RMGA Safety Standards 5 — Questions and Answers
Question 1: What is the minimum pipe wall thickness requirement rationale for medical gas copper tubing compared to standard plumbing copper?
- Medical gas copper must be thicker to withstand higher pressures
- Medical gas copper must be cleaned and capped to prevent contamination, not necessarily thicker (Correct answer)
- Medical gas copper must be thinner to reduce weight on ceiling supports
- Medical gas copper requires double-wall construction
Correct answer: Medical gas copper must be cleaned and capped to prevent contamination, not necessarily thicker
Medical gas copper tubing (ACR or medical grade) must be internally cleaned and sealed to prevent hydrocarbon contamination, which distinguishes it from standard plumbing copper.
Question 2: Under NFPA 99, how must medical gas alarm signals be categorized to ensure appropriate staff response?
- As critical and non-critical only
- As immediate danger, prompt danger, and general warning
- As warning, caution, and advisory levels (Correct answer)
- No categorization required; all alarms are treated equally
Correct answer: As warning, caution, and advisory levels
NFPA 99 categorizes medical gas alarms as warning, caution, and advisory to differentiate urgency and guide staff response priorities.
Question 3: When a medical gas cylinder valve is found to be leaking at the packing gland, what is the correct immediate action?
- Tighten the packing nut while the cylinder remains in service
- Move the cylinder outdoors and notify the supplier (Correct answer)
- Attempt to repair the valve with a cylinder repair kit
- Continue using the cylinder until it is empty
Correct answer: Move the cylinder outdoors and notify the supplier
A leaking cylinder valve packing gland requires moving the cylinder to a safe outdoor location and notifying the gas supplier for proper handling and exchange.
Question 4: According to NFPA 99, what is the required minimum distance between a medical gas shutoff valve and a sprinkler head?
- 12 inches
- 18 inches (Correct answer)
- 6 inches
- 24 inches
Correct answer: 18 inches
NFPA 99 requires medical gas valves to be installed at least 18 inches from sprinkler heads to prevent water from activating or damaging the valve.
Question 5: Which document must be maintained by the RMGA for every medical gas system component installed or replaced in a Level 1 facility?
- Manufacturer's marketing literature
- As-built drawings, certifications, and test reports (Correct answer)
- OSHA incident reports only
- Insurance inspection certificates only
Correct answer: As-built drawings, certifications, and test reports
NFPA 99 requires maintaining as-built drawings, component certifications, and verification test reports for Level 1 medical gas system components to support ongoing safety and compliance.
Question 6: What is the maximum allowable concentration of total hydrocarbons in medical-grade oxygen per USP specifications?
- 25 ppm (Correct answer)
- 0.001%
- 10 ppm
- 5 ppm
Correct answer: 25 ppm
USP medical oxygen specifications allow a maximum total hydrocarbon concentration of 25 ppm to ensure purity and patient safety.
Question 7: During a medical gas system pressure test, if a brazed joint fails, what corrective action is required before repeating the test?
- Apply sealant tape to the failed joint and retest
- Re-braze the joint using silver-alloy brazing filler and purge with nitrogen before retesting (Correct answer)
- Replace the entire pipe section
- Increase test pressure to force the joint to seal
Correct answer: Re-braze the joint using silver-alloy brazing filler and purge with nitrogen before retesting
A failed brazed joint must be properly re-brazed with silver-alloy filler material and the system must be purged with nitrogen before the pressure test is repeated.
RMGA Safety Standards 5
What is the minimum pipe wall thickness requirement rationale for medical gas copper tubing compared to standard plumbing copper?