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Ammonia Pipe Marking

Improve the safety of complex ammonia refrigeration systems with ammonia pipe marking. In this 10-minute webinar, Compliance Specialist Brian McFadden will explain the latest guidelines from the International Institute of Ammonia Refrigeration (IIAR), elements of a typical ammonia pipe marking label, and solutions to streamline the label process.

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Last presented on: 02 28, 2018

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Contents of the Ammonia Pipe Marking Webinar:


The following is an excerpt from the Ammonia Pipe Marking Webinar transcript:

Pipe Marking Standards

The International Institute of Ammonia Refrigeration, or IIAR, provides a voice for these expert recommendations. Last updated in April 2014, the IIAR Bulletin No. 114 standard offers a uniform system for labeling ammonia refrigeration piping and system components to promote safety and simplify maintenance. The system is also compatible with ANSI/ASME A13.1, the most widely-used general facility pipe marking standard in the United States.

Building on ANSI/ASME A13.1

Under the ANSI/ASME A13.1 framework, a facility’s pipe labels need to:

  • clearly identify the contents of the pipe,
  • indicate the general functions or hazards of those contents,
  • and show which way those contents are flowing

To accomplish this, standardized pipe labels use

  • bold text to name the pipe’s contents,
  • a color code to show the general category for the pipe,
  • and arrows to point out the direction of flow

The ANSI/ASME standard also provides guidance on how large to make the labels, ensuring that they can be seen and read easily. The sizing recommendations are based on the size of the pipe — specifically, the outer diameter of the pipe, including any insulation or other covering.

Additionally, the general standard makes recommendations for where to place pipe labels, and how often to repeat them, to maximize label visibility. For example, pipe labels should appear on either side of a wall penetration, near any valve, and repeating periodically along straight runs of pipe. Where a pipe will be seen from above or below, placing the label on the upper or lower part of the pipe can be necessary for readability.

IIAR Bulletin No. 114

The IIAR standard builds on this foundation. Typical ammonia pipe labels will use the word “Ammonia” and a printed arrow, to show what’s in the pipe and which way it’s going; the main body of the label will be orange, to match the ANSI/ASME recommended color for labeling pipes of toxic materials.

With ammonia refrigeration, though, there are some additional details that are important. With the size and complexity of industrial refrigeration systems, it’s often necessary to identify specific parts of the system, or the functions of specific pipes or equipment. Additionally, workers may need to know the physical state and pressure level of the ammonia at a given point, in order to perform their work safely. The IIAR standard adds pipe labeling elements to cover these details.

To learn the latest guidelines from the IIAR, elements of a typical ammonia pipe marking label, and solutions to streamline the label process, watch the full webinar on demand now!

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Ammonia Pipe Marking Webinar