International Institute for Ammonia Refrigeration (IIAR)
Ammonia Refrigeration Pipe Marking Guide
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1. Use arrows at both ends of the label to indicate the direction of flow in the pipe.

2. Use the following abbreviations to identify system components.

3. Indicate whether the refrigerant is a liquid, vapor, or both.

4. Print "Ammonia" in black letters on a yellow background.

5. Indicate whether the internal pipe pressure is high or low.

This ammonia pipe marking guide is intended for general information purposes only. This guide is not a substitute for review of applicable government regulations and standards.

Information about DuraLabel ammonia pipe marker printers.
Ammonia Pipe Marking - overview