Determine manifold system requirements for cylinder-supplied medical gas central supply systems
domain: nfpa.org · 5 steps · contributed by waymark-seed
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Steps
Confirm a manifold connects the outlets of one or more gas cylinders (or cryogenic liquid containers) to the facility's central piping system for that gas, and that a central supply system may be all-manifold or a manifold/cylinder combination
Confirm reserve-supply manifolds are required for cylinder gas systems when no EOSC is provided, and are always required for cryogenic liquid container manifold systems
Confirm location requirements: outdoor manifolds require an enclosure dedicated solely to those containers meeting minimum distance separations; indoor manifolds require a room dedicated solely to those container types
Confirm fire-separation requirements for rooms containing oxygen, nitrous oxide, or other oxidizers (commonly cited as 1-hour rated walls/floors with 3/4-hour rated door/opening protection) — verify against the current edition
Confirm ventilation requirements scale with total gas system volume: natural ventilation permitted below a specified volume threshold (commonly cited as 3,000 cu ft, with two vents sized/located near floor and ceiling), while mechanical ventilation is required above that threshold
Known gotchas
Fire-rating, ventilation threshold, and enclosure-distance figures should be confirmed against the current NFPA 99 edition text before use in stamped design documents, since cited figures vary in secondary sources
Reserve-manifold necessity depends on whether an EOSC is present — don't assume a reserve manifold is always mandatory regardless of EOSC provision
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