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100+ Free SC Boiler Installation Practice Questions

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2026 Statistics

Key Facts: SC Boiler Installation Exam

50 Q

Official Exam Questions

PSI SC Commercial Contractor CIB updated 5/15/2025

70%

Passing Score (35 of 50)

PSI SC Commercial Contractor CIB updated 5/15/2025

3 hours

Time Allowed

PSI SC Commercial Contractor CIB updated 5/15/2025

USD 60

PSI Exam Fee

PSI SC Commercial Contractor CIB updated 5/15/2025

Open Book

Book Policy

PSI SC Commercial Contractor CIB updated 5/15/2025

South Carolina Boiler Installation Contractor Examination is the official CLB/PSI open-book exam: 50 questions, 70% (35 of 50), 3 hours, USD 60 (bulletin updated 5/15/2025). Official delivery is English.

Sample SC Boiler Installation Practice Questions

Try these sample questions to test your SC Boiler Installation exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under ASME BPVC Section IV service restrictions, a heating boiler is limited to which combination of steam pressure, hot-water pressure, and hot-water temperature?
A.15 psi steam, 160 psi water, and 250°F water
B.15 psi steam, 100 psi water, and 210°F water
C.50 psi steam, 160 psi water, and 250°F water
D.30 psi steam, 200 psi water, and 300°F water
Explanation: ASME Section IV, HG-101.1, restricts steam heating boilers to not more than 15 psi and hot-water heating or supply boilers to not more than 160 psi and/or 250°F at or near the boiler outlet. Service above those limits falls under ASME Section I power boilers. Those three numbers are the first lookup an installer uses to decide which code, stamp, and trim apply.
2Per the 2021 International Mechanical Code, controls and safety devices for boilers shall meet ASME CSD-1 or NFPA 85 at which fuel-input breakpoint?
A.ASME CSD-1 below 400,000 Btu/h and NFPA 85 at 400,000 Btu/h and above
B.ASME CSD-1 below 5,000,000 Btu/h and NFPA 85 at 5,000,000 Btu/h and above
C.ASME CSD-1 below 12,500,000 Btu/h and NFPA 85 at 12,500,000 Btu/h and above
D.ASME CSD-1 for all packaged boilers and NFPA 85 only for field-erected watertube units
Explanation: IMC 1004.1 requires ASME CSD-1 for boilers with fuel input ratings less than 12,500,000 Btu/h and NFPA 85 for inputs greater than or equal to 12,500,000 Btu/h. The same 12.5 MMBtu/h figure is the published lower scope of NFPA 85. Installers use it to decide which burner-management and interlock package is required.
3Unless otherwise approved, 2021 IMC working-clearance rules require passageways around all sides of a boiler to have an unobstructed width of not less than:
A.18 inches
B.24 inches
C.36 inches
D.12 inches
Explanation: IMC 1004.3 requires an unobstructed passageway of not less than 18 inches around all sides of boilers so gauges, valves, and service points remain accessible. Separate, larger top clearances in Table 1004.3.1 apply above the boiler and do not reduce the 18-inch side aisle.
4Under the 2021 IMC, how must a hot-water boiler be protected from overpressure?
A.With a safety relief valve
B.With an expansion tank only
C.With a temperature-limit control only
D.With a spring-pop steam safety valve set at 15 psi
Explanation: IMC 1006.2 requires every hot-water boiler to be protected with a safety relief valve. Steam boilers use a safety valve (1006.1); hot-water boilers use a safety relief valve that reseats on water service. An expansion tank and a temperature limit are also required, but they do not replace the relief valve.
5Which 2021 IMC statement about expansion tanks on hot-water heating systems is correct?
A.An expansion tank is required only when the boiler input exceeds 400,000 Btu/h
B.Each boiler in a multiple-boiler plant must have its own expansion tank
C.An expansion tank shall be installed in every hot-water system, and multiple-boiler plants need not less than one tank
D.Open-type tanks are prohibited; only ASME-stamped bladder tanks may be used
Explanation: IMC 1009.1 requires an expansion tank in every hot-water system and not less than one tank for multiple-boiler installations. Tanks may be closed or open type and must be rated for system pressure. The only listed exception is the collector loop of a drain-back solar system.
6South Carolina’s Boiler Installation contractor classification may be obtained without the technical examination if a qualified individual of the company holds which credential?
A.An ASME “U” stamp or a National Board “VR” stamp only
B.An ASME “H” stamp or a manufacturer’s UL boiler listing
C.An ASME “S” stamp or a National Board of Boiler and Pressure Vessel Inspectors “R” stamp
D.A current South Carolina master plumber license
Explanation: The South Carolina Contractor’s Licensing Board allows the Boiler Installation classification by passing the technical exam or by holding an ASME “S” (power boiler) stamp or an NBBPVI “R” (repair) stamp for a qualified individual of the company. Those stamps demonstrate Code construction or repair capability that the Board accepts in lieu of the trade exam.
7Per 2021 IMC Table 1004.3.1, what is the minimum clearance from the top of a boiler that has a manhole on top to the ceiling or other overhead obstruction, unless a greater clearance in that table applies?
A.18 inches
B.2 feet
C.3 feet
D.7 feet
Explanation: Table 1004.3.1 requires 3 feet above boilers with manholes on top so the cover can be lifted and a person can enter. Boilers without top manholes generally need 2 feet, and large high-pressure steam boilers can require 7 feet. Always take the greater applicable row in the table.
8A high-pressure steam boiler has a steam-generating capacity of 6,200 pounds per hour. What minimum top clearance does 2021 IMC Table 1004.3.1 require from the top of the boiler to the ceiling?
A.2 feet
B.3 feet
C.5 feet
D.7 feet
Explanation: Table 1004.3.1 requires 7 feet above high-pressure steam boilers whose steam-generating capacity exceeds 5,000 pounds per hour. The same 7-foot row also applies when heating surface exceeds 1,000 square feet or input exceeds 5,000,000 Btu/h. A 6,200 lb/h unit is over the 5,000 lb/h breakpoint.
9Which 2021 IMC valve rule applies to boiler supply and return connections?
A.Every boiler or modular boiler shall have a shutoff valve in the supply and return piping, except that shutoff valves are not required in a system having a single low-pressure steam boiler
B.Shutoff valves are prohibited on any steam boiler return
C.Only the supply connection needs a shutoff valve
D.Multiple boilers may share one pair of isolation valves on the common header
Explanation: IMC 1005.1 requires a shutoff valve in the supply and return of every boiler or modular boiler, and individual valves on each unit in a multiple-boiler plant. The only exception is a system that has a single low-pressure steam boiler. Isolation lets one boiler be serviced without draining the entire plant.
10The 2021 IMC low-water-cutoff requirement for steam and hot-water boilers has which exception?
A.A low-water cutoff is not required for coil-type and water-tube-type boilers that require forced circulation and are protected with a flow-sensing control
B.Hot-water boilers under 1,000,000 Btu/h need no water-level or flow protection
C.A probe-type alarm may replace the cutoff on any packaged boiler
D.Electric boilers never require a low-water cutoff
Explanation: IMC 1007.1 requires a low-water cutoff on steam and hot-water boilers, with one exception: coil-type and water-tube boilers that need forced circulation and that are protected by a flow-sensing control. Those boilers overheat from loss of flow, not from a falling drum level, so proving circulation is the correct interlock.

About the SC Boiler Installation Exam

The South Carolina Boiler Installation Contractor Examination is the official CLB classification examination administered by PSI. The official exam has 50 scored questions. Passing is 70% (35 of 50) in 3 hours. The examination is open book. PSI lists USD 60 (South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025). Install, repair, and service boilers and boiler piping including the boiler machinery and dryer rolls. An ASME S stamp or NBBPVI R stamp can substitute for this technical examination if licensure requirements are otherwise met. All commercial general and mechanical contractor candidates must pass the Business Management and Law for Commercial Contractor Examination in addition to this technical examination. LLR charges a separate USD 350 license application fee. This bank is an English-language MCQ study adaptation. It does not replace required trade experience, board approval, financial statements or bonds, or the official examination.

Assessment

Open-book computer-based multiple-choice. Allowed references are listed in the South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025.

Time Limit

3 hours

Passing Score

70% (35 of 50)

Exam Fee

USD 60 (PSI Services LLC (for the South Carolina Contractor's Licensing Board))

SC Boiler Installation Exam Content Outline

20%

Code Compliance

Code Compliance (10 items)

24%

Boilers - Low Pressure

Boilers - Low Pressure (12 items)

16%

Boilers - High Pressure

Boilers - High Pressure (8 items)

10%

Boilers - Steam Traps

Boilers - Steam Traps (5 items)

10%

Boilers - Safety

Boilers - Safety (5 items)

8%

Piping

Piping (4 items)

12%

Welding

Welding (6 items)

How to Pass the SC Boiler Installation Exam

What You Need to Know

  • Passing score: 70% (35 of 50)
  • Assessment: Open-book computer-based multiple-choice. Allowed references are listed in the South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025.
  • Time limit: 3 hours
  • Exam fee: USD 60

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

SC Boiler Installation Study Tips from Top Performers

1Distribute study time to the official PSI content outline (bulletin updated 5/15/2025)
2Use only the PSI-listed references for this classification
3Temporary tabs such as Post-it notes are prohibited in the PSI center
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the South Carolina Boiler Installation Contractor Examination?

The official PSI examination has 50 scored questions. Passing is 70% (35 of 50) within 3 hours (South Carolina Commercial Contractor Candidate Information Bulletin updated 5/15/2025).

How much does the SC Boiler Installation exam cost?

PSI lists USD 60 for this examination. The South Carolina Contractor's Licensing Board charges a separate USD 350 license application fee.

Is the SC Boiler Installation exam open book?

Yes. PSI lists the commercial contractor examinations as open book. Candidates may bring the PSI-listed references for this classification. Temporary tabs such as Post-it notes are prohibited.

Can an ASME or National Board stamp replace this technical examination?

Yes. To qualify for the boiler installation subclassification, a person must pass this technical examination or hold the ASME S stamp or the NBBPVI R stamp and meet the remaining licensure requirements.