Recent Blog Posts

Update on Ammonia Diffusion Tanks

September 5th, 2017

Since 1994, jurisdictions which adopted the Uniform Mechanical Code (UMC) have required ammonia refrigeration systems to be equipped with a diffusion tank to which all pressure relief valve discharge pipes must terminate. As a state, California has adhered to the California Mechanical Code (CMC) which is a derivative of the UMC. The most recent version […]

Relief Valve Piping System Design Scenario

January 24th, 2017

One often overlooked aspect of a relief valve discharge termination piping system is the scenario that was used at the basis of the piping design. Most designers understand that termination piping must be sized so as to not cause excessive back pressure in the manifold when a relief valve lifts. The question, however, that must […]

Machinery Room Ventilation Requirements

August 9th, 2016

In this week’s blog post we will summarize the machinery room ventilation requirements contained within ANSI/IIAR 2-2014. We have broken down the ventilation requirements into three (3) categories: Design and Installation Control Testing Some of the requirements overlap and are listed in more than one of the categories. Design and Installation When occupied, the machinery […]

Ammonia Detection Requirements

May 17th, 2016

The recent release of ANSI/IIAR 2-2014 has provided the ammonia refrigeration industry with much needed direction on the topic of ammonia detection in a refrigerated facility. Prior to the release of this document, IIAR 2 only addressed ammonia detection within the context of a machinery room and left the requirements of “other than machinery rooms” […]

Access to Refrigeration Systems

May 3rd, 2016

It has long been required that access be considered when designing and installing an ammonia refrigeration system. In fact, we wrote about this topic in some detail back in 2013. However, with the recent release of ANSI/IIAR 2-2014, it is appropriate to revisit all of the relevant access requirements contained within this important RAGAGEP document. […]