RMGA Code Requirements 5 — Questions and Answers
Question 1: Under NFPA 99, what is the minimum operating pressure required at patient station outlets for piped oxygen systems?
- 35 psi
- 50 psi (Correct answer)
- 55 psi
- 60 psi
Correct answer: 50 psi
NFPA 99 requires a minimum of 50 psi at patient station outlets for piped oxygen to ensure adequate flow for all connected equipment.
Question 2: According to NFPA 99, when is it permissible to use flexible connectors in medical gas piping systems?
- Only at the connection to wall outlets
- Only for the final connection to equipment where vibration isolation is needed (Correct answer)
- Throughout the system where rigid pipe is impractical
- Never; only rigid piping is allowed
Correct answer: Only for the final connection to equipment where vibration isolation is needed
Flexible connectors are permitted only for the final connection to equipment requiring vibration isolation, not within the distribution piping.
Question 3: Per NFPA 99, bulk cryogenic oxygen storage systems located outdoors must maintain what minimum distance from building openings?
- 5 feet
- 10 feet (Correct answer)
- 15 feet
- 25 feet
Correct answer: 10 feet
NFPA 99 requires outdoor bulk liquid oxygen systems to be at least 10 feet from building openings to reduce fire and enriched-atmosphere hazards.
Question 4: Which organization must be notified before any alteration or addition to a medical gas system under the requirements of The Joint Commission?
- The state fire marshal only
- The Authority Having Jurisdiction (AHJ) (Correct answer)
- The original system installer
- The hospital's risk management department
Correct answer: The Authority Having Jurisdiction (AHJ)
The Authority Having Jurisdiction (AHJ) must be notified before altering medical gas systems as they enforce applicable codes and standards.
Question 5: Under NFPA 99, what is the maximum concentration of total hydrocarbons allowed in medical-grade compressed air?
- 1 ppm
- 5 ppm (Correct answer)
- 25 ppm
- 100 ppm
Correct answer: 5 ppm
NFPA 99 limits total hydrocarbons in medical compressed air to 5 ppm to protect patients from inhalation of contaminants.
Question 6: According to NFPA 99, brazing of medical gas copper piping joints must be performed using which filler material?
- BCuP-2 phosphor-copper alloy
- Solder with at least 95% tin content
- BCu filler metal (pure copper)
- BAg-series silver alloy filler (Correct answer)
Correct answer: BAg-series silver alloy filler
NFPA 99 requires BAg-series (silver brazing) alloy filler metals for medical gas copper joints to achieve the required strength and cleanliness.
Question 7: Per NFPA 99, which condition requires an immediate shutdown of a medical gas source equipment?
- Pressure drops to the low-pressure alarm setpoint
- A dew point alarm activates
- A source equipment alarm activates at the master panel (Correct answer)
- Cylinder pressure falls to 200 psi residual
Correct answer: A source equipment alarm activates at the master panel
A source equipment alarm at the master alarm panel signals a condition requiring immediate attention and potential shutdown to protect patient safety.
RMGA Code Requirements 5
Under NFPA 99, what is the minimum operating pressure required at patient station outlets for piped oxygen systems?