Medical Gas 6010 Installer Exam Prep 2026 | 200 Practice
Questions with Answers & Explanations | Certification
Study Guide
SECTION A: CODES, STANDARDS, AND GENERAL REQUIREMENTS (Questions 1–70)
1. Which standard is the primary reference for medical gas piping systems in healthcare facilities in the
United States?
A. NFPA 99 (Health Care Facilities Code)
B. ASME B31.3 (Process Piping)
C. ASSE 6010 (Medical Gas Systems Installer)
D. CGA V-5 (Cylinder Connections)
Answer: A
Explanation: NFPA 99 is the overarching code for health care facilities, including medical gas systems.
ASSE 6010 is personnel certification.
2. Under NFPA 99, the maximum allowable concentration of oil in medical air is:
A. 0.1 mg/m³
B. 0.01 mg/m³
C. 1.0 mg/m³
D. 0.5 mg/m³
Answer: B
Explanation: NFPA 99 requires oil-free air; maximum oil content is 0.01 mg/m³ (10 ppb) for medical air.
3. A medical gas installer certified under ASSE 6010 is permitted to:
A. Install, braze, test, and certify medical gas piping up to the station outlet
B. Design medical gas systems
C. Perform annual inspections independently
D. Install vacuum systems only
,Answer: A
Explanation: ASSE 6010 covers installation, brazing, testing, and verification of medical gas piping; design
requires engineering.
4. Which organization publishes the "Medical Gas and Vacuum Systems" standard that is referenced by
NFPA 99?
A. ASME (American Society of Mechanical Engineers)
B. ASTM (American Society for Testing and Materials)
C. CGA (Compressed Gas Association)
D. ASSE (American Society of Sanitary Engineering)
Answer: C
Explanation: CGA G-1 (Acetylene) and CGA M-1 (Medical Gas) are referenced; CGA P-1 provides safe
handling.
5. The color code for oxygen piping in medical gas systems according to CGA C-9 is:
A. Green
B. Yellow
C. Black with white lettering
D. Gray
Answer: A
Explanation: CGA C-9 standard color for oxygen is green; medical air is yellow; nitrous oxide is blue;
nitrogen is black.
6. A medical gas installer is required to renew their ASSE 6010 certification every:
A. 3 years
B. 5 years
C. 1 year
D. 10 years
Answer: A
,Explanation: ASSE 6010 certification is valid for 3 years; renewal requires continuing education or re-
examination.
7. According to NFPA 99, medical gas piping must be cleaned for oxygen service to remove:
A. Hydrocarbons, particulates, and moisture
B. Only visible rust
C. All traces of copper oxide
D. Flux residues from brazing
Answer: A
Explanation: Oxygen service cleaning removes combustible hydrocarbons, particulates, and moisture
that could cause fire or contamination.
8. The minimum size of a medical gas source (manifold) for a hospital with more than 10 patient care
areas is typically based on:
A. Peak calculated demand per NFPA 99
B. Number of beds multiplied by 2 L/min
C. Square footage of the facility
D. Local fire code only
Answer: A
Explanation: NFPA 99 requires demand calculations using established flow rates for each type of outlet;
peak demand determines source capacity.
9. A medical gas system must be tested for purity after installation. The maximum allowable moisture
content for medical oxygen is:
A. 10 ppm (parts per million) by volume
B. 100 ppm
C. 50 ppm
D. 1 ppm
Answer: A
Explanation: NFPA 99 and USP standards require oxygen moisture ≤10 ppm; higher moisture can cause
corrosion or freezing in regulators.
, 10. Which of the following is an acceptable method for joining medical gas copper tubing?
A. Brazing with 15% silver alloy (BCuP-5)
B. Soft soldering with lead-free solder
C. Compression fittings inside walls
D. Threaded connections
Answer: A
Explanation: Brazing with silver alloy (BCuP-5 or BAg series) is required; soft soldering and threaded
joints are prohibited in medical gas lines.
11. During installation, medical gas piping must be capped at the end of each workday to:
A. Prevent contamination from dust and moisture
B. Allow pressure testing overnight
C. Comply with OSHA lockout/tagout
D. Reduce theft of copper
Answer: A
Explanation: Capping prevents entry of debris, moisture, and construction dust, which could
compromise system purity.
12. The minimum pressure test for a medical gas piping system after installation is:
A. 1.5 times the system working pressure, but not less than 150 psi (1035 kPa)
B. 2 times the working pressure
C. System working pressure plus 50 psi
D. 100 psi for all systems
Answer: A
Explanation: NFPA 99 requires pressure test at 1.5 × working pressure or 150 psi, whichever is higher,
for at least 24 hours.
13. A medical vacuum system must maintain a minimum vacuum level at the outlet of:
A. 12 inHg (305 mmHg) below atmospheric pressure
Questions with Answers & Explanations | Certification
Study Guide
SECTION A: CODES, STANDARDS, AND GENERAL REQUIREMENTS (Questions 1–70)
1. Which standard is the primary reference for medical gas piping systems in healthcare facilities in the
United States?
A. NFPA 99 (Health Care Facilities Code)
B. ASME B31.3 (Process Piping)
C. ASSE 6010 (Medical Gas Systems Installer)
D. CGA V-5 (Cylinder Connections)
Answer: A
Explanation: NFPA 99 is the overarching code for health care facilities, including medical gas systems.
ASSE 6010 is personnel certification.
2. Under NFPA 99, the maximum allowable concentration of oil in medical air is:
A. 0.1 mg/m³
B. 0.01 mg/m³
C. 1.0 mg/m³
D. 0.5 mg/m³
Answer: B
Explanation: NFPA 99 requires oil-free air; maximum oil content is 0.01 mg/m³ (10 ppb) for medical air.
3. A medical gas installer certified under ASSE 6010 is permitted to:
A. Install, braze, test, and certify medical gas piping up to the station outlet
B. Design medical gas systems
C. Perform annual inspections independently
D. Install vacuum systems only
,Answer: A
Explanation: ASSE 6010 covers installation, brazing, testing, and verification of medical gas piping; design
requires engineering.
4. Which organization publishes the "Medical Gas and Vacuum Systems" standard that is referenced by
NFPA 99?
A. ASME (American Society of Mechanical Engineers)
B. ASTM (American Society for Testing and Materials)
C. CGA (Compressed Gas Association)
D. ASSE (American Society of Sanitary Engineering)
Answer: C
Explanation: CGA G-1 (Acetylene) and CGA M-1 (Medical Gas) are referenced; CGA P-1 provides safe
handling.
5. The color code for oxygen piping in medical gas systems according to CGA C-9 is:
A. Green
B. Yellow
C. Black with white lettering
D. Gray
Answer: A
Explanation: CGA C-9 standard color for oxygen is green; medical air is yellow; nitrous oxide is blue;
nitrogen is black.
6. A medical gas installer is required to renew their ASSE 6010 certification every:
A. 3 years
B. 5 years
C. 1 year
D. 10 years
Answer: A
,Explanation: ASSE 6010 certification is valid for 3 years; renewal requires continuing education or re-
examination.
7. According to NFPA 99, medical gas piping must be cleaned for oxygen service to remove:
A. Hydrocarbons, particulates, and moisture
B. Only visible rust
C. All traces of copper oxide
D. Flux residues from brazing
Answer: A
Explanation: Oxygen service cleaning removes combustible hydrocarbons, particulates, and moisture
that could cause fire or contamination.
8. The minimum size of a medical gas source (manifold) for a hospital with more than 10 patient care
areas is typically based on:
A. Peak calculated demand per NFPA 99
B. Number of beds multiplied by 2 L/min
C. Square footage of the facility
D. Local fire code only
Answer: A
Explanation: NFPA 99 requires demand calculations using established flow rates for each type of outlet;
peak demand determines source capacity.
9. A medical gas system must be tested for purity after installation. The maximum allowable moisture
content for medical oxygen is:
A. 10 ppm (parts per million) by volume
B. 100 ppm
C. 50 ppm
D. 1 ppm
Answer: A
Explanation: NFPA 99 and USP standards require oxygen moisture ≤10 ppm; higher moisture can cause
corrosion or freezing in regulators.
, 10. Which of the following is an acceptable method for joining medical gas copper tubing?
A. Brazing with 15% silver alloy (BCuP-5)
B. Soft soldering with lead-free solder
C. Compression fittings inside walls
D. Threaded connections
Answer: A
Explanation: Brazing with silver alloy (BCuP-5 or BAg series) is required; soft soldering and threaded
joints are prohibited in medical gas lines.
11. During installation, medical gas piping must be capped at the end of each workday to:
A. Prevent contamination from dust and moisture
B. Allow pressure testing overnight
C. Comply with OSHA lockout/tagout
D. Reduce theft of copper
Answer: A
Explanation: Capping prevents entry of debris, moisture, and construction dust, which could
compromise system purity.
12. The minimum pressure test for a medical gas piping system after installation is:
A. 1.5 times the system working pressure, but not less than 150 psi (1035 kPa)
B. 2 times the working pressure
C. System working pressure plus 50 psi
D. 100 psi for all systems
Answer: A
Explanation: NFPA 99 requires pressure test at 1.5 × working pressure or 150 psi, whichever is higher,
for at least 24 hours.
13. A medical vacuum system must maintain a minimum vacuum level at the outlet of:
A. 12 inHg (305 mmHg) below atmospheric pressure
