ASSE 6020 Medical Gas Systems
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4. The medical vacuum system intake must be protected by:
a) A pressure regulator
b) A check valve
c) A bacterial filter
d) A muffler
Rationale: Bacterial filters prevent contaminants from entering the
vacuum pump.
5. What is the standard for cleaning medical gas piping for oxygen
service?
a) ASTM B819
b) ASTM B88
c) ASTM B819
d) ASTM F1387
, Rationale: ASTM B819 specifies copper tubing cleaned for oxygen
service.
6. A category 1 medical gas system is used in areas where:
a) Equipment failure is acceptable
b) Only dental gases are supplied
c) System failure could cause patient injury or death
d) Gas is not critical to patient care
Rationale: Category 1 serves critical care areas where continuous
gas service is essential.
7. The purpose of a line regulator is to:
a) Increase line pressure
b) Reduce and control system pressure
c) Measure flow rate
d) Maintain temperature
Rationale: Line regulators reduce high source pressure to a
controlled system pressure.
8. The pressure relief valve in a gas system prevents:
a) Gas contamination
b) Cross-connections
c) Over-pressurization
d) Flow reversal
Rationale: Pressure relief valves protect systems from dangerous
over-pressurization.
,9. What is the minimum test duration for a 50 psi pressure test on
medical gas piping?
a) 10 minutes
b) 24 hours
c) 12 hours
d) 1 hour
Rationale: NFPA 99 requires 24-hour testing at 50 psi to verify
system integrity.
10. What color identifies nitrous oxide pipelines?
a) Blue
b) Blue
c) Green
d) Yellow
Rationale: Nitrous oxide is identified by blue per NFPA 99 color
codes.
11. What component allows isolation of a floor or wing in a facility?
a) Source valve
b) Riser valve
c) Zone valve
d) Service valve
Rationale: Riser valves isolate sections of piping for maintenance or
emergencies.
12. Where must shutoff valves be accessible?
, a) In the ceiling space
b) Behind equipment
c) Readily accessible to staff
d) In the main supply room
Rationale: NFPA 99 mandates all shutoff valves must be easily
accessible during emergencies.
13. The primary concern when inspecting a cross-connection is:
a) Pressure imbalance
b) Gas purity and patient safety
c) Equipment performance
d) Maintenance costs
Rationale: Cross-connections can cause gas contamination leading to
life-threatening hazards.
14. What is the minimum test pressure for oxygen piping?
a) 100 psi
b) 150 psi
c) 200 psi
d) 250 psi
Rationale: Oxygen piping systems are tested at 150 psi as per NFPA
99.
15. A Category 3 medical gas system serves:
a) Operating rooms
b) ICUs
Inspector Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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4. The medical vacuum system intake must be protected by:
a) A pressure regulator
b) A check valve
c) A bacterial filter
d) A muffler
Rationale: Bacterial filters prevent contaminants from entering the
vacuum pump.
5. What is the standard for cleaning medical gas piping for oxygen
service?
a) ASTM B819
b) ASTM B88
c) ASTM B819
d) ASTM F1387
, Rationale: ASTM B819 specifies copper tubing cleaned for oxygen
service.
6. A category 1 medical gas system is used in areas where:
a) Equipment failure is acceptable
b) Only dental gases are supplied
c) System failure could cause patient injury or death
d) Gas is not critical to patient care
Rationale: Category 1 serves critical care areas where continuous
gas service is essential.
7. The purpose of a line regulator is to:
a) Increase line pressure
b) Reduce and control system pressure
c) Measure flow rate
d) Maintain temperature
Rationale: Line regulators reduce high source pressure to a
controlled system pressure.
8. The pressure relief valve in a gas system prevents:
a) Gas contamination
b) Cross-connections
c) Over-pressurization
d) Flow reversal
Rationale: Pressure relief valves protect systems from dangerous
over-pressurization.
,9. What is the minimum test duration for a 50 psi pressure test on
medical gas piping?
a) 10 minutes
b) 24 hours
c) 12 hours
d) 1 hour
Rationale: NFPA 99 requires 24-hour testing at 50 psi to verify
system integrity.
10. What color identifies nitrous oxide pipelines?
a) Blue
b) Blue
c) Green
d) Yellow
Rationale: Nitrous oxide is identified by blue per NFPA 99 color
codes.
11. What component allows isolation of a floor or wing in a facility?
a) Source valve
b) Riser valve
c) Zone valve
d) Service valve
Rationale: Riser valves isolate sections of piping for maintenance or
emergencies.
12. Where must shutoff valves be accessible?
, a) In the ceiling space
b) Behind equipment
c) Readily accessible to staff
d) In the main supply room
Rationale: NFPA 99 mandates all shutoff valves must be easily
accessible during emergencies.
13. The primary concern when inspecting a cross-connection is:
a) Pressure imbalance
b) Gas purity and patient safety
c) Equipment performance
d) Maintenance costs
Rationale: Cross-connections can cause gas contamination leading to
life-threatening hazards.
14. What is the minimum test pressure for oxygen piping?
a) 100 psi
b) 150 psi
c) 200 psi
d) 250 psi
Rationale: Oxygen piping systems are tested at 150 psi as per NFPA
99.
15. A Category 3 medical gas system serves:
a) Operating rooms
b) ICUs
