2026/2027 MASSACHUSETTS JOURNEYMAN
PIPEFITTER LINCENSING EXAM WITH ACTUAL
QUESTIONS AND 100% CORRECT VERIFIED
ANSWERS (LATEST UPDATE !!!)
Topic Area 1: Boiler Safety Valves and Controls
1. A pipefitter is installing a safety valve on a high-pressure steam boiler. The valve inlet is 3
inches and the set pressure is 20 psig. What type of inlet connection is required?
A) Threaded
B) Flanged or welded
C) Socket-welded
D) Compression
Answer: B
Safety valves over 3 inches and over 15 psig require flanged or welded inlet connections. Threaded
connections are not permitted for these sizes and pressures.
2. A steam heating boiler has pumped condensate returns. How many low water cut-offs are
required?
A) One
B) Two
pg. 1 SUCCESS!!!
,C) Three
D) None
Answer: B
Two low water cut-offs are required on a steam heating boiler when the boiler has pumped
condensate returns. This redundancy prevents low-water conditions that could damage the boiler.
3. A pipefitter is installing a low water cut-off on a hot water heating boiler. Where is the
acceptable installation location?
A) Below the lowest safe permissible water level
B) Any place above the lowest safe permissible water level and before the first stop valve
C) Only on the return line
D) Only on the supply line
Answer: B
A low water cut-off on a hot water heating boiler may be installed any place above the lowest safe
permissible water level and before the first stop valve.
4. What is the purpose of a Hartford steam loop?
A) To increase steam pressure
B) To reduce water temperature
C) To prevent water in each boiler from being forced out below the safe water level
D) To measure steam flow
Answer: C
The return pipe connections of each boiler supplying a gravity return steam heating system shall
form a loop (Hartford loop) so that water in each boiler cannot be forced out below the safe water
level.
5. A pressure gauge on a high-pressure boiler must have a dial graduated to no less than how
many times the pressure at which the safety valve is set?
A) 0.5 times
B) 1.0 times
pg. 2 SUCCESS!!!
, C) 1.5 times
D) 2.0 times
Answer: C
The dial of the pressure gauge on a high-pressure boiler shall be graduated to no less than 1.5 times
the pressure at which the safety valve is set.
Topic Area 2: Piping Materials and Installation
6. A pipefitter is installing black iron gas pipe in a crawlspace. What is the maximum support
spacing for 1/2-inch pipe?
A) 4 feet
B) 6 feet
C) 8 feet
D) 10 feet
Answer: B
Gas piping support spacing varies by pipe size. For 1/2-inch pipe, the maximum spacing is typically
6 feet. Larger pipes allow greater spacing.
7. What is the minimum size of a residential natural gas service line from the street to the
building in Massachusetts?
A) 1/2 inch
B) 3/4 inch
C) 1 inch
D) 1-1/4 inch
Answer: B
Massachusetts Code 248 CMR 4.00 requires a 3/4 inch minimum for single-family residential gas
service to ensure adequate volume for typical appliances (furnace, water heater, range).
8. A flexible gas appliance connector shall not exceed what maximum length?
A) 3 feet
B) 4 feet
pg. 3 SUCCESS!!!
PIPEFITTER LINCENSING EXAM WITH ACTUAL
QUESTIONS AND 100% CORRECT VERIFIED
ANSWERS (LATEST UPDATE !!!)
Topic Area 1: Boiler Safety Valves and Controls
1. A pipefitter is installing a safety valve on a high-pressure steam boiler. The valve inlet is 3
inches and the set pressure is 20 psig. What type of inlet connection is required?
A) Threaded
B) Flanged or welded
C) Socket-welded
D) Compression
Answer: B
Safety valves over 3 inches and over 15 psig require flanged or welded inlet connections. Threaded
connections are not permitted for these sizes and pressures.
2. A steam heating boiler has pumped condensate returns. How many low water cut-offs are
required?
A) One
B) Two
pg. 1 SUCCESS!!!
,C) Three
D) None
Answer: B
Two low water cut-offs are required on a steam heating boiler when the boiler has pumped
condensate returns. This redundancy prevents low-water conditions that could damage the boiler.
3. A pipefitter is installing a low water cut-off on a hot water heating boiler. Where is the
acceptable installation location?
A) Below the lowest safe permissible water level
B) Any place above the lowest safe permissible water level and before the first stop valve
C) Only on the return line
D) Only on the supply line
Answer: B
A low water cut-off on a hot water heating boiler may be installed any place above the lowest safe
permissible water level and before the first stop valve.
4. What is the purpose of a Hartford steam loop?
A) To increase steam pressure
B) To reduce water temperature
C) To prevent water in each boiler from being forced out below the safe water level
D) To measure steam flow
Answer: C
The return pipe connections of each boiler supplying a gravity return steam heating system shall
form a loop (Hartford loop) so that water in each boiler cannot be forced out below the safe water
level.
5. A pressure gauge on a high-pressure boiler must have a dial graduated to no less than how
many times the pressure at which the safety valve is set?
A) 0.5 times
B) 1.0 times
pg. 2 SUCCESS!!!
, C) 1.5 times
D) 2.0 times
Answer: C
The dial of the pressure gauge on a high-pressure boiler shall be graduated to no less than 1.5 times
the pressure at which the safety valve is set.
Topic Area 2: Piping Materials and Installation
6. A pipefitter is installing black iron gas pipe in a crawlspace. What is the maximum support
spacing for 1/2-inch pipe?
A) 4 feet
B) 6 feet
C) 8 feet
D) 10 feet
Answer: B
Gas piping support spacing varies by pipe size. For 1/2-inch pipe, the maximum spacing is typically
6 feet. Larger pipes allow greater spacing.
7. What is the minimum size of a residential natural gas service line from the street to the
building in Massachusetts?
A) 1/2 inch
B) 3/4 inch
C) 1 inch
D) 1-1/4 inch
Answer: B
Massachusetts Code 248 CMR 4.00 requires a 3/4 inch minimum for single-family residential gas
service to ensure adequate volume for typical appliances (furnace, water heater, range).
8. A flexible gas appliance connector shall not exceed what maximum length?
A) 3 feet
B) 4 feet
pg. 3 SUCCESS!!!
