Recent Blog Posts

Checklists: B109 vs. Appendix B (IIAR 6, Part 16)

March 31st, 2020

IIAR Bulletin No. 109 (B109) has been an integral part of ammonia refrigeration vernacular for over 20 years. “B109s” have been the gold standard for annual mechanical integrity inspections since the document was published in 1997. The ten easy to understand checklists which comprise most of the document have served our industry well during this […]

Relief Valve Replacement vs. Bench Testing (IIAR 6, Part 15)

March 17th, 2020

Replacement of pressure relief valves (PRVs) every five (5) years has long been established as RAGAGEP in industry documents (IIAR Bulletin No. 109 and No. 110) and manufacturer literature. ANSI/IIAR 6-2019 ยง13.1.2 introduces an alternative for owners that desire to increase the service life of their PRVs. The alternate test method can extend the service […]

Eyewash and Safety Shower ITM (IIAR 6, Part 14)

March 3rd, 2020

ANSI/IIAR 6-2019 Table 12.5 summarizes the minimum ITM requirements for eyewash and safety showers. We’ve written about tests of eyewash and safety showers in the past, and thankfully IIAR 6 does not introduce any new ITM tasks, but instead repeats the requirements which were previously published in ANSI/ISEA Z358.1-2014. In lieu of copying Table 12.5 […]

Pipe Corrosion (IIAR 6, Part 13)

February 18th, 2020

In Part 12 of our series on ANSI/IIAR 6-2019 we examined the ITM requirements related to pressure vessel corrosion. While many of the same principles apply, it is fitting to explore unique considerations when inspecting ammonia pipe. Table 11.1 requires non-insulated ammonia pipes to be inspected annually for pitting and surface damage (Inspection Item A). […]

Vessel Corrosion (IIAR 6, Part 12)

February 4th, 2020

Pipe and vessel corrosion has been a regular cause of ammonia releases since the invention of the vapor compression refrigeration cycle. For this reason, it is appropriate that ANSI/IIAR 6-2019 prescribe the minimum requirements for inspection, testing, and maintenance of pressure vessels. ANSI/IIAR 6-2019 Table 10.1 requires that non-insulated pressure vessels be inspected annually for […]