Recent Blog Posts

Ammonia Refrigeration and the 2018 International Fire Code

June 26th, 2018

The International Code Council (ICC) recently released their publication of the 2018 International Fire Code (IFC) and it contains three noteworthy changes/clarifications that will impact ammonia refrigeration systems built under the jurisdiction of this code. There has been some shifting around from the 2015 IFC, so we hope to familiarize you with the following changes: […]

Comparing RAGAGEPs: Relief Valve Sizing

May 15th, 2018

It’s widely known that pressure vessels must be equipped with over-pressure protection (2015 ASME B&PVC UG-125), often in the form of a pressure relief valve. Properly sizing a relief valve requires engineering analysis which accounts for the type of over-pressure scenarios that might occur. In most cases, model codes and standards (RAGAGEPs) specify the relief […]

Oil Storage and Machinery Rooms

October 3rd, 2017

Every closed-circuit ammonia refrigeration system utilizes oil for compressor lubrication. Facilities typically maintain new oil onsite in 55-gallon drums. We have observed that it is common practice for many facilities to store reserve oil inside the machinery room. ANSI/IIAR 2-2014 §6.4 addresses the storage of combustible materials inside the machinery room. This section requires that: […]

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 […]

PSI Explained: Design Codes and Standards Employed

July 11th, 2017

In addition to the technical documentation that we have discussed previously (P&IDs, Ventilation System Design, Relief System Design and Design Basis, etc.), Title 8 CCR §5189(d)(3)(A)(6) and Title 29 CFR §1910.119(d)(3)(i)(F) require that a facility have documentation describing the “Design Codes and Standards Employed” readily available for each PSM chemical process. This documentation serves multiple purposes: […]