What is the published upper explosive limit for ammonia?

The upper explosive limit (UEL) for ammonia is significant in understanding its flammability and potential hazards in refrigeration systems. The UEL refers to the maximum concentration of ammonia in air that can ignite. When the concentration exceeds this limit, the mixture becomes too rich to burn, which means that there is not enough oxygen available to support combustion.

The published upper explosive limit for ammonia is indeed around 25%. At this concentration, ammonia can form an explosive atmosphere if an ignition source is present, which is critical information for safely handling and working with ammonia in refrigeration applications.

Understanding this limit helps operators in ensuring that systems are maintained and monitored to stay within safe operational parameters to prevent explosions and related hazards. Working with ammonia necessitates strict adherence to safety guidelines, including understanding its explosive limits, to protect personnel and equipment.