A medical gas pipeline system carries oxygen, medical air, nitrous oxide, nitrogen, carbon dioxide and vacuum from central sources to the points of care. Because these gases support life and surgery, NFPA 99 sets detailed requirements for how pipelines are designed, installed, labeled, tested and maintained. Here’s an overview of the components and what facilities need to know.
Main components of a medical gas pipeline
- Sources: bulk oxygen with reserve supply and an emergency oxygen supply connection; cylinder manifolds for nitrous oxide, nitrogen and CO2; medical air plants; and medical vacuum plants
- Source and main valves to isolate each source and the main line
- Risers and branch piping – medical gas piping is cleaned for oxygen service, brazed and labeled
- Zone valve boxes outside each zone so staff can shut off gas in an emergency
- Alarms – master alarms for sources and main lines, area alarms for critical zones
- Outlets and inlets – gas-specific connectors at each point of use
Installation, testing and verification
New or modified pipelines go through a defined sequence:
- Installer testing – initial blowdown, pressure tests, cross-connection testing, piping purge and standing pressure tests
- Independent verification – a qualified verifier checks cross-connections, alarms, valve labeling, purity, pressures and flows before the system is used on patients
- Documentation – results are recorded and kept for the facility
Learn more on our medical gas installation and testing and inspection pages.
Operating and maintaining the pipeline
- Keep zone valve boxes accessible, labeled with the areas they serve, and unobstructed
- Test alarms periodically and respond to every alarm condition
- Inspect outlets for leaks, latching and flow
- Maintain source equipment on a preventive maintenance schedule
- Control shutdowns with a written procedure and staff notification
- Re-verify any section that’s modified or opened
Planning renovations and expansions
Adding rooms or remodeling a department usually means tying into existing lines, which may require shutting down part of the system. Good planning includes confirming source capacity for the added load, scheduling shutdowns, arranging temporary supply if needed, and verifying the modified section before use.
FAQs
Who can work on medical gas piping?
Medical gas pipeline installation and brazing must be done by qualified, certified personnel, and verification by a qualified independent verifier, per NFPA 99. Facilities should confirm qualifications before work starts.
Why are medical gas pipes cleaned for oxygen service?
Oil, grease and debris can ignite in high-oxygen environments. Pipe and fittings for medical gas are cleaned and capped to keep contaminants out.
What gases are delivered by a medical gas pipeline?
Commonly oxygen, medical air, nitrous oxide, nitrogen, carbon dioxide, medical-surgical vacuum and WAGD, depending on the facility.
Need pipeline components, a tie-in or system service in Southern California? Call Medical Gas Resources at 714-897-7530.
