1|Page
Medical Gas Installer License Written (ASSE 6010)
Exam | Latest Verified Questions and Detailed
Answers
OVERVIEW DESCRIPTION
This comprehensive set of multiple-choice questions is designed for the Medical Gas
Installer License Written Exam based on the ASSE 6010 Standard. It covers the full
scope of the trade, including copper piping materials and installation, brazing
procedures per ASME Section IX, nitrogen purging, NFPA 99 requirements for source
equipment and alarms, NFPA 55 cryogenic storage safety, and the complete sequence
of pressure testing, cross-connection testing, and gas identity verification for both
positive-pressure and vacuum systems. Every question targets the practical
knowledge and code compliance needed to install, purge, and test medical gas and
vacuum systems safely in healthcare facilities.
QUESTION 1
Which copper tube types are approved for use in positive-pressure medical gas piping
under NFPA 99?
A) Type M only
B) Type K and Type L, cleaned for oxygen service
C) Type K, L, and M
D) Type DWV and Type M
CORRECT ANSWER: B
EXPERT RATIONALE: NFPA 99 requires hard-drawn seamless copper tube Type K or L
per ASTM B819 that is cleaned for oxygen service. Type M is only permitted for
vacuum/WAGD systems.
QUESTION 2
What is the primary purpose of nitrogen purging during brazing of medical gas pipe?
,2|Page
A) To cool the joint quickly
B) To prevent copper oxide scale formation inside the tube
C) To pressurize the pipe for leak detection
D) To increase brazing filler metal flow
CORRECT ANSWER: B
EXPERT RATIONALE: An inert gas like nitrogen displaces oxygen, preventing oxidation
that forms copper oxide scale which could contaminate the system.
QUESTION 3
Per NFPA 99, the minimum test pressure for initial pressure testing of medical gas
piping is:
A) 50 psi
B) 100 psi
C) 1.5 times the system working pressure but not less than 150 psi
D) 200 psi for all systems
CORRECT ANSWER: C
EXPERT RATIONALE: The initial pressure test must be 1.5 times the working pressure,
with an absolute minimum of 150 psi gauge.
QUESTION 4
Which of the following is acceptable for medical-surgical vacuum piping without
oxygen-cleaned tube?
A) Type K
B) Type L
C) Type M
D) All of the above
CORRECT ANSWER: D
,3|Page
EXPERT RATIONALE: NFPA 99 allows Type K, L, or M copper for vacuum and WAGD
piping; oxygen cleaning is not mandatory for these systems.
QUESTION 5
During brazing of medical gas tubing, which standard governs the qualification of the
brazing procedure?
A) ASME Section IX
B) ASME B31.1
C) AWS D1.1
D) NFPA 55
CORRECT ANSWER: A
EXPERT RATIONALE: Brazing procedure and performance qualifications for medical gas
piping must conform to ASME Boiler and Pressure Vessel Code Section IX.
QUESTION 6
A master alarm panel for a bulk medical oxygen system must provide a local audible
and visual signal for which condition?
A) Room temperature
B) High and low header pressure
C) Compressor oil level
D) Zone valve position
CORRECT ANSWER: B
EXPERT RATIONALE: NFPA 99 requires master alarms to monitor high and low gas
pressure in the main supply line, plus reserve status for bulk systems.
QUESTION 7
What is the required test pressure for a vacuum piping system positive-pressure test
, 4|Page
under NFPA 99?
A) 30 psi
B) 60 psi
C) 150 psi
D) 1.5 times working vacuum
CORRECT ANSWER: B
EXPERT RATIONALE: Vacuum system piping must be tested at a minimum gauge
pressure of 60 psi (414 kPa) with oil-free dry nitrogen or air.
QUESTION 8
The cross-connection test of medical gas piping is intended to verify:
A) Adequate brazing filler metal
B) That no interconnection exists between separate gas systems
C) Pipe support spacing
D) Compressor cycling
CORRECT ANSWER: B
EXPERT RATIONALE: By isolating one system and pressurizing it, all other system outlets
are checked to ensure no gas travels to the wrong pipeline.
QUESTION 9
When performing a cross-connection test, the test pressure applied to the isolated
piping system is typically:
A) 30 psi
B) 50 psi
C) 150 psi
D) 200 psi
CORRECT ANSWER: B
Medical Gas Installer License Written (ASSE 6010)
Exam | Latest Verified Questions and Detailed
Answers
OVERVIEW DESCRIPTION
This comprehensive set of multiple-choice questions is designed for the Medical Gas
Installer License Written Exam based on the ASSE 6010 Standard. It covers the full
scope of the trade, including copper piping materials and installation, brazing
procedures per ASME Section IX, nitrogen purging, NFPA 99 requirements for source
equipment and alarms, NFPA 55 cryogenic storage safety, and the complete sequence
of pressure testing, cross-connection testing, and gas identity verification for both
positive-pressure and vacuum systems. Every question targets the practical
knowledge and code compliance needed to install, purge, and test medical gas and
vacuum systems safely in healthcare facilities.
QUESTION 1
Which copper tube types are approved for use in positive-pressure medical gas piping
under NFPA 99?
A) Type M only
B) Type K and Type L, cleaned for oxygen service
C) Type K, L, and M
D) Type DWV and Type M
CORRECT ANSWER: B
EXPERT RATIONALE: NFPA 99 requires hard-drawn seamless copper tube Type K or L
per ASTM B819 that is cleaned for oxygen service. Type M is only permitted for
vacuum/WAGD systems.
QUESTION 2
What is the primary purpose of nitrogen purging during brazing of medical gas pipe?
,2|Page
A) To cool the joint quickly
B) To prevent copper oxide scale formation inside the tube
C) To pressurize the pipe for leak detection
D) To increase brazing filler metal flow
CORRECT ANSWER: B
EXPERT RATIONALE: An inert gas like nitrogen displaces oxygen, preventing oxidation
that forms copper oxide scale which could contaminate the system.
QUESTION 3
Per NFPA 99, the minimum test pressure for initial pressure testing of medical gas
piping is:
A) 50 psi
B) 100 psi
C) 1.5 times the system working pressure but not less than 150 psi
D) 200 psi for all systems
CORRECT ANSWER: C
EXPERT RATIONALE: The initial pressure test must be 1.5 times the working pressure,
with an absolute minimum of 150 psi gauge.
QUESTION 4
Which of the following is acceptable for medical-surgical vacuum piping without
oxygen-cleaned tube?
A) Type K
B) Type L
C) Type M
D) All of the above
CORRECT ANSWER: D
,3|Page
EXPERT RATIONALE: NFPA 99 allows Type K, L, or M copper for vacuum and WAGD
piping; oxygen cleaning is not mandatory for these systems.
QUESTION 5
During brazing of medical gas tubing, which standard governs the qualification of the
brazing procedure?
A) ASME Section IX
B) ASME B31.1
C) AWS D1.1
D) NFPA 55
CORRECT ANSWER: A
EXPERT RATIONALE: Brazing procedure and performance qualifications for medical gas
piping must conform to ASME Boiler and Pressure Vessel Code Section IX.
QUESTION 6
A master alarm panel for a bulk medical oxygen system must provide a local audible
and visual signal for which condition?
A) Room temperature
B) High and low header pressure
C) Compressor oil level
D) Zone valve position
CORRECT ANSWER: B
EXPERT RATIONALE: NFPA 99 requires master alarms to monitor high and low gas
pressure in the main supply line, plus reserve status for bulk systems.
QUESTION 7
What is the required test pressure for a vacuum piping system positive-pressure test
, 4|Page
under NFPA 99?
A) 30 psi
B) 60 psi
C) 150 psi
D) 1.5 times working vacuum
CORRECT ANSWER: B
EXPERT RATIONALE: Vacuum system piping must be tested at a minimum gauge
pressure of 60 psi (414 kPa) with oil-free dry nitrogen or air.
QUESTION 8
The cross-connection test of medical gas piping is intended to verify:
A) Adequate brazing filler metal
B) That no interconnection exists between separate gas systems
C) Pipe support spacing
D) Compressor cycling
CORRECT ANSWER: B
EXPERT RATIONALE: By isolating one system and pressurizing it, all other system outlets
are checked to ensure no gas travels to the wrong pipeline.
QUESTION 9
When performing a cross-connection test, the test pressure applied to the isolated
piping system is typically:
A) 30 psi
B) 50 psi
C) 150 psi
D) 200 psi
CORRECT ANSWER: B
