 Cylinder Markings
What do cylinder markings mean? This diagram should help explain.
Government Approval – The DOT specifications is a countries mark that the cylinder meets the countries specifications for cylinders. For us in the UK this should read EN144/BS, they should also have a CE stamp.
Metal Type – This section notes the type of metal the cylinder is made from, for instance 3A stands for carbon steel. This marking is important for those testing the cylinder
Working Pressure – An important mark, this indicates the cylinders maximum working pressure, this can sometimes be in bar or psi, in this instance the cylinder marking indicates the cylinder can hold 2250 psi.
Serial Number – A unique serial number which all scuba cylinders carry, made up of lot number and size.
Manufacturer Identification – This is usually after the serial number and indicated the manufacturer. Examples of manufacturers would be faber, luxfer and PST.
Hydrostatic Test Date – This will show the last date that the cylinders hydrostatic test was done on. When its re-tested a stamp will be added to the cylinder indicating the last date. So if the cylinder is over 2 and a half years old look for the stamps.
source:simplyscuba.com
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