ANSI Color Codes
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ANSI Color Codes http://www.pteinc.com/color.html[11/28/2012 2:31:31 PM] 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 Std Meaning Example Red APWA Electric Power Lines, Cables, Conduit and Lighting Cables Buried High Voltage Line Yellow APWA Gas, Oil, Steam, Petroleum or Gaseous Materials Natural Gas Distribution Line Orange APWA Communication, Alarm or Signal Lines, Cables or Conduit Buried Fiber Optic Cable Blue APWA Water, Irrigation and Slurry Lines Buried Water Line Green APWA Sewers, Drain Line Buried Storm Sewer Line Red Traffic Prohibition STOP, Yield Orange Traffic Temporary Work Zone Construction Zone Ahead Yellow Traffic Caution Merge Ahead, Slow Blue Traffic Information Signs Hospital Brown Traffic Historical or Park Picnic Area Ahead Green Traffic Directional Signs Exit 1 Mile, Go Red ANSI Sign Danger Signs, Highest Hazard Hazardous Voltage Will Cause Death Orange ANSI Sign Warning Signs, Medium Hazard Hazardous Voltage May Cause Death Yellow ANSI Sign Caution Signs, Lowest Hazard Turn Machine Off When Not In Use Blue ANSI Sign Notice Signs Employees Only Green ANSI Sign Safety First Signs Wear Ear Plugs Red ANSI Pipe Fire Quenching Materials Fire Protection Water Yellow ANSI Pipe Materials Inherently Hazardous Chlorine Blue ANSI Pipe Materials of Inherently Low Hazard, Gas Compressed Air Green ANSI Pipe Materials of Inherently Low Hazard, Liquid Storm Drain
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Transcript of ANSI Color Codes
ANSI Color Codes
http://www.pteinc.com/color.html[11/28/2012 2:31:31 PM]
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 thetypical plant over the last 70 years since this standard was originally conceived. The basic standard can be traced to the1920's and use in the US military. Obviously, our definitions for what is "hazardous" has changed. Water, air or carbondioxide, under certain situations (pressure, heat, mixture with other chemicals) are not always benign. How do weinterpret, for example, materials that should be used for "fire quenching" that are also "hazardous"? Should we use thered or the yellow ANSI scheme? Or, how do we label a pipe that carries both the liquid (which should be green) andgas 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 personnearby, or to the operation of the overall plant itself. Could "hazardous" mean that the materials flowing through theprocess piping, if not handled carefully, could contaminate the product. Or, if leaked into the atmosphere, could thechemical 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 Std Meaning Example
Red APWA Electric Power Lines, Cables,Conduit and Lighting Cables Buried High Voltage Line
Yellow APWA Gas, Oil, Steam, Petroleum orGaseous Materials
Natural Gas DistributionLine
Orange APWA Communication, Alarm or SignalLines, Cables or Conduit Buried Fiber Optic Cable
Blue APWA Water, Irrigation and Slurry Lines Buried Water Line
Green APWA Sewers, Drain Line Buried Storm Sewer Line
Red Traffic Prohibition STOP, Yield
Orange Traffic Temporary Work Zone Construction ZoneAhead
Yellow Traffic Caution Merge Ahead, Slow
Blue Traffic Information Signs Hospital
Brown Traffic Historical or Park Picnic Area Ahead
Green Traffic Directional Signs Exit 1 Mile, Go
Red ANSISign Danger Signs, Highest Hazard Hazardous Voltage Will
Cause Death
Orange ANSISign Warning Signs, Medium Hazard Hazardous Voltage May
Cause Death
Yellow ANSISign Caution Signs, Lowest Hazard Turn Machine Off When
Not In Use
Blue ANSISign Notice Signs Employees Only
Green ANSISign Safety First Signs Wear Ear Plugs
Red ANSIPipe Fire Quenching Materials Fire Protection Water
Yellow ANSIPipe Materials Inherently Hazardous Chlorine
Blue ANSIPipe
Materials of Inherently Low Hazard,Gas Compressed Air
Green ANSIPipe
Materials of Inherently Low Hazard,Liquid Storm Drain
ANSI Color Codes
http://www.pteinc.com/color.html[11/28/2012 2:31:31 PM]
Blue/Red/Yellow NFPA701
Blue is used for Health Hazards, Red for Flammability andYellow 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 yellowmarkers. For more complex plants, we recommend a color-coding by system. For all environments, we recommend theinclusion of RTK information on the valve or on the pipe.
ANSI Color Code for Thermocouple and Thermocouple Extension Wire
ANSISymbol Wire Alloys Polarity
ThermocoupleWire Color
T/C Extension WireColor
Individual Jacket Individual Jacket
J IronConstantan(TM)
+JP-JN
WhiteRed Brown White
Red Black
K CHROMEL®*ALUMEL®*
+KP-KN
YellowRed Brown Yellow
Red Yellow
T CopperConstantan(TM)
+TP-TN
BlueRed Brown Blue
Red Blue
E CHROMEL®*Constantan(TM)
+EP-EN
PurpleRed Brown Purple
Red Purple
N Nicrosil(TM)Nisil(TM)
+NP-NN
OrangeRed Brown Orange
Red Orange
RSX CopperCopper Alloy
+RSP-RSN - - Black
Red Green
BX PCLW630/CopperCopper
+BP-BN - - Grey
Red Grey
W3XW5X
Alloy 203; Alloy405
Alloy 225; Alloy426
+WP-WN - - White/Red
Red White/Red
* CHROMEL® and ALUMEL® are registered rademarks of Hoskins Manufacturing Company. PMC Corporation reserves the right to substitute equivalent product toCHROMEL® and ALUMEL® at any time.For additional information see Bare Wire Data Sheet
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