Who shall witness the installer performing the standing pressure test?

• A. Installation contractor superintendent
• B. Medical gas verifier
• C. The authority having jurisdiction or its designee
• D. B and C

Answer: (D)

The standing pressure test must be witnessed by two independent parties: the medical gas verifier and the authority having jurisdiction (or its designee). The medical gas verifier is the qualified expert charged with confirming the installation meets the design, that the test is performed correctly, and that the results are properly documented. The AHJ or its designee provides regulatory oversight, ensuring the testing and records comply with local codes and safety requirements. Relying solely on the installer’s supervisor wouldn’t provide the needed independent verification to ensure there are no leaks and that all standards are met. Having both witnesses ensures both technical accuracy and regulatory compliance.