RMGA Code Requirements 2 — Questions and Answers
Question 1: Under NFPA 99, what is the minimum pressure at which Level 1 medical gas systems must be tested for leaks after installation?
- 1.5 times the working pressure (Correct answer)
- 150 psi regardless of working pressure
- The normal working pressure only
- 50 psi above working pressure
Correct answer: 1.5 times the working pressure
NFPA 99 requires leak testing at 1.5 times the system working pressure to ensure integrity under stress conditions.
Question 2: Which NFPA 99 category applies to facilities where failure of equipment is not likely to cause injury but may impact patient care?
- Category 1
- Category 2
- Category 3 (Correct answer)
- Category 4
Correct answer: Category 3
Category 3 covers equipment where failure is unlikely to cause injury but could disrupt patient care or treatment.
Question 3: According to NFPA 99, medical gas piping systems must be labeled at minimum intervals of how many feet in corridors?
- 20 feet (Correct answer)
- 30 feet
- 50 feet
- 100 feet
Correct answer: 20 feet
NFPA 99 requires medical gas piping to be labeled at least every 20 feet in corridors to aid identification.
Question 4: What document must be completed and retained before a medical gas system or addition is placed into service per NFPA 99?
- A pressure drop test log
- A verifier's report (Correct answer)
- An installer's certification
- A zone valve schedule
Correct answer: A verifier's report
NFPA 99 requires a verifier's report documenting that all required tests were performed and passed before system activation.
Question 5: Under CGA G-4.1, which contaminant level is the primary concern when assessing medical oxygen purity?
- Carbon dioxide above 0.005%
- Moisture above acceptable dew point limits (Correct answer)
- Nitrogen above 1%
- Argon above 0.5%
Correct answer: Moisture above acceptable dew point limits
CGA G-4.1 focuses on moisture content as excess water vapor can cause equipment failure and patient harm in oxygen systems.
Question 6: NFPA 99 requires medical gas zone valves to be located where in relation to the areas they serve?
- Inside the room being served
- Outside and adjacent to each patient care area (Correct answer)
- At the main supply source only
- In the mechanical room
Correct answer: Outside and adjacent to each patient care area
Zone valves must be located outside and adjacent to the patient care area they serve so staff can shut off gas without entering the affected area.
Question 7: According to NFPA 99, which of the following gases requires a distinct DISS (Diameter Index Safety System) fitting to prevent cross-connection?
- Only oxygen and nitrous oxide
- Only nitrogen and instrument air
- All medical gases including vacuum (Correct answer)
- Only flammable medical gases
Correct answer: All medical gases including vacuum
NFPA 99 mandates DISS fittings for all medical gases and vacuum to make cross-connections physically impossible.
RMGA Code Requirements 2
Under NFPA 99, what is the minimum pressure at which Level 1 medical gas systems must be tested for leaks after installation?