Inspection, Testing & Maintenance Procedures Flashcards

During a periodic inspection of a bulk liquid oxygen system, the inspector notices ice formation around the vaporizer coils. What does this most likely indicate?

Answer: Insufficient ambient heat transfer causing inadequate vaporization

Ice formation around vaporizer coils indicates insufficient ambient heat transfer, meaning the system cannot vaporize liquid oxygen fast enough to meet demand.

According to NFPA 99, how often must zone valve boxes in medical gas piping systems be inspected?

Answer: Annually

NFPA 99 requires zone valve boxes to be inspected annually to verify proper labeling, accessibility, and operability.

A medical gas verifier is performing a cross-connection test. Which method is used to confirm that outlets in a zone are connected to the correct gas source?

Answer: Purging and testing each outlet with a specific gas analyzer while other zones are shut off

Cross-connection testing requires purging each zone and verifying the correct gas identity at each outlet using a gas-specific analyzer while adjacent zones are isolated.

When conducting a pressure relief valve test on a medical compressed air system, what is the primary safety concern?

Answer: Contaminating the medical air supply with atmospheric air during testing

During relief valve testing, atmospheric contaminants can be drawn into the system if the valve is opened to ambient air without proper isolation.

What is the maximum allowable pressure drop across a medical gas zone valve when fully open, per industry standards?

Answer: 1 psig

A fully open zone valve should produce no more than 1 psig pressure drop to ensure adequate gas flow to medical devices in the zone.

During inspection of a medical vacuum system, an RMGA finds that the reserve pump fails to start when the lead pump is shut off. What is the most likely cause?

Answer: A failed alternator relay or lead/lag switching mechanism

Failure of the reserve pump to start when the lead pump stops typically indicates a faulty alternator relay or lead/lag control mechanism.

Which of the following tests must be performed before a new medical gas piping system is placed into service, per NFPA 99?

Answer: Standing pressure test, cross-connection test, and purity test

NFPA 99 requires standing pressure testing, cross-connection verification, and gas purity testing before any new medical gas system is approved for patient use.