Pipeline Installation Flashcards

During initial pressure testing of a new medical gas pipeline system, what gas must be used for the standing pressure test?

Answer: Oil-free dry nitrogen

Oil-free dry nitrogen must be used for pressure testing medical gas pipelines to avoid introducing combustion risk, moisture, or contamination.

What is the required initial pressure for the high-pressure standing test on a new medical gas distribution system per NFPA 99?

Answer: 150 psi

The high-pressure standing test requires the system to hold 150 psi with nitrogen for a defined period without measurable pressure loss.

Cross-connection testing between different medical gas systems is required to verify which condition?

Answer: That each outlet delivers the correct gas identity

Cross-connection testing confirms that each outlet is connected to the correct gas source and no mixing of gas species has occurred during installation.

Medical gas piping must be labeled at maximum intervals of how many feet in accessible spaces per NFPA 99?

Answer: 20 feet

NFPA 99 requires medical gas piping to be labeled with the gas name and direction of flow at intervals not exceeding 20 feet in accessible areas.

Which of the following is the correct method for joining copper tubing sections in a medical gas pipeline?

Answer: Brazing with BAg-series filler metal and appropriate flux

Medical gas copper piping is joined by brazing using BAg (silver-based) alloys with compatible flux, which produces joints rated for high-purity gas service.

When installing a pressure/vacuum indicator alarm system, where must alarm panels for patient care areas be located?

Answer: At the nurses' station or other continuously monitored location

Area alarm panels must be located at continuously staffed locations such as nurses' stations so that pressure or vacuum failures are detected immediately.

Medical gas outlet stations in patient care areas must be designed so that adapters for different gases are:

Answer: Non-interchangeable and gas-specific (DISS or PISS connections)

Outlet stations use DISS (Diameter Index Safety System) or PISS connections that are gas-specific and physically non-interchangeable to prevent wrong-gas connections.