Medical Gas Systems Refresher Exam 2024–
Healthcare Facilities & Safety Compliance | Complete
refresher exam questions with correct answers.
1. According to NFPA 99-2024, what is the maximum allowable concentration of oil vapor in
medical air produced by compressor systems?
A. 0.1 mg/m³
B. 0.5 mg/m³
C. 1.0 mg/m³
D. 2.0 mg/m³
Answer: A
Rationale: NFPA 99-2024, Chapter 5, Section 5.1.3.5.1.7 limits oil vapor in medical air to 0.1
mg/m³. This extremely low limit prevents respiratory complications and ensures patient safety,
as oil vapors can cause serious lung damage.
2. Which CGA standard provides guidelines for the installation of medical gas central supply
systems?
A. CGA M-1
B. CGA G-4.1
C. CGA P-2.5
D. CGA S-1.3
Answer: A
Rationale: CGA M-1, "Standard for Medical Gas Supply Systems at Health Care Facilities,"
provides comprehensive installation guidelines for central supply systems, including source
equipment, piping, and safety requirements.
3. Under NFPA 99-2024, zone valves for medical gas systems must be installed in what type of
enclosure?
A. Locked cabinet only
B. Unlocked cabinet with break-glass front
C. Recessed box with hinged door
,D. Any of the above if properly labeled
Answer: C
Rationale: NFPA 99-2024, Chapter 5, Section 5.1.4.8.3 requires zone valves to be installed in
recessed boxes with hinged doors. This design provides protection while ensuring quick access
during emergencies.
4. What is the required color coding for carbon dioxide pipelines according to CGA standards?
A. Green
B. Yellow
C. Blue
D. Gray
Answer: D
Rationale: CGA G-4.1 specifies that carbon dioxide pipelines must be gray with "CARBON
DIOXIDE" or "CO2" clearly marked. This standardized color coding prevents dangerous cross-
connections.
5. According to NFPA 99-2024, master medical gas alarms must be located where?
A. In the engineering office
B. At the main nurses' station
C. In the mechanical room
D. In the security office
Answer: B
Rationale: NFPA 99-2024, Chapter 5, Section 5.1.9.3.1 requires master alarms to be located at
the main nurses' station or other continuously staffed area. This ensures immediate notification
of system issues.
6. During emergency procedures, what should be done first when a medical gas leak is detected
in a patient care area?
A. Evacuate all patients
B. Close the zone valve for that area
C. Call the fire department
, D. Shut off the main supply
Answer: B
Rationale: NFPA 99-2024 emergency protocols specify closing the zone valve first to isolate the
leak while maintaining service to other areas. This targeted approach minimizes disruption
while addressing the immediate hazard.
7. What is the required test pressure for medical gas piping systems per NFPA 99-2024?
A. 1.2 times working pressure
B. 1.5 times working pressure
C. 2.0 times working pressure
D. 2.5 times working pressure
Answer: B
Rationale: NFPA 99-2024, Chapter 5, Section 5.1.12.4.3.1 requires piping systems to be tested at
1.5 times the working pressure. This provides an adequate safety margin above normal
operating conditions.
8. CGA standards require that medical gas cylinders be secured to prevent falling when
exceeding what height?
A. 2 feet
B. 3 feet
C. 4 feet
D. 5 feet
Answer: C
Rationale: CGA requires cylinders exceeding 4 feet in height to be secured to prevent falling.
This prevents valve damage that could create dangerous projectile hazards.
9. According to NFPA 99-2024, how frequently must medical gas outlets be tested for flow rate?
A. Monthly
B. Quarterly
C. Annually
D. Every 3 years
Healthcare Facilities & Safety Compliance | Complete
refresher exam questions with correct answers.
1. According to NFPA 99-2024, what is the maximum allowable concentration of oil vapor in
medical air produced by compressor systems?
A. 0.1 mg/m³
B. 0.5 mg/m³
C. 1.0 mg/m³
D. 2.0 mg/m³
Answer: A
Rationale: NFPA 99-2024, Chapter 5, Section 5.1.3.5.1.7 limits oil vapor in medical air to 0.1
mg/m³. This extremely low limit prevents respiratory complications and ensures patient safety,
as oil vapors can cause serious lung damage.
2. Which CGA standard provides guidelines for the installation of medical gas central supply
systems?
A. CGA M-1
B. CGA G-4.1
C. CGA P-2.5
D. CGA S-1.3
Answer: A
Rationale: CGA M-1, "Standard for Medical Gas Supply Systems at Health Care Facilities,"
provides comprehensive installation guidelines for central supply systems, including source
equipment, piping, and safety requirements.
3. Under NFPA 99-2024, zone valves for medical gas systems must be installed in what type of
enclosure?
A. Locked cabinet only
B. Unlocked cabinet with break-glass front
C. Recessed box with hinged door
,D. Any of the above if properly labeled
Answer: C
Rationale: NFPA 99-2024, Chapter 5, Section 5.1.4.8.3 requires zone valves to be installed in
recessed boxes with hinged doors. This design provides protection while ensuring quick access
during emergencies.
4. What is the required color coding for carbon dioxide pipelines according to CGA standards?
A. Green
B. Yellow
C. Blue
D. Gray
Answer: D
Rationale: CGA G-4.1 specifies that carbon dioxide pipelines must be gray with "CARBON
DIOXIDE" or "CO2" clearly marked. This standardized color coding prevents dangerous cross-
connections.
5. According to NFPA 99-2024, master medical gas alarms must be located where?
A. In the engineering office
B. At the main nurses' station
C. In the mechanical room
D. In the security office
Answer: B
Rationale: NFPA 99-2024, Chapter 5, Section 5.1.9.3.1 requires master alarms to be located at
the main nurses' station or other continuously staffed area. This ensures immediate notification
of system issues.
6. During emergency procedures, what should be done first when a medical gas leak is detected
in a patient care area?
A. Evacuate all patients
B. Close the zone valve for that area
C. Call the fire department
, D. Shut off the main supply
Answer: B
Rationale: NFPA 99-2024 emergency protocols specify closing the zone valve first to isolate the
leak while maintaining service to other areas. This targeted approach minimizes disruption
while addressing the immediate hazard.
7. What is the required test pressure for medical gas piping systems per NFPA 99-2024?
A. 1.2 times working pressure
B. 1.5 times working pressure
C. 2.0 times working pressure
D. 2.5 times working pressure
Answer: B
Rationale: NFPA 99-2024, Chapter 5, Section 5.1.12.4.3.1 requires piping systems to be tested at
1.5 times the working pressure. This provides an adequate safety margin above normal
operating conditions.
8. CGA standards require that medical gas cylinders be secured to prevent falling when
exceeding what height?
A. 2 feet
B. 3 feet
C. 4 feet
D. 5 feet
Answer: C
Rationale: CGA requires cylinders exceeding 4 feet in height to be secured to prevent falling.
This prevents valve damage that could create dangerous projectile hazards.
9. According to NFPA 99-2024, how frequently must medical gas outlets be tested for flow rate?
A. Monthly
B. Quarterly
C. Annually
D. Every 3 years
