2'x4" (2 feet x 4 inches)

5000 cc (5 L)

Used for bulk storage

4' x 9" (4 feet x 9 inches)

Designed to withstand approximately 2x their working pressure

Wall thickness is specified according to the pressure the tank must withstand 

32 grams/mole

Boiling point is -183 degrees C

Critical Point is -118 degrees C

1900-2200 psi

660 L of O₂ in full tank 

B/C O2 must exist as a gas at room temp, the tank pressure is proportional to tank content 

By fractional distillation of air 

Contain a very low water content (0% relative humidity)

Tank color in US is green

44 grams/mole

Boiling point -88 degrees C 

Critical Temperature is 36.5 

This is why it is a liquid in our tanks 

90-95% liquid 

1590 L (Full Cylinder)

745 psi will be the tank pressure until all the liquid N₂O is vaporized

253 L or 16% of full tank volume (gas) 

Removing N₂O at rates 4L/min or greater can result in cooling and pressure loss- may freeze regulator

Cooling is the result of expansion of the gas as the required heat of vaporization 

Thermal decomposition on ammonium chloride 

Supports combustion 

Tanks are colored blue 

78% N₂O, 21% O₂, 1% Argon, and trace gases

Compressed air constains a considerable about of water vapor

1900-2200 psi

Follows Boyle's Law as gas is removed

Working pressure of tank marked

Tanks tested every 10 years to 1.66x working pressure marked on tank

Fusible metal alloy

Frangible disk

Safety Relief Valve

Located in cylinder valve

Valve is reclosable 

Pin-Index-Safety-System 

(PISS)

Yoke assembly has pins placed in specific positions to prevent improper tank placement

Six pin position (Right to Left is 1-6)

Also used by gas suppliers when filling the tanks

Pressure gauge

Filter

PISS

Clamping Device

Permanent Identification Markings 

Gas color code

Check Valve- to prevent cross filling

Yoke Plug 

Upright position

Cool, dry, fire resistant room

Valves open slowly

170 of 14500 tanks probably have dangerous irregularities 

Small hospital can use 2 banks

Use exceeds 100,000L/week then economical to use liquid O₂

Must be two central supply systems

Requires that reserve be present for one full day of use

Liquid O2 is boiled off- heated and piped to various hospital locations

One ft³ of liquid O₂ evolves 860 ft³ of O₂ gas 

~24,338 L of O₂

Cost effective

O₂ boils off and must be vented to prevent pressure accumulation

Low Liquid Alarm

High and Low pressure alarms 

Stored in H-cylinder banks with automatic cross over system 

50 psi regulator

Potential to deliver hypoxic gas mixture when N₂0 banks are switched as a result of increased delivery pressure 

Must be able to remove 99 L/m

Traps are placed to collect solid and liquid contaminants 

ORs have separate vaccum system used exclusively for the removal of anesthetic gases

This system should not be used as central vaccum system as it may lack traps needed to collect contaminants