When discussing pressure relief valves in industrial ammonia refrigeration systems, most conversations focus on the set pressure, relieving capacity, and whether the valve is properly sized for the application. But how often do we discuss what's happening inside the valve? Understanding the huddling chamber, pop action, and the importance of selecting the correct relief valve for hydrostatic protection. Not all pressure relief valves are designed to operate the same way. In f

Ammonia refrigeration operators are familiar with the importance of oil inside a compressor. After all, oil provides lubrication, cooling, and sealing, all of which are critical to compressor performance. But what happens when that same oil escapes the compressor and begins accumulating throughout the refrigeration system? Suddenly, something that was essential for efficiency inside the compressor becomes a contributing factor to inefficiency elsewhere in the system. Even wit

Hot gas defrost is one of those processes in an ammonia refrigeration system that can easily become a “set it and forget it” operation. An evaporator may have been programmed for a 30-minute hot gas defrost years ago, and as long as the coil stays clear, nobody questions it. But just because a defrost cycle works does not necessarily mean it is operating efficiently. The challenge with that mindset is that a defrost cycle can be effective without necessarily being efficient.