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IIAR Ammonia Pipe Marking Guidelines

The International Institute of Ammonia Refrigeration (IIAR) has published its bulletin #114, "Guidelines for Identification of Ammonia Refrigeration Piping and System Components," in order to provide a standard system for ammonia pipe labeling. Ammonia pipe markers should contain the elements shown in the figure at right.

Abbreviation System Component BD Booster Discharge CD Condenser DS Defrost Condenser ES Economizer Suction HGD Hot Gas Defrost HPL High Pressure Liquid HSD High Stage Discharge HSS High Stage Suction HTRL High Temperature Recirculated Liquid HTRS High Temperature Recirculated Suction LIC Liquid Injection Cooling LSS Low Stage Suction LTRL Low Temperature Recirculated Liquid RV Relief Vent TSR Thermosyphon Return TSS Thermosyphon Supply

1. Use arrows at both ends to indicate the direction of ammonia flow in the pipe.


2. Use the abbreviations shown in the table to identify system components.


3. Indicate whether the refrigerant is a liquid, vapor or both:
   LIQ—Use black or white text on an orange color band for liquid ammonia.
   VAP—Use black or white text on a blue color band for ammonia vapor.
   LIQ/VAP—Use both color bands if both states may be present.


4. Print AMMONIA in black letters on a yellow background.


5. Indicate whether the internal pipe pressure is high or low:
   HIGH pressure: Use black or white text on a red color band.
   LOW pressure: Use black or white text on a green color band.

Label size, text height, and label placement for ammonia pipe markers should conform to ANSI / ASME A13.1 guidelines.

Important Note: This guide is intended for general information purposes only. This guide is not a substitute for review of applicable government regulations and standards.

Need help with ammonia pipe marking? We offer a free guide to the IIAR ammonia pipe marking standards. Give us a call or send an email using the button below. Our customer service staff will be glad to answer your questions and help you get the tools you need for IIAR and ANSI compliance.

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