Pipe Markers
Colour-coded pipe markers that tell maintenance crews, contractors and first responders what is inside a pipe and which way it is flowing — before anyone opens a valve. Every marker follows the ASME A13.1 colour scheme and size table, is printed to order in Brantford, Ontario, and ships with detachable flow arrows. Free design on every order, including custom legends.
Choose by colour class
| Colours | Pipe contents (ASME A13.1) | Typical legends |
|---|---|---|
| Black on Yellow | Flammable & oxidizing fluids | Natural Gas, Propane, Hydrogen, Oxygen, Steam |
| Black on Orange | Toxic & corrosive fluids | Ammonia, Chlorine, Sulphuric Acid, Caustic |
| White on Red | Fire quenching fluids | Fire Sprinkler, Fire Standpipe, Foam |
| White on Green | Potable, cooling, boiler feed & other water | Domestic Cold Water, Chilled Water Supply, Process Water |
| White on Blue | Compressed air | Compressed Air, Instrument Air, Breathing Air |
| White on Brown | Combustible fluids | Diesel Fuel, Hydraulic Oil, Lube Oil |
| Purple, Grey, Black, White | User-defined — fluids your facility classifies | Any legend you specify |
Pick the right size
Measure the outside diameter of the pipe, including insulation. Larger pipes need longer markers and taller letters to stay readable from the floor.
| Size | Pipe outside diameter | Marker length | Letter height | Pack of 10 |
|---|---|---|---|---|
| A | 3/4" to 1-1/4" | 8" | 1/2" | $35.00 |
| B | 1-1/2" to 2" | 8" | 3/4" | $39.00 |
| C | 2-1/2" to 6" | 12" | 1-1/4" | $49.00 |
| D | 8" to 10" | 24" | 2-1/2" | $99.00 |
| E | Over 10" | 32" | 3-1/2" | $129.00 |
Where markers go
- Next to every valve and flange
- At every change of direction and every branch
- On both sides of wall, floor and ceiling penetrations
- At regular intervals on straight runs — we recommend every 20 ft (6 m)
- Wherever the marker is readable from the normal line of sight
Built to stay on the pipe
Full-colour print on industrial-grade adhesive vinyl with a protective overlaminate that resists oil, chemicals, abrasion, UV and graffiti. Rated for indoor and outdoor use. Each pack contains 10 markers of one legend, with flow arrows.
Marking a whole facility?
Send us your P&IDs, a line list, or just photos of the mechanical room. We will build the legend schedule, quantities and sizes, and quote the full project — French, bilingual and CAN/CGSB-24.3 schemes included. Call 1-855-919-9392 or email info@cyanvis.com.
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