ASSE 6020 MEDICAL GAS SYSTEMS
INSPECTOR PRACTICE EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
| INSTANT DOWNLOAD PDF
1. Which color identifies medical oxygen piping in the United States?
A. Green
B. White
C. Yellow
D. Blue
Answer: B. White
Rationale: White is the standard indicator color for medical oxygen piping per
NFPA and CGA standards.
2. What is the maximum allowable leakage rate for medical gas piping fittings?
A. 1 cubic inch per hour
B. 5 cubic inches per minute
C. No detectable leakage
D. 10 cubic inches per hour
Answer: C. No detectable leakage
Rationale: Medical gas systems must not have any detectable leakage to ensure
patient safety and system integrity.
,3. NFPA 99 classifies medical gas systems under which chapter?
A. Chapter 1
B. Chapter 5
C. Chapter 10
D. Chapter 8
Answer: B. Chapter 5
Rationale: Chapter 5 of NFPA 99 covers performance requirements including
medical gas and vacuum systems.
4. What is the purpose of a zone valve in a medical gas system?
A. To shut off gas to a specific area
B. To filter contaminants
C. To increase pressure
D. To provide backup supply
Answer: A. To shut off gas to a specific area
Rationale: Zone valves isolate portions of piping in case of emergency or
maintenance without shutting down the entire system.
5. Which standard addresses medical gas pipeline materials?
A. NFPA 54
B. ASME B31.3
C. ANSI/ASHRAE 62.1
D. NFPA 99
Answer: D. NFPA 99
Rationale: NFPA 99 provides requirements for materials of construction,
installation, and testing of medical gas pipelines.
6. What testing is required after installation of medical gas piping?
, A. Visual inspection only
B. Hydrostatic or air pressure test
C. No testing required
D. Flow rate test only
Answer: B. Hydrostatic or air pressure test
Rationale: Piping must be pressure tested to verify integrity and absence of leaks.
7. Medical vacuum systems typically operate at what pressure range?
A. 0 to 5 psi
B. -20 to -100 mm Hg
C. 50 to 100 psi
D. 10 to 20 psi
Answer: B. -20 to -100 mm Hg
Rationale: Vacuum systems are negative pressure systems measured in mm Hg
rather than psi.
8. Who is authorized to perform brazing on medical gas piping?
A. Any installer
B. Certified brazing technician
C. Facility maintenance staff
D. Anyone with a torch
Answer: B. Certified brazing technician
Rationale: Brazing requires certification to ensure proper joint integrity and
compliance.
9. What is expressed as psi in medical gas systems?
A. Flow rate
B. Pressure
C. Temperature
INSPECTOR PRACTICE EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
| INSTANT DOWNLOAD PDF
1. Which color identifies medical oxygen piping in the United States?
A. Green
B. White
C. Yellow
D. Blue
Answer: B. White
Rationale: White is the standard indicator color for medical oxygen piping per
NFPA and CGA standards.
2. What is the maximum allowable leakage rate for medical gas piping fittings?
A. 1 cubic inch per hour
B. 5 cubic inches per minute
C. No detectable leakage
D. 10 cubic inches per hour
Answer: C. No detectable leakage
Rationale: Medical gas systems must not have any detectable leakage to ensure
patient safety and system integrity.
,3. NFPA 99 classifies medical gas systems under which chapter?
A. Chapter 1
B. Chapter 5
C. Chapter 10
D. Chapter 8
Answer: B. Chapter 5
Rationale: Chapter 5 of NFPA 99 covers performance requirements including
medical gas and vacuum systems.
4. What is the purpose of a zone valve in a medical gas system?
A. To shut off gas to a specific area
B. To filter contaminants
C. To increase pressure
D. To provide backup supply
Answer: A. To shut off gas to a specific area
Rationale: Zone valves isolate portions of piping in case of emergency or
maintenance without shutting down the entire system.
5. Which standard addresses medical gas pipeline materials?
A. NFPA 54
B. ASME B31.3
C. ANSI/ASHRAE 62.1
D. NFPA 99
Answer: D. NFPA 99
Rationale: NFPA 99 provides requirements for materials of construction,
installation, and testing of medical gas pipelines.
6. What testing is required after installation of medical gas piping?
, A. Visual inspection only
B. Hydrostatic or air pressure test
C. No testing required
D. Flow rate test only
Answer: B. Hydrostatic or air pressure test
Rationale: Piping must be pressure tested to verify integrity and absence of leaks.
7. Medical vacuum systems typically operate at what pressure range?
A. 0 to 5 psi
B. -20 to -100 mm Hg
C. 50 to 100 psi
D. 10 to 20 psi
Answer: B. -20 to -100 mm Hg
Rationale: Vacuum systems are negative pressure systems measured in mm Hg
rather than psi.
8. Who is authorized to perform brazing on medical gas piping?
A. Any installer
B. Certified brazing technician
C. Facility maintenance staff
D. Anyone with a torch
Answer: B. Certified brazing technician
Rationale: Brazing requires certification to ensure proper joint integrity and
compliance.
9. What is expressed as psi in medical gas systems?
A. Flow rate
B. Pressure
C. Temperature
