Recent Blog Posts

Can Ammonia Pipes Be Welded to Their Supports?

January 11th, 2022

We recently published a blog addressing various aspects of ANSI/IIAR 4-2020. On the topic of pipe supports, Standard 4 introduces a prohibition that was not previously included in the 2015 edition. ANSI/IIAR 4-2020 §6.1.2 requires that “Piping support systems shall be installed to retain pipe within the support. Pipe shall not be welded to supports […]

All Good Things Must Come to an End: How to Decommission Ammonia Systems According to ANSI/IIAR 8-2020

January 4th, 2022

Last year IIAR published a new edition to Standard 8 Decommissioning of Closed-Circuit Refrigeration Systems. ANSI/IIAR 8-2020 contains many of the same minimum requirements as the 2015 edition, but as always, there are a few nuances worthy of our attention. First, let’s get the big picture of Standard 8. Overview of Standard 8 Standard 8 […]

7 Takeaways from ANSI/IIAR 7-2019

December 28th, 2021

IIAR’s suite of standards addresses the minimum requirements for ammonia refrigeration systems from design through decommissioning. Standard 7 is unique in tackling the development of operating procedures for these systems. The publication is titled Developing Operating Procedures for Closed-Circuit Ammonia Refrigeration Systems and was most recently updated in 2019. To better understand the function of […]

Eight Things to Know About ANSI/IIAR 4-2020

December 14th, 2021

Last year, IIAR published a new edition of Standard 4 Installation of Closed-Circuit Ammonia Refrigeration Systems. We’ve spent considerable time familiarizing with this document and have distilled key themes into eight things you should know about Standard 4. 1. Install the system in accordance with its design. Remember the equipment layouts, elevation drawings, and piping […]

Differences Between IIAR Standards 2 and 9

September 15th, 2020

Earlier this year, IIAR published ANSI/IIAR 9-2020 Standard for Minimum System Safety Requirements for Existing Closed-Circuit Ammonia Refrigeration Systems. While it has long been recognized that new systems must adhere to the requirements of IIAR Standards 2 and 4, facilities with existing systems have often been confused on how they should relate to these standards. […]