Texas Medical Gas Piping Installation
Endorsement Examination Practice
Exam 2026 | 100 Questions & Answers
with Detailed Rationales | Complete
Exam Prep & Study Guide
1. Which standard primarily governs the installation of medical gas and
vacuum systems in healthcare facilities?
A. IPC
B. UPC
C. NFPA 99
D. IRC
Answer: C. NFPA 99
Rationale: NFPA 99 establishes the requirements for medical gas and vacuum
systems used in healthcare facilities, including installation, testing, verification,
and maintenance.
2. Medical gas piping is primarily installed to transport:
A. Potable water
B. Wastewater
,C. Medical gases and vacuum for patient care
D. Steam only
Answer: C. Medical gases and vacuum for patient care
Rationale: Medical gas systems safely distribute oxygen, nitrous oxide, medical
air, vacuum, and other gases used in patient treatment.
3. Which material is most commonly approved for medical gas piping?
A. PVC
B. Galvanized steel
C. Type K or Type L hard-drawn copper tube cleaned for oxygen service
D. Black iron
Answer: C. Type K or Type L hard-drawn copper tube cleaned for oxygen service
Rationale: Medical gas systems require specially cleaned copper tubing to
prevent contamination and ensure patient safety.
4. Medical gas copper tubing must be:
A. Painted before installation
B. Galvanized
C. Factory cleaned and capped for oxygen service
D. Flexible only
Answer: C. Factory cleaned and capped for oxygen service
Rationale: Cleaning removes contaminants that could ignite or contaminate
medical gases.
5. Brazing filler metals used on medical gas systems shall contain at least:
,A. 5% silver
B. 10% silver
C. 15% silver
D. 30% silver
Answer: C. 15% silver
Rationale: NFPA 99 requires brazing alloys containing at least 15% silver for
medical gas piping joints.
6. During brazing, the piping must be continuously purged with:
A. Oxygen
B. Compressed air
C. Carbon dioxide
D. Oil-free nitrogen
Answer: D. Oil-free nitrogen
Rationale: Nitrogen purging prevents oxidation and scale formation inside the
tubing.
7. Why is nitrogen purging required while brazing?
A. To cool the pipe
B. To increase pressure
C. To prevent oxidation inside the tubing
D. To increase silver flow
Answer: C. To prevent oxidation inside the tubing
Rationale: Oxidation can contaminate the medical gas system and damage
equipment.
, 8. Medical gas installers must generally hold:
A. HVAC certification only
B. Welding license only
C. Required plumbing license and medical gas endorsement
D. Electrician license
Answer: C. Required plumbing license and medical gas endorsement
Rationale: Texas requires qualified individuals with proper licensing and
endorsement for medical gas installation.
9. Medical vacuum systems are designed to:
A. Deliver oxygen
B. Heat buildings
C. Remove fluids and gases from patient care areas
D. Pump potable water
Answer: C. Remove fluids and gases from patient care areas
Rationale: Medical vacuum systems create suction used in patient treatment.
10.Oxygen piping should never be contaminated with:
A. Water
B. Dust only
C. Oil or grease
D. Air
Answer: C. Oil or grease
Rationale: Oil and grease may ignite violently in oxygen-enriched environments.
Endorsement Examination Practice
Exam 2026 | 100 Questions & Answers
with Detailed Rationales | Complete
Exam Prep & Study Guide
1. Which standard primarily governs the installation of medical gas and
vacuum systems in healthcare facilities?
A. IPC
B. UPC
C. NFPA 99
D. IRC
Answer: C. NFPA 99
Rationale: NFPA 99 establishes the requirements for medical gas and vacuum
systems used in healthcare facilities, including installation, testing, verification,
and maintenance.
2. Medical gas piping is primarily installed to transport:
A. Potable water
B. Wastewater
,C. Medical gases and vacuum for patient care
D. Steam only
Answer: C. Medical gases and vacuum for patient care
Rationale: Medical gas systems safely distribute oxygen, nitrous oxide, medical
air, vacuum, and other gases used in patient treatment.
3. Which material is most commonly approved for medical gas piping?
A. PVC
B. Galvanized steel
C. Type K or Type L hard-drawn copper tube cleaned for oxygen service
D. Black iron
Answer: C. Type K or Type L hard-drawn copper tube cleaned for oxygen service
Rationale: Medical gas systems require specially cleaned copper tubing to
prevent contamination and ensure patient safety.
4. Medical gas copper tubing must be:
A. Painted before installation
B. Galvanized
C. Factory cleaned and capped for oxygen service
D. Flexible only
Answer: C. Factory cleaned and capped for oxygen service
Rationale: Cleaning removes contaminants that could ignite or contaminate
medical gases.
5. Brazing filler metals used on medical gas systems shall contain at least:
,A. 5% silver
B. 10% silver
C. 15% silver
D. 30% silver
Answer: C. 15% silver
Rationale: NFPA 99 requires brazing alloys containing at least 15% silver for
medical gas piping joints.
6. During brazing, the piping must be continuously purged with:
A. Oxygen
B. Compressed air
C. Carbon dioxide
D. Oil-free nitrogen
Answer: D. Oil-free nitrogen
Rationale: Nitrogen purging prevents oxidation and scale formation inside the
tubing.
7. Why is nitrogen purging required while brazing?
A. To cool the pipe
B. To increase pressure
C. To prevent oxidation inside the tubing
D. To increase silver flow
Answer: C. To prevent oxidation inside the tubing
Rationale: Oxidation can contaminate the medical gas system and damage
equipment.
, 8. Medical gas installers must generally hold:
A. HVAC certification only
B. Welding license only
C. Required plumbing license and medical gas endorsement
D. Electrician license
Answer: C. Required plumbing license and medical gas endorsement
Rationale: Texas requires qualified individuals with proper licensing and
endorsement for medical gas installation.
9. Medical vacuum systems are designed to:
A. Deliver oxygen
B. Heat buildings
C. Remove fluids and gases from patient care areas
D. Pump potable water
Answer: C. Remove fluids and gases from patient care areas
Rationale: Medical vacuum systems create suction used in patient treatment.
10.Oxygen piping should never be contaminated with:
A. Water
B. Dust only
C. Oil or grease
D. Air
Answer: C. Oil or grease
Rationale: Oil and grease may ignite violently in oxygen-enriched environments.
