![]() It uses a color code chart with six standard color combinations and four user-defined combinations as shown below. If flow can be in both directions, arrows in both directions should be displayed.ĪSME A13.1 was last updated in 2015. An arrow should be used in conjunction with the legend to show which direction the material flows. For example, the legend "Steam 100 PSIG" specifies the contents as well as the additional pressure hazard. The legend should be short in length and easy to understand. Pipe marking labels must effectively communicate the contents of the pipes and give additional detail if special hazards (such as extreme temperatures or pressures) exist. This standard does not apply to buried pipelines or electrical conduit. The American Society of Mechanical Engineers (ASME) A13.1 Scheme for the Identification of Piping Systems standard addresses pipe marking by offering a common labeling method for use in all industrial, commercial and institutional facilities as well as in buildings used for public assembly. Just like hazardous materials in other containers, piping systems should be appropriately labeled. Hazardous materials flow through miles of piping in a wide variety of facilities. ![]()
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