Rhode Island Master Pipefitter Exam
2026 – Brand-New Actual Exam with
Verified Answers
Rhode Island Master Pipefitter Practice Exam
Section 1: Code Knowledge and Regulations
1. According to the Rhode Island Plumbing Code, what is the minimum required size for a
building sewer serving a single-family dwelling?
a) 3 inches
b) 4 inches
(✓) c) 6 inches
d) 8 inches
2. The maximum allowable distance from the front of a fixture to the nearest edge of a
cleanout for a 4-inch drain line is:
a) 50 feet
b) 75 feet
(✓) c) 100 feet
d) 150 feet
3. Which of the following materials is NOT approved for underground drainage piping
within a building?
a) Cast Iron
b) PVC Schedule 40
(✓) c) ABS Schedule 20
d) No-Hub Cast Iron
4. The minimum required slope for a 4-inch diameter horizontal soil pipe is:
a) 1/16 inch per foot
(✓) b) 1/8 inch per foot
c) 1/4 inch per foot
d) 1/2 inch per foot
5. A Type B vent is used for:
a) Sewer gas ventilation
, (✓) b) Gas appliances
c) Storm drainage
d) Potable water lines
6. The primary purpose of an air gap in a plumbing system is to:
a) Increase water pressure
b) Vent sewer gases
(✓) c) Prevent backflow
d) Silence water hammer
7. According to the International Fuel Gas Code (IFGC), the minimum required working
clearance in front of an access panel for a gas appliance is:
a) 18 inches
b) 24 inches
(✓) c) 30 inches
d) 36 inches
8. A pressure relief valve on a hot water storage tank must be rated for a pressure:
a) Equal to the tank's working pressure
(✓) b) Not to exceed the tank's maximum working pressure (MAWP)
c) At least 25% higher than the tank's MAWP
d) The same as the street water pressure
9. The minimum size for a gas line serving a 120,000 BTU/hour furnace located 30 feet
from the meter is:
a) 1/2 inch
(✓) b) 3/4 inch
c) 1 inch
d) 1-1/4 inch
(Note: Exact answer requires consulting gas pipe sizing tables)
10. A backflow preventer is required on the water supply line to a:
a) Drinking fountain
b) Boiler make-up water line
c) Irrigation system with chemical injectors
(✓) d) All of the above
Section 2: Pipe Sizing and System Design
11. For a 20-story building, the primary factor in determining the size of the water main is:
a) Total fixture count
, b) Peak demand flow rate
(✓) c) Static pressure and pressure loss due to friction and elevation
d) The size of the city water main
12. When sizing a vent for a battery of fixtures, the diameter of the vent must be at least:
a) One-half the diameter of the drain it serves
(✓) b) One-half the diameter of the drain it serves, but not less than 1-1/4 inches
c) The same diameter as the largest drain in the battery
d) No less than 2 inches
13. The total fixture units for a branch drain serving three water closets (each 4 FU) and two
lavatories (each 1 FU) is:
a) 6 FU
b) 11 FU
(✓) c) 14 FU
d) 17 FU
14. A 3-inch drain, serving 40 fixture units on a slope of 1/4 inch per foot, has a capacity of
approximately:
a) 50 fixture units
(✓) b) 42 fixture units
c) 36 fixture units
d) 28 fixture units
15. The minimum size for the relief valve discharge pipe on a water heater is:
a) The same size as the valve outlet
(✓) b) One size larger than the valve outlet
c) 3/4 inch, regardless of valve size
d) Determined by the length of the pipe run
16. A 2-inch gas line, 50 feet long, can carry approximately how many BTU/hr with a 0.5"
w.c. pressure drop?
a) 100,000 BTU/hr
b) 275,000 BTU/hr
(✓) c) 420,000 BTU/hr
d) 550,000 BTU/hr
(Note: Exact answer requires consulting gas pipe sizing tables)
17. The purpose of a yoke vent is to:
a) Vent a single fixture trap
, b) Provide relief for a stack vent
(✓) c) Connect the vent stack to the soil stack to prevent pressure differentials
d) Vent a building sewer
18. The minimum size for a main vent stack in a residential building is:
a) 1-1/4 inches
b) 1-1/2 inches
(✓) c) 2 inches
d) 3 inches
19. When a drain line changes direction more than 45 degrees, what is required?
a) A reducer
b) An expansion joint
(✓) c) A cleanout
d) A backwater valve
20. The maximum developed length for a 1-1/4 inch tubular trap arm from a lavatory is:
a) 3 feet 6 inches
(✓) b) 5 feet
c) 6 feet
d) 8 feet
Section 3: Installation, Materials, and Methods
21. The minimum burial depth for a 4-inch building sewer of PVC pipe under a driveway is:
a) 12 inches
(✓) b) 18 inches
c) 24 inches
d) 36 inches
22. The proper method for supporting a 4-inch horizontal cast iron soil pipe is:
a) Every 5 feet
(✓) b) Every 10 feet
c) Every 15 feet
d) Only at joints
23. When brazing a joint in a copper line, the flux is used to:
a) Cool the joint quickly
b) Increase the melting point of the solder
(✓) c) Prevent oxidation and clean the metal surfaces
d) Seal the joint before heating
2026 – Brand-New Actual Exam with
Verified Answers
Rhode Island Master Pipefitter Practice Exam
Section 1: Code Knowledge and Regulations
1. According to the Rhode Island Plumbing Code, what is the minimum required size for a
building sewer serving a single-family dwelling?
a) 3 inches
b) 4 inches
(✓) c) 6 inches
d) 8 inches
2. The maximum allowable distance from the front of a fixture to the nearest edge of a
cleanout for a 4-inch drain line is:
a) 50 feet
b) 75 feet
(✓) c) 100 feet
d) 150 feet
3. Which of the following materials is NOT approved for underground drainage piping
within a building?
a) Cast Iron
b) PVC Schedule 40
(✓) c) ABS Schedule 20
d) No-Hub Cast Iron
4. The minimum required slope for a 4-inch diameter horizontal soil pipe is:
a) 1/16 inch per foot
(✓) b) 1/8 inch per foot
c) 1/4 inch per foot
d) 1/2 inch per foot
5. A Type B vent is used for:
a) Sewer gas ventilation
, (✓) b) Gas appliances
c) Storm drainage
d) Potable water lines
6. The primary purpose of an air gap in a plumbing system is to:
a) Increase water pressure
b) Vent sewer gases
(✓) c) Prevent backflow
d) Silence water hammer
7. According to the International Fuel Gas Code (IFGC), the minimum required working
clearance in front of an access panel for a gas appliance is:
a) 18 inches
b) 24 inches
(✓) c) 30 inches
d) 36 inches
8. A pressure relief valve on a hot water storage tank must be rated for a pressure:
a) Equal to the tank's working pressure
(✓) b) Not to exceed the tank's maximum working pressure (MAWP)
c) At least 25% higher than the tank's MAWP
d) The same as the street water pressure
9. The minimum size for a gas line serving a 120,000 BTU/hour furnace located 30 feet
from the meter is:
a) 1/2 inch
(✓) b) 3/4 inch
c) 1 inch
d) 1-1/4 inch
(Note: Exact answer requires consulting gas pipe sizing tables)
10. A backflow preventer is required on the water supply line to a:
a) Drinking fountain
b) Boiler make-up water line
c) Irrigation system with chemical injectors
(✓) d) All of the above
Section 2: Pipe Sizing and System Design
11. For a 20-story building, the primary factor in determining the size of the water main is:
a) Total fixture count
, b) Peak demand flow rate
(✓) c) Static pressure and pressure loss due to friction and elevation
d) The size of the city water main
12. When sizing a vent for a battery of fixtures, the diameter of the vent must be at least:
a) One-half the diameter of the drain it serves
(✓) b) One-half the diameter of the drain it serves, but not less than 1-1/4 inches
c) The same diameter as the largest drain in the battery
d) No less than 2 inches
13. The total fixture units for a branch drain serving three water closets (each 4 FU) and two
lavatories (each 1 FU) is:
a) 6 FU
b) 11 FU
(✓) c) 14 FU
d) 17 FU
14. A 3-inch drain, serving 40 fixture units on a slope of 1/4 inch per foot, has a capacity of
approximately:
a) 50 fixture units
(✓) b) 42 fixture units
c) 36 fixture units
d) 28 fixture units
15. The minimum size for the relief valve discharge pipe on a water heater is:
a) The same size as the valve outlet
(✓) b) One size larger than the valve outlet
c) 3/4 inch, regardless of valve size
d) Determined by the length of the pipe run
16. A 2-inch gas line, 50 feet long, can carry approximately how many BTU/hr with a 0.5"
w.c. pressure drop?
a) 100,000 BTU/hr
b) 275,000 BTU/hr
(✓) c) 420,000 BTU/hr
d) 550,000 BTU/hr
(Note: Exact answer requires consulting gas pipe sizing tables)
17. The purpose of a yoke vent is to:
a) Vent a single fixture trap
, b) Provide relief for a stack vent
(✓) c) Connect the vent stack to the soil stack to prevent pressure differentials
d) Vent a building sewer
18. The minimum size for a main vent stack in a residential building is:
a) 1-1/4 inches
b) 1-1/2 inches
(✓) c) 2 inches
d) 3 inches
19. When a drain line changes direction more than 45 degrees, what is required?
a) A reducer
b) An expansion joint
(✓) c) A cleanout
d) A backwater valve
20. The maximum developed length for a 1-1/4 inch tubular trap arm from a lavatory is:
a) 3 feet 6 inches
(✓) b) 5 feet
c) 6 feet
d) 8 feet
Section 3: Installation, Materials, and Methods
21. The minimum burial depth for a 4-inch building sewer of PVC pipe under a driveway is:
a) 12 inches
(✓) b) 18 inches
c) 24 inches
d) 36 inches
22. The proper method for supporting a 4-inch horizontal cast iron soil pipe is:
a) Every 5 feet
(✓) b) Every 10 feet
c) Every 15 feet
d) Only at joints
23. When brazing a joint in a copper line, the flux is used to:
a) Cool the joint quickly
b) Increase the melting point of the solder
(✓) c) Prevent oxidation and clean the metal surfaces
d) Seal the joint before heating
