What is the fuel range for pure ammonia in terms of its concentration?

The fuel range for pure ammonia, specifically in terms of its concentration, is correctly identified as 15% to 28%. Within this range, ammonia can form a flammable mixture with air under certain conditions. Understanding the combustible limits of ammonia is crucial for safety in industrial applications, particularly in refrigeration systems. The concentration below 15% does not support combustion, while concentrations above 28% become too rich to ignite, meaning they won't sustain a flame.

In industrial settings, adhering to these concentration limits is important for preventing potential fire hazards, as ammonia is an efficient refrigerant but also poses risks if it is allowed to reach its flammable limits.