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### 9 Cards in this Set

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 Identity compressed gases by cylinder color & calc vol based on cylinder size Green = O2 - 2000psig @ 660L (E cylinder) Blue = N2O - 745psig @ 1590L (E cylinder), 940L (D cylinder) Yellow = Air Gray = CO2 - 838psig @ 1590L (E cylinder) Black = N2 Brown = Helium Black/White = Int’l Air White = Int’l O2 Physical Properties of compressed gases: Any non-liquefied material in a container having: 1. An absolute pressure > 40psi @ 70 F OR 2. An absolute pressure > 104psi @ 130 F OR 3. Any liquid having a vapor press > 40 psi @ 100 F Compare and contrast the physical state each medical gas is stored in: O2 Gas at Room Temp Critical temp = -119 C Cannot be liquefied @ room temp no matter how much press is applied to it Can become a liquid @ very low temperatures (cryogenic liquid) N2O Stored as a liquid Critical temp = 39.5 C Pressure CAN be applied to liquefy N2O at room temp Definition of Critical Temp? * Critical Temp = The temp above which a substance goes into gaseous form in spite of how much pressure is applied Safety measures for handling cylinders: Store upright in racks, cool, well-ventilated Store same gases together Temp never >130 F Keep empty and full tanks separate Cover valve stem w/protective cap No transfilling (refilling smaller tanks via big tank) Remove plastic covering before installing Lift by cylinder body, not by valve stem Regulatory agencies, codes, and standards: Production, supply and transport regulated Purity specifications for gases regulated by Pharmacopoeia of US/FDA Department of Transportation: manufacturing, marking, labeling, transport, filling, and maintenance of cylinders OSHA, NFPA, CGA – standards voluntary but regulatory agencies make them mandatory (JACCHO) JACCHO made regulations mandatory for accreditation Cylinder testing: Inspected and pressure tested every 5 yrs Checked for leaks and structure strength w/1.6x normal service pressure (3100psi) Test date stamped permanently on cylinder DOT regulations limit amt of pressure cylinder may contain (marked on cylinder) Permanent Markings: DOT (Dept of Transportation) requires: Stamped on shoulder Specification # indicates what material is made of Service pressure – lbs/sq.inch Serial # and symbol of manufacturer Indicators mark, test date Tare wt – wt when tank empty (7kg) for an E size cylinder Pin Index Safety System: Used on E size cylinders and smaller Developed in 1952 as safety measure 2 holes in cylinder valve stem 7 possible locations O2 – 2 & 5 position N2O – 3 & 5 position Air – 1 & 5 position Attaches to corresponding pins in machine yoke