GAS BOTTLES

Prepare and monitor anaesthesia in animals

GAS BOTTLES

GAS BOTTLES

GAS BOTTLES

Gases Used

• Commonly– O2

– N2O

• Less commonly– CO2

– Medical Air

GAS BOTTLES

How full is the bottle?

• N2O gauge is deceptive (since pressure constant until fully empty)

GAS BOTTLES

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.

GAS BOTTLES

GAS BOTTLES

Bottle Contents by Colour

O2Air N2O CO2

white

black&

white

black&

white blue grey

GAS BOTTLES

GAS BOTTLES

N2O

GAS BOTTLES

Preventing wrong connections

• For small cylinders– Special pin placements on connecting

‘yoke’

• For large cylinders– Differing screw diameters

GAS BOTTLES

RegulatorsBottle pressureOutput pressure

GAS BOTTLES

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)

GAS BOTTLES

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

GAS BOTTLES

Connecting to Cylinders

• Attach regulator

GAS BOTTLES

FYI – Some Conversions

50 psi = 345 kPa

2,000 psi = 13,790 kPa

(1 psi = 6.8947573 kPa)

GAS BOTTLES

Connecting to CylindersConnecting to Cylinders

GAS BOTTLES

Connecting to CylindersConnecting to Cylinders

1.Tightened by hand

1.Tightened by hand

2. Then tap opened

2. Then tap opened

GAS BOTTLES

Opening tap

• Never open tap / hosewheel unless regulator is connected

• Either– 2 full turns, or– Fully open, then turn back ½ rotation

GAS BOTTLES

When connecting O2 cylinder…

• No naked flames (no smoking)

• No grease/oil on connections

GAS BOTTLES

When bottle empty…

• Leave some oxygen in bottle– Reduces moisture entering

GAS BOTTLES

Moving cylinder

• Use trolley for moving larger sizes

• Ensure always well-secured when transporting by vehicle

GAS BOTTLES

The End