Overview of ANSI / ASME Pipe Marking Standards

ComplianceSigns.com offers an extensive selection of pipe marking labels, stencils, wraps, tapes and valve markers. This article offers an overview of ANSI/ASME pipe marking standards for hazardous materials. For complete specifications, consult the ASME A13.1-2007 Standard.

The ASME A13.1 standard provides a system to identify hazardous materials transported in above-ground piping systems, as well potential hazards if the contents were released into the environment. It’s commonly used in industrial and power plants, but is also recommended for use in commercial and institutional buildings and those used for public assembly. Pipe labels can be invaluable in an emergency situation, and will also help you comply with A13.1 standards.

Common Pipe Markers

Yellow and Black Label for Pipes Carrying Hydraulic OilBlack and Yellow Pipe Marker with Arrow for HydrogenBlack and Orange High Voltage Pipe Label

Label Placement

According to ANSI/ASME pipe marking standards, labels should be positioned on pipes so they can be easily read. Labels are required at the following locations:
– Near valves and flanges
– Where direction changes
– On both sides of walls or floors the pipe passes through
– At regular intervals on straight runs, spaced for easy identification

Label Content

Pipe marking labels must effectively communicate the contents of pipes and give additional detail of any special hazards, such as pressures or extreme temperatures. ANSI/ASME pipe marking standards call for pipe labels to indicate both the content of the pipe and its direction of flow. Arrows at one or both ends indicate flow. Text and a standard color scheme indicate pipe contents. If contents can flow both directions, arrows in both directions shall be displayed.

Label Color

The current version of the ANSI / ASME code uses a color scheme with six standard color combinations and four user-defined combinations, based on the contents of the pipe. In general, the most hazardous feature of the contents should determine the color used. ANSI Z535.1 specifies exact safety colors for pipe labels.

Previous editions of the pipe-labeling code used a four-color scheme. The 2007 code applies only to new facilities; new labels in existing facilities should conform to the label scheme already in use to avoid confusion.

Note: This chart is presented for reference use only. For complete specifications, consult the ASME A13.1 Standard.


Like this Information?

Subscribe to our newsletters to receive workplace safety updates, new product info and special discounts.

Subscribe Here