RMGA Installation Codes & Standards Compliance 2 — Questions and Answers
Question 1: According to NFPA 99, what is the minimum required pressure for a Level 1 medical oxygen system at the outlet?
- 345 kPa (50 psi)
- 414 kPa (60 psi) (Correct answer)
- 275 kPa (40 psi)
- 483 kPa (70 psi)
Correct answer: 414 kPa (60 psi)
NFPA 99 requires Level 1 medical oxygen systems to maintain a minimum of 414 kPa (60 psi) at the station outlet.
Question 2: Under CGA G-4.1, which material is prohibited for use in oxygen service piping due to flammability risk?
- Type K copper tubing
- Stainless steel 316L
- Polyvinyl chloride (PVC) (Correct answer)
- Brass fittings
Correct answer: Polyvinyl chloride (PVC)
CGA G-4.1 prohibits PVC and other combustible plastics in oxygen piping systems because they can ignite under high-pressure oxygen environments.
Question 3: What does NFPA 99 classify as a 'Category 1' gas system risk level?
- Systems where failure is unlikely to cause injury
- Systems where failure poses a risk of major injury or death (Correct answer)
- Systems used only for diagnostic purposes
- Systems with redundant backup supply
Correct answer: Systems where failure poses a risk of major injury or death
NFPA 99 Category 1 systems are those where equipment failure could result in serious injury or death to patients or caregivers.
Question 4: Per ASSE 6010 standards, who is qualified to perform work on medical gas and vacuum piping systems?
- Any licensed plumber with 2 years of experience
- A medical gas installer certified to ASSE 6010 (Correct answer)
- A mechanical engineer registered in the state
- Any HVAC technician with medical facility experience
Correct answer: A medical gas installer certified to ASSE 6010
ASSE 6010 certification is specifically required for personnel who install, inspect, and maintain medical gas and vacuum piping systems.
Question 5: According to NFPA 99, what is the maximum allowable pressure drop across a medical gas zone valve during peak flow conditions?
- 35 kPa (5 psi)
- 70 kPa (10 psi)
- 14 kPa (2 psi) (Correct answer)
- 105 kPa (15 psi)
Correct answer: 14 kPa (2 psi)
NFPA 99 limits pressure drop across zone valves to 14 kPa (2 psi) at peak demand to ensure adequate pressure at point of use.
Question 6: Which standard governs the color coding of medical gas piping in the United States?
- ANSI Z535.1
- CGA C-9 (Correct answer)
- ISO 32
- ASME B31.1
Correct answer: CGA C-9
CGA C-9 establishes the standard color coding for medical gas piping, with specific colors assigned to each gas type.
Question 7: What action is required when a new medical gas system segment is added to an existing NFPA 99 compliant system?
- Notify the AHJ within 30 days of completion
- Perform verification testing on the new segment only (Correct answer)
- Perform verification testing on the entire system
- Submit as-built drawings to the hospital engineering department
Correct answer: Perform verification testing on the new segment only
NFPA 99 requires verification testing of only the newly added segment, not the entire existing system, when making additions.
RMGA Installation Codes & Standards Compliance 2
According to NFPA 99, what is the minimum required pressure for a Level 1 medical oxygen system at the outlet?