Gases Used Commonly –O 2 –N 2 O Less commonly –CO 2 –Medical Air
GAS BOTTLES How full is the bottle? N 2 O 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.
Preventing wrong connections For small cylinders –Special pin placements on connecting yoke For large cylinders –Differing screw diameters
GAS BOTTLES Regulators Bottle pressure Output 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