RMGA Inspection, Testing & Maintenance Procedures 5 — Questions and Answers
Question 1: During inspection of a medical vacuum system receiver, the inspector finds heavy oily residue inside the tank. What does this indicate and what action is required?
- Normal condensation; wipe clean and continue operation
- Oil carryover from the vacuum pumps, requiring investigation of pump seals and receiver cleaning (Correct answer)
- Moisture ingress from the piping system; increase vacuum level
- A sign that the system is operating efficiently; no action needed
Correct answer: Oil carryover from the vacuum pumps, requiring investigation of pump seals and receiver cleaning
Oily residue in the vacuum receiver indicates oil carryover from pump seals, which requires pump inspection, seal repair or replacement, and thorough receiver cleaning.
Question 2: When an RMGA conducts a terminal outlet identification test, which tool is specifically designed to verify the correct gas species at each outlet?
- A standard pressure gauge with DISS adapter
- A gas-specific analyzer or gas-identity tester matched to the gas being verified (Correct answer)
- A flow meter calibrated for nitrogen
- A universal digital manometer
Correct answer: A gas-specific analyzer or gas-identity tester matched to the gas being verified
Gas-specific analyzers are designed to positively identify the gas species at each outlet, which is required during identity verification testing.
Question 3: Per NFPA 99 requirements, what is the correct response when a medical gas master alarm panel fails completely (no power, no indicators)?
- Continue normal operations and repair the panel within 30 days
- Immediately implement manual monitoring procedures and repair the alarm system as soon as possible (Correct answer)
- Switch to a backup alarm panel if available, otherwise document and schedule repair
- Notify the medical director and await further instructions before acting
Correct answer: Immediately implement manual monitoring procedures and repair the alarm system as soon as possible
A completely failed master alarm panel removes critical patient safety monitoring, requiring immediate implementation of manual monitoring and emergency repair.
Question 4: An RMGA is inspecting a bulk liquid oxygen system and notices the outer vessel jacket is frosting over a large area. What does this indicate?
- The ambient temperature is unusually low that day
- Loss of vacuum in the outer jacket insulation, leading to heat infiltration (Correct answer)
- The system is operating at maximum capacity, which is normal
- A relief valve is intermittently opening due to high pressure
Correct answer: Loss of vacuum in the outer jacket insulation, leading to heat infiltration
Widespread frost on the outer jacket of a cryogenic vessel indicates vacuum failure in the insulation space, allowing atmospheric moisture to condense on the cold outer shell.
Question 5: Which frequency of inspection is required for medical gas source equipment under NFPA 99 as part of a preventive maintenance program?
- Daily visual checks only, with no formal scheduled inspection required
- Inspections per the manufacturer's recommendations and at minimum annually (Correct answer)
- Every 5 years unless a problem is observed
- Monthly full system shutdowns for inspection
Correct answer: Inspections per the manufacturer's recommendations and at minimum annually
NFPA 99 requires source equipment to be inspected per manufacturer specifications at a minimum annually as part of a formal preventive maintenance program.
Question 6: What action must be taken before any maintenance work is performed on a medical gas pipeline section that serves patient care areas?
- Notify the maintenance department supervisor only
- Coordinate with nursing staff, provide alternative gas supply if needed, and lock out/tag out the affected zone valve (Correct answer)
- Simply close the zone valve and begin work without notification
- Work can proceed without interruption if performed during off-peak hours
Correct answer: Coordinate with nursing staff, provide alternative gas supply if needed, and lock out/tag out the affected zone valve
Work on active patient care gas systems requires coordinating with clinical staff, arranging alternative supply, and performing lockout/tagout on the zone valve before proceeding.
Question 7: During a performance test of a medical air system, the dew point measurement at the point of use reads -20°F (-29°C) at line pressure. How should the RMGA interpret this result?
- The system passes; -20°F exceeds the minimum requirement
- The system fails; the dew point does not meet the NFPA 99 requirement of -40°F or lower (Correct answer)
- The result is acceptable if the ambient humidity is above 60%
- The dew point reading is irrelevant if the pressure is correct
Correct answer: The system fails; the dew point does not meet the NFPA 99 requirement of -40°F or lower
NFPA 99 requires medical air dew point to be at or below -40°F at line pressure; a reading of -20°F indicates inadequate drying and the system fails this criterion.
RMGA Inspection, Testing & Maintenance Procedures 5
During inspection of a medical vacuum system receiver, the inspector finds heavy oily residue inside the tank.
What does this indicate and what action is required?