gas bottles prepare and monitor anaesthesia in animals gas bottles
TRANSCRIPT
GAS BOTTLES
Prepare and monitor anaesthesia in animals
GAS BOTTLES
GAS BOTTLES
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Gases Used
• Commonly– O2
– N2O
• Less commonly– CO2
– Medical Air
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How full is the bottle?
• N2O gauge is deceptive (since pressure constant until fully empty)
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Bottle Hazards
• Falling of unsecured cylinders may lead to: – Direct injury of personnel. – Explosive decompression if the valve breaks off, which will
turn the cylinder into a lethal projectile– These hazards mandate that all cylinders be secured to a
wall or placed on special carts.
• Fires and explosions may be caused by the oxidizing ability of oxygen and nitrous oxide: no grease must used in the threads of the valves or connectors.
• Incorrect identification of the contents of cylinders is a potential hazard.
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Bottle Contents by Colour
O2Air N2O CO2
white
black&
white
black&
white blue grey
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N2O
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Preventing wrong connections
• For small cylinders– Special pin placements on connecting
‘yoke’
• For large cylinders– Differing screw diameters
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RegulatorsBottle pressureOutput pressure
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Regulators – 2 functions
1. Maintain constant pressure in outflow line (i.e. regulate pressure)
2. Show pressure in tank (+/- outflow line)
– +/- show pressure in line (models with a second gauge)
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Regulator
• Converts high cylinder (up to 2000 psi) pressure to a safer hose pressure (50-55 psi)– Keeps a steady flow as pressure in bottle
drops
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Connecting to Cylinders
• Attach regulator
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FYI – Some Conversions
50 psi = 345 kPa
2,000 psi = 13,790 kPa
(1 psi = 6.8947573 kPa)
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Connecting to CylindersConnecting to Cylinders
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Connecting to CylindersConnecting to Cylinders
1.Tightened by hand
1.Tightened by hand
2. Then tap opened
2. Then tap opened
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Opening tap
• Never open tap / hosewheel unless regulator is connected
• Either– 2 full turns, or– Fully open, then turn back ½ rotation
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When connecting O2 cylinder…
• No naked flames (no smoking)
• No grease/oil on connections
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When bottle empty…
• Leave some oxygen in bottle– Reduces moisture entering
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Moving cylinder
• Use trolley for moving larger sizes
• Ensure always well-secured when transporting by vehicle
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The End