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9 Cards in this Set

  • Front
  • Back
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
2. An absolute pressure > 104psi @ 130 F
3. Any liquid having a vapor press > 40 psi @ 100 F
Compare and contrast the physical state each medical gas is stored in:
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)

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