MEDICAL GAS INSTALLER LICENSE EXAM Q d d d d d
UESTIONS AND CORRECT ANSWERS (VERIFI d d d d
ED ANSWERS) PLUS RATIONALES 2026 Q&
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A | INSTANT DOWNLOAD PDF
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1. What is the standard that governs the installation of medical gas and
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vacuum systems? d
A. NFPA 58
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B. NFPA 99
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C. NFPA 70
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D. ASME B31.1
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B. NFPA 99
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NFPA 99 is the Health Care Facilities Code and sets the standards for m
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edical gas and vacuum systems.
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2. Which type of brazing alloy is required for medical gas piping?
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A. Lead-based alloy
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B. Aluminum-based alloy
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C. Copper-phosphorus alloy without flux
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D. Tin-silver alloy with flux
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C. Copper-phosphorus alloy without flux
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Flux is not allowed in medical gas systems to prevent contamination.
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Copper-phosphorus alloy is acceptable for joining copper pipes. d d d d d d d
, 3. Before brazing, what must be done to purge the pipe?
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A. Fill with compressed air
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B. Fill with oxygen
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C. Purge with nitrogen
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D. Fill with helium
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C. Purge with nitrogen
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Nitrogen purging is required during brazing to prevent internal oxidation a
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nd contamination of the pipe.
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4. What is the minimum pressure test required for medical gas piping
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after installation? d
A. 50 psig
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B. 100 psig
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C. 150 psig
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D. 150% of the system pressure
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D. 150% of the system pressure
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NFPA 99 requires pressure testing at 1.5 times the operating pressure to ens
d d d d d d d d d d d d
ure the system’s integrity.
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5. What type of piping material is approved for medical gas installations?
d d d d d d d d d d
A. PVC
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B. Black steel
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C. Copper Type K cleaned for oxygen service
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D. Galvanized steel
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C. Copper Type K cleaned for oxygen service
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Only Type K copper that has been cleaned and capped is suitable for m
d d d d d d d d d d d d d
edical gas systems to ensure purity and strength.
d d d d d d d
6. How should copper medical gas pipe be identified?
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,A. By size only
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B. With red color coding
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C. With manufacturer’s logo
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D. By a label stating “OXY” and a green color band
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D. By a label stating “OXY” and a green color band
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Medical gas piping must be clearly labeled with the gas name and color cod
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e to prevent cross-connection and ensure safety.
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7. What color is used to identify oxygen piping?d d d d d d d
A. Yellow
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B. Black
d
C. Green
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D. Blue
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C. Green
d
Green is the designated color for oxygen systems in medical gas piping, as p
d d d d d d d d d d d d d
er NFPA 99.
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8. Who must verify the medical gas system before it is placed into s
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ervice?
A. Installing contractor
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B. Hospital staff
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C. Certified third-party verifier
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D. Project manager
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C. Certified third-party verifier
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NFPA 99 requires verification by a certified verifier to ensure the system me
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ets all safety and performance standards.
d d d d d
9. What is the function of a zone valve box? d d d d d d d d
A. Increase gas pressure
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B. Store excess gas
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C. Isolate specific areas during maintenance or emergencies
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, D. Regulate temperature
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C. Isolate specific areas during maintenance or emergencies
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Zone valves allow specific sections of the system to be shut off for repairs or
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in case of emergency.
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10. At what location must zone valves be installed?
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A. At every outlet
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B. Outside the building
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C. Immediately outside each operating room or critical care area
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D. At the central supply system
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C. Immediately outside each operating room or critical care area
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This allows for quick isolation of gas supply in emergency situations.
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11. What is the acceptable method to clean medical gas copper t d d d d d d d d d d
ubing before installation? d d
A. Using sandpaper and water
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B. Mechanical brushing with solvent
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C. Use of oily cloth
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D. Abrasive blasting
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B. Mechanical brushing with solvent
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Cleaning with a solvent and mechanical means ensures removal of contaminan
d d d d d d d d d d
ts without introducing oils or residue.
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12. What is the minimum distance between a medical gas pipeline d d d d d d d d d d
and an electrical conduit? d d d
A. 1 inch
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B. 2 inches
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C. 6 inches
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D. 12 inches
d d
UESTIONS AND CORRECT ANSWERS (VERIFI d d d d
ED ANSWERS) PLUS RATIONALES 2026 Q&
d d d d d
A | INSTANT DOWNLOAD PDF
d d d d
1. What is the standard that governs the installation of medical gas and
d d d d d d d d d d d d d
vacuum systems? d
A. NFPA 58
d d
B. NFPA 99
d d
C. NFPA 70
d d
D. ASME B31.1
d d
B. NFPA 99
d d
NFPA 99 is the Health Care Facilities Code and sets the standards for m
d d d d d d d d d d d d d
edical gas and vacuum systems.
d d d d
2. Which type of brazing alloy is required for medical gas piping?
d d d d d d d d d d
A. Lead-based alloy
d d
B. Aluminum-based alloy
d d
C. Copper-phosphorus alloy without flux
d d d d
D. Tin-silver alloy with flux
d d d d
C. Copper-phosphorus alloy without flux
d d d d
Flux is not allowed in medical gas systems to prevent contamination.
d d d d d d d d d d d
Copper-phosphorus alloy is acceptable for joining copper pipes. d d d d d d d
, 3. Before brazing, what must be done to purge the pipe?
d d d d d d d d d
A. Fill with compressed air
d d d d
B. Fill with oxygen
d d d
C. Purge with nitrogen
d d d
D. Fill with helium
d d d
C. Purge with nitrogen
d d d
Nitrogen purging is required during brazing to prevent internal oxidation a
d d d d d d d d d d
nd contamination of the pipe.
d d d d
4. What is the minimum pressure test required for medical gas piping
d d d d d d d d d d d
after installation? d
A. 50 psig
d d
B. 100 psig
d d
C. 150 psig
d d
D. 150% of the system pressure
d d d d d
D. 150% of the system pressure
d d d d d
NFPA 99 requires pressure testing at 1.5 times the operating pressure to ens
d d d d d d d d d d d d
ure the system’s integrity.
d d d
5. What type of piping material is approved for medical gas installations?
d d d d d d d d d d
A. PVC
d
B. Black steel
d d
C. Copper Type K cleaned for oxygen service
d d d d d d d
D. Galvanized steel
d d
C. Copper Type K cleaned for oxygen service
d d d d d d d
Only Type K copper that has been cleaned and capped is suitable for m
d d d d d d d d d d d d d
edical gas systems to ensure purity and strength.
d d d d d d d
6. How should copper medical gas pipe be identified?
d d d d d d d
,A. By size only
d d d
B. With red color coding
d d d d
C. With manufacturer’s logo
d d d
D. By a label stating “OXY” and a green color band
d d d d d d d d d d
D. By a label stating “OXY” and a green color band
d d d d d d d d d d
Medical gas piping must be clearly labeled with the gas name and color cod
d d d d d d d d d d d d d
e to prevent cross-connection and ensure safety.
d d d d d d
7. What color is used to identify oxygen piping?d d d d d d d
A. Yellow
d
B. Black
d
C. Green
d
D. Blue
d
C. Green
d
Green is the designated color for oxygen systems in medical gas piping, as p
d d d d d d d d d d d d d
er NFPA 99.
d d
8. Who must verify the medical gas system before it is placed into s
d d d d d d d d d d d d
ervice?
A. Installing contractor
d d
B. Hospital staff
d d
C. Certified third-party verifier
d d d
D. Project manager
d d
C. Certified third-party verifier
d d d
NFPA 99 requires verification by a certified verifier to ensure the system me
d d d d d d d d d d d d
ets all safety and performance standards.
d d d d d
9. What is the function of a zone valve box? d d d d d d d d
A. Increase gas pressure
d d d
B. Store excess gas
d d d
C. Isolate specific areas during maintenance or emergencies
d d d d d d d
, D. Regulate temperature
d d
C. Isolate specific areas during maintenance or emergencies
d d d d d d d
Zone valves allow specific sections of the system to be shut off for repairs or
d d d d d d d d d d d d d d d
in case of emergency.
d d d
10. At what location must zone valves be installed?
d d d d d d d
A. At every outlet
d d d
B. Outside the building
d d d
C. Immediately outside each operating room or critical care area
d d d d d d d d d
D. At the central supply system
d d d d d
C. Immediately outside each operating room or critical care area
d d d d d d d d d
This allows for quick isolation of gas supply in emergency situations.
d d d d d d d d d d
11. What is the acceptable method to clean medical gas copper t d d d d d d d d d d
ubing before installation? d d
A. Using sandpaper and water
d d d d
B. Mechanical brushing with solvent
d d d d
C. Use of oily cloth
d d d d
D. Abrasive blasting
d d
B. Mechanical brushing with solvent
d d d d
Cleaning with a solvent and mechanical means ensures removal of contaminan
d d d d d d d d d d
ts without introducing oils or residue.
d d d d d
12. What is the minimum distance between a medical gas pipeline d d d d d d d d d d
and an electrical conduit? d d d
A. 1 inch
d d
B. 2 inches
d d
C. 6 inches
d d
D. 12 inches
d d
