable temperature for a low-pressure hot water heating boiler?
A) 150°F
B) 200°F
C) 250°F
D) 300°F
Correct Answer: C
Rationale: ASME Section IV limits low-pressure hot water boilers to a maximum operating temperature
of 250°F.
, Page 4 of 159
Question 5
What is the minimum required size for an expansion tank on a closed hydronic system based on?
A) Boiler horsepower
B) Total water volume and temperature rise
C) Pipe diameter
D) Number of circulators
Correct Answer: B
Rationale: Expansion tank sizing is determined by the system water volume, temperature range (ΔT),
and fill pressure.
Question 6
Which type of pipe is prohibited for use in hydronic heating systems in Michigan?
A) Type L copper
B) PEX
