Color codes are, in some cases, applied on pipes and other piping materials (such as pipe fittings, flanges, and valves) to facilitate the identification, in the storage warehouse or on the field during project execution, of components manufactured in different materials.
PFI ES-22 SPECIFICATION FOR PIPE COLOR CODING
The table shows the pipe color coding guidelines set by the PFI ES 22 specification. In addition to the colors specified in the table,welded pipesshall show an additional white stripe.
PFI Standard ES-22 Standard: Pipe Color Coding Recommendations |
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Carbon Steel Pipes |
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| Material | Material Garde | Band / Strip Color |
| Carbon Steel, Electric Resistance Welded Pipe | A53 Gr. B/API | 1solid white |
| Carbon Steel, Smls, specified tensile strength under 70,000 psi (483 MPA) | A53 Gr. B | No Marking |
| Carbon Steel, killed steel | A106 Gr. B | 1solid green |
| Carbon Steel, specified tensile strength 70,000 psi (483 MPA) and over | A106 Gr. C | 2 solid green |
| Carbon Steel, low temperature (impact tested) | A333 Gr. 6 | 1solid red |
High Yield Carbon Steel Pipes |
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| 52,000 min. yield | API 5L X-52 | 1solid yellow, 1 solid green |
| 60,000 min. yield | API 5L X-60 | 1solid yellow, 1 solid pink |
| 65,000 min. yield | API 5 l x - 65 | 2 solid yellow |
| 70,000 min. yield | API 5L X-70 | 1solid yellow, 1 solid orange |
Low Alloy Pipes |
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| C-Mo steel | A335 Gr. P1 | 1solid orange |
| 1Cr-1/2 Mo Steel | A335 Gr. P12 | 1solid orange, 1 solid blue |
| 11/4 Cr-1/2 Mo Steel | A335 Gr. P11 | 1solid yellow |
| 2 1/4 Cr-1 Mo Steel | A335 Gr. P22 | 1solid blue |
| 5 Cr-1/2 Mo Steel | A335 Gr. P5 | 1solid blue, 1 solid yellow |
| 9 Cr-1/2 Mo Steel | A335 Gr. P9 | 2 solid orange |
Ferritic and Martensitic Pipes and Tubes |
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| 405型 | A268 TP405 | 1solid green, 1 solid black |
| Type 410 | A268 TP410 | 1solid green, 1 solid red |
Austenitic Stainless Steel Pipes |
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| Type 304 | A312 TP304 | 1solid black |
| Type 304L | A312 TP304L | 2 solid black |
| Type 304H | A312 TP304H | 1intermittent black |
| Type 309 | A358 Gr309 | 1solid black, 1 solid brown |
| Type 310 | A358Gr310 | 1solid green, 1 solid orange |
| Type 316 | A312 TP316 | 1solid gray |
| Type 316L | A312 TP316L | 2 solid gray |
| Type 316H | A312 TP316H | 1intermittent gray |
| Type 317 | A312 TP317 | 1solid brown, 1 solid green |
| Type317L | A312 TP317L | 1solid brown, 1 solid red |
| Type 321 | A312 TP321 | 1solid pink |
| Type 321 H | A312 TP321H | 2 solid pink |
| Type 347 | A312 TP347 | 1solid brown |
| Type 347H | A312 TP347H | 2 solid brown |
Nickel-Alloy Pipes |
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| Nickel 200 | 1solid black, 1 solid pink | |
| Incoloy 800 | 1solid black, 1 solid orange | |
| Incoloy 800H | 1solid gray, 1 solid red | |
| 因科镍铬不锈钢825 | 1solid gray, 1 solid blue | |
| Inconel 600 | 2 solid blue | |
| Inconel 625 | 1solid blue, 1 solid pink | |
| Hastelloy Alloy 8-2 | 1solid red, 1 solid orange | |
| Hastelloy Alloy C-276 | 1solid red, 1 solid blue | |
| Hastelloy Alloy C-22 | 2 solid red | |
| Hastelloy Alloy G | 1solid red, 1 solid yellow | |
| Carpenter Alloy 20 C 8-3 | 1solid black, 1 solid blue | |
| Monel 400 | 1solid black, 1 solid yellow | |
ASME A13.1 PIPING COLOR-CODING (BY TYPE OF FLUID)
The ASME A13.1 specification provides indications about the color coding of piping materials that transport different types of hazardous fluids. In this specification, fluids are classified in the following way:
- Flammable fluids: fluids an vapors that may ignite and burn in the air
- Fire-quenching fluids: as water, foam, and CO2 used in sprinkler systems and firefighting systems
- Toxic and corrosive fluids: media that are corrosive or toxic
- Combustible fluids (not flammable)
- Oxidizing fluids (gas or liquid that may contribute to the combustion of other materials when combined with oxygen)
- Compressed air
The table shows the color to be applied on the outer surface of the pipe depending on the type of transported fluid.
The Norm sets also requirements in terms of length and height of the color mark depending on the pipe outside diameter.
TheBS 1710 specificationsets similar indications, with a slightly different pipe color marking approach.
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