Pipe Marking - British Standards
| SERVICE | BASIC COLOUR | COLOUR CODE ID | |||
| Water | |||||
| Drinking | Green | Auxiliary Blue | |||
| Cooling | Green | White | |||
| Boiler Feed | Green |
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| Condensate | Green |
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| Chilled | Green |
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| Central Heating < 100°C | Green |
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| Central Heating > 100°C | Green |
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| Cold, Down Service | Green |
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| Hot Water Supply | Green |
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| Hydraulic Power | Green | Salmon Pink | |||
| Sea, River Untreated | Green | ||||
| Fire Extinguishing | Green | Safety Red | |||
| Oils | |||||
| Diesel Fuel | Brown | White | |||
| Furnace Fuel | Brown | Brown | |||
| Lubricating | Brown | Emerald Green | |||
| Hydraulic Power | Brown | Salmon Pink | |||
| Transformer | Brown | Crimson | |||
| Refrigeration Service | |||||
| Refrigerant 12 | Ochre | Blue | |||
| Refrigerant 22 | Ochre | Green | |||
| Refrigerant 502 | Ochre | Brown | |||
| Anhydrous Ammonia | Ochre | Dark Mauve | |||
| Other Refrigerants | Ochre | Emerald Green | |||
| Other Applications | |||||
| Natural Gas | Ochre | Yellow | |||
| Compressed Air | Light Blue | Light Blue | |||
| Vacuum | Light Blue | White | |||
| Steam | Silver Grey | Silver Grey | |||
| Drainage | Black | Black | |||
| Electrical Conduits/Ducts | Orange | Orange | |||
| Acids and Alkalis | Violet | Violet | |||
The Health and Safety (Safety Signs & Signals) Regulations 1996 require employers to properly mark visible pipes in the workplace which contain or transport dangerous substances. Using colour to identify the contents of pipes, conduits, and ducts should follow the British Standard BS 1710. Standardization of pipe marking will avoid possible confusion, injury, and other hazardous incidents.
Pipework markers shall be applied at the following locations:
- On all pipework leading into and away from a manifold system.
- Within one metre of pipework passing through a wall, bund wall, boundary fence or other barrier, or entering the ground.
- On all pipework in a loading gantry, adjacent to the main control valve or flow meter for each pipe.
- Within one metre of hose connection points. On long runs of pipelines at intervals not exceeding 50 metres where the pipeline is visible along its length, otherwise at 8 metres.
- On long runs of pipelines that travel from grade up into elevated pipe racks, markers shall be fitted to the individual lines at the point that the lines rise into the rack and then at the point the lines come down from the rack.
- On the suction and discharge piping adjacent to any pump.
- At tee connections, valves, and any other point where identification would be required in normal operation.
- Where pipework enters or exits a tank.
- At any point where identification is required in an emergency or of a hazard.
The following table specifies the colours to be used to identify pipelines and services in accordance with BS1710: 1984.
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