The International Institute of Ammonia Refrigeration (IIAR) released updates to its IIAR-2 standard for safe design of ammonia refrigeration systems last month in the December 2015 issue of its Condenser magazine.
For the first time, the standard, established in 1974, addresses ammonia equipment outside of the machine room in industrial settings, including a section on low-charge ammonia packaged systems.
IIAR-2 has traditionally been written as a standard for safety and design but the new iteration also serves as a code (what to do) as well as a standard (how to do it).
Some of the other major changes to the standard include:
Standards for outdoor installation.
Clarification of relief piping terminations
A chapter on ammonia detection and alarms.
Definitions of combustible material, trained operators and public access.
Clarifications on seismic bracing and on text for signage, labels and pipe marking.
An increase of the minimum pressure for low-side vessels to 250 PSIG from 150 PSIG.
A decrease in detection level trigger for emergency ventilation system to 150 ppm from 1,000 ppm.
On 20 March 2016, IIAR will host an education programme on the newly revised IIAR-2 at the IIAR Industrial Refrigeration Conference & Exhibition in Orlando, Florida.