ANSI Color Codes

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3/10/2553

ANSI Color Codes

ANSI Color Codes
Why are the ANSI color codes important? What does the yellow background mean? The yellow background signifies that the piping may handle hazardous material. Unfortunately, much has changed in the typical plant over the last 70 years since this standard was originally conceived. The basic standard can be traced to the 1920's and use in the US military. Obviously, our definitions for what is "hazardous" has changed. Water, air or carbon dioxide, under certain situations (pressure, heat, mixture with other chemicals) are not always benign. How do we interpret, for example, materials that should be used for "fire quenching" that are also "hazardous"? Should we use the red or the yellow ANSI scheme? Or, how do we label a pipe that carries both the liquid (which should be green) and gas form of a chemical (which should be blue)? Hazards, in other words, are not so easily defined. "Hazardous" may mean that the material is hazardous to a person nearby, or to the operation of the overall plant itself. Could "hazardous" mean that the materials flowing through the process piping, if not handled carefully, could contaminate the product. Or, if leaked into the atmosphere, could the chemical infect the environment or cause damage to employees after cumulative exposure over a period of years? Clearly, the ANSI standard was written for far simpler times. Color Red Yellow Orange Blue Green Red Orange Yellow Blue Brown Green Red Orange Yellow Blue Green Red Yellow Blue Std APWA APWA APWA Meaning Example

Electric Power Lines, Cables, Conduit Buried High Voltage Line and Lighting Cables Gas, Oil, Steam, Petroleum or Gaseous Materials Communication, Alarm or Signal Lines, Cables or Conduit Natural Gas Distribution Line Buried Fiber Optic Cable Buried Water Line Buried Storm Sewer Line STOP, Yield Construction Zone Ahead Merge Ahead, Slow Hospital Picnic Area Ahead Exit 1 Mile, Go Hazardous Voltage Will Cause Death Hazardous Voltage May Cause Death Turn Machine Off When Not In Use Employees Only Wear Ear Plugs Fire Protection Water Chlorine Compressed Air

APWA Water, Irrigation and Slurry Lines APWA Sewers, Drain Line Traffic Traffic Traffic Traffic Traffic Traffic ANSI Sign ANSI Sign ANSI Sign ANSI Sign ANSI Sign ANSI Pipe ANSI Pipe ANSI Prohibition Temporary Work Zone Caution Information Signs Historical or Park Directional Signs Danger Signs, Highest Hazard Warning Signs, Medium Hazard Caution Signs, Lowest Hazard Notice Signs Safety First Signs Fire Quenching Materials Materials Inherently Hazardous Materials of Inherently Low Hazard,

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Blue Green Blue/Red/Yellow

Pipe ANSI Pipe NFPA 701

ANSI Color Codes Gas
Materials of Inherently Low Hazard, Liquid

Compressed Air Storm Drain

Blue is used for Health Hazards, Red for Flammability and Yellow for reactivity

Variations in color-coding standards are inevitable in our complex plant and pluralistic society. While laudable, harmonization of color-codes, then, will be very difficult to achieve. Many plants use other color-coding; for example, color-code each system (i.e. Lube Oil is brown, Condensate is green, etc.>) or color code by Unit (i.e. Unit 1 is yellow, Unit 2 is blue, etc.). For most plants, we recommend either the ANSI pipe marker color codes or simply black on yellow markers. For more complex plants, we recommend a color-coding by system. For all environments, we recommend the inclusion of RTK information on the valve or on the pipe. ANSI Color Code for Thermocouple and Thermocouple Extension Wire ANSI Symbol J K T E N RSX BX W3X W5X Thermocouple Wire Color Wire Alloys Iron Constantan(TM) CHROMEL®* ALUMEL®* Copper Constantan(TM) CHROMEL®* Constantan(TM) Nicrosil(TM) Nisil(TM) Copper Copper Alloy PCLW630/Copper Copper Alloy 203; Alloy 405 Alloy 225; Alloy 426 Polarity +JP -JN +KP -KN +TP -TN +EP -EN +NP -NN +RSP -RSN +BP -BN +WP -WN Individual White Red Yellow Red Blue Red Purple Red Orange Red Jacket Brown Brown Brown Brown Brown T/C Extension Wire Color Individual White Red Yellow Red Blue Red Purple Red Orange Red Black Red Grey Red White/Red Red Jacket Black Yellow Blue Purple Orange Green Grey White/Red

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* CHROMEL® and ALUMEL® are registered rademarks of Hoskins Manufacturing Company. PMC Corporation reserves the right to substitute equivalent product to CHROMEL® and ALUMEL® at any time. For additional information see Bare Wire Data Sheet

© 2006 Pro-Tech Sy stems Group. A ll rights reserv ed. Terms of Use.

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