Gas cylinder

Made of

• High tensile steel or aluminium alloy.

Storage

• Most stored upright
• Entonox horizontally

Colour code

• Oxygen: black with a white top
• Nitrous oxide: blue
• CO2: grey

Other trivials

• Shape and colour of plastic disc around top indicate the year last examined
• Test every 5-10 years
• Can withstand 65-70% above working pressure
• Minimum ultimate tensile strength of aluminium - 350MPa
• O2 cylinder = 138bar and 10L in volume
  --> thus 1380L in cylinder.
  * 1370L available (last 10L stay in)
• Hospital gas pipeline = 4 ATA
• N2O cylinder pressure = 5000kPa at 37C
  * (all gaseous)