What is the IIAR?

The IIAR is an acronym for the International Institute of Ammonia Refrigeration. The institute oversees the standards on labeling industrial refrigeration equipment for all those who interact with the refrigeration system and its necessary components. The IIAR does this through education and advocacy as they are striving to be the main provider on performance standards of industrial refrigeration systems all over the world. In fact, they host a yearly conference where more than 1,000 ammonia refrigeration specialists convene to talk about regulatory compliance, operational and design issues, codes, and standards.

The people that the IIAR’s information is pertinent to are:

  • End users
  • Contractors
  • Engineers
  • Component manufacturers
  • Suppliers
  • Academics

The IIAR is the only entity that is currently establishing performance standards for these industrial ammonia refrigeration systems. There are several standards that they have created for the industry, one of these is the ANSI/IIAR 2-1999 for the equipment, design, and installation of closed-circuit ammonia mechanical refrigerating systems. Another is ANSI/IIAR 3-2005 which involves specifications on ammonia refrigeration valves. Aside from those two examples, there are too many standards to list here. It is good to note that the IIAR is continuously working and collaborating to create standards that involve the business side of things like start-up and commissioning as well as the manufacturing side where installation, decommissioning, development, and operating procedures are concerned. Overall, the IIAR is creating these standards in the best interest of employees who must work with these potentially hazardous refrigeration systems.

What are the IIAR’s pipe marking standards?

The IIAR bulletin No. 114 is a document that contains the specific guidelines on labeling ammonia pipes for refrigeration purposes. There are five required pipe marking components for labeling ammonia, these are:

  • An orange background with “Ammonia” in black letters
  • Its physical state (liquid or vapor) must be labeled on the left-side in sky blue or yellow respectively with black letters
  • The pressure level should be labeled on the right-side red for high or green for low, also in black lettering
  • Any abbreviations are to be on the left side before the colored band and in black letters
  • Directional arrows may be printed on the body of the label proportional to the size, they can also be wrapped all the way around the pipe.

Neatly aligned with the ANSI/ASME pipe marking standards for general pipe marking, the IIAR ammonia labeling standard is extremely important when regarding this hazardous material since there is a high risk of accidental exposure to high concentrations of pure ammonia. Labeling is essentially an extra safety net to ensure that the employees stay safe in the workplace.


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