A widely used British Standard (BS) for marking equipment is:
* BS 1710:2019 Graphical symbols — Safety colours and safety signs — Registered safety signs
The Standard stipulates the colours to be used. These are as follows:
In addition to the basic colours, certain safety colours are used:
The arrangement of markings is for the safety colour to be between bands of the basic colour.
Firewater service would be:
The pipe contents must be identified adjacent to the banding. This can be done by giving either:
* The full name
* Abbreviation
* Chemical symbol
* Refrigerant number
* Coloured bands (user specified)
The direction of flow should also be identified near the banding.
Examples using this system are as shown.