System Testing Flashcards

What is the primary purpose of the 'operational pressure test' conducted at medical gas outlet stations during final system verification?

Answer: To confirm the system delivers gas at the correct pressure range under simulated use conditions

The operational pressure test simulates actual use conditions to confirm that pipeline pressure at the outlet station stays within the required 50–55 psig range during flow.

When verifying a medical air system produced by a compressor, what parameter must be measured and documented to confirm the air meets medical grade purity requirements?

Answer: Carbon monoxide and dew point

Medical air purity requires testing for carbon monoxide (≤10 ppm) and dew point (≤−26°C at line pressure) as primary purity indicators per NFPA 99 and USP standards.

During system testing, an RMGA observes that the master alarm panel does not annunciate when pipeline pressure drops below the low-pressure setpoint. What is the required response?

Answer: Fail the system and require repair and retest of the alarm system before certification

A non-functional master alarm is a critical safety failure; the system cannot be certified until the alarm is repaired and successfully retested to function correctly.

What is the correct sequence for conducting a cross-connection test on a newly installed multi-gas medical pipeline system?

Answer: Pressurize one gas at a time with nitrogen while all other lines remain unpressurized, then test every outlet

NFPA 99 requires testing one gas line at a time with a test gas while all other lines remain depressurized, then confirming at every outlet that only the correct gas is present.

Why must all system testing of medical gas piping be performed BEFORE any gas-powered medical equipment is connected to the outlets?

Answer: To ensure test results accurately reflect the piping system and are not influenced by connected equipment

Connected equipment can mask leaks, affect flow readings, or introduce contaminants, so testing must be done on the bare piping system to obtain accurate, unambiguous results.

During verification of a medical gas system addition (new wing), an RMGA must test the interface between the new and existing piping. Which test is most critical at this junction?

Answer: Cross-connection test at the tie-in point and downstream outlets

The tie-in between new and existing piping is the highest-risk point for cross-connections or mislabeled connections, so cross-connection testing at and downstream of the junction is essential.

According to NFPA 99, which of the following parties is prohibited from performing the final system verification of a medical gas pipeline?

Answer: The contractor who installed the piping system

NFPA 99 requires that verification be performed by a party independent from the installing contractor to avoid conflicts of interest and ensure objective results.