Definitions

Control equipment — components necessary to maintain the medical gas pipeline system within the specified operating parameters.

DISS- Diameter Index Safety System is a threaded gas-specific type of medical gas outlet connection

Gas-specific connector — a connector with dimensional characteristics that prevent connections between different gas services.

Line pressure regulator — a pressure regulator intended to supply the nominal distribution pressure to the terminal units.

Nominal distribution pressure — the pressure that the medical gas pipeline system is intended to deliver to the terminal units.

Pipeline distribution system — the portion of a medical gas, vacuum, medical support gas, or AGSS  located from and including the main supply shut off valve to (and including all terminal units), junction points, or demarcation points.

Pressure relief device (PRD) — a fitting installed on pressure equipment designed to provide primary protection from overpressurization. PRDs include both reclosing devices (e.g., safety valves, relief valves, safety relief valves) and non-reclosing devices (including rupture discs and fusible plugs).

Primary source — the portion of a supply system that is the first to be drawn on to supply the pipeline distribution system.

Reserve source — the portion of the supply system that supplies the complete pipeline distribution system, or a portion of it, in the event of failure or exhaustion of both the primary and secondary sources of supply.

Secondary source — the portion of the supply system that supplies the pipeline distribution system in the event of failure or exhaustion of the primary source of supply.