What is one method used to test for leaks in an ammonia refrigeration system?

One method commonly utilized to test for leaks in an ammonia refrigeration system involves the use of sulfur candles and soap bubbles. This method is effective because ammonia is highly soluble in water, and any leaks can be detected by the formation of bubbles when soap solutions are applied to the suspected areas. When a leak occurs, the escaping ammonia gas will cause the soap solution to bubble up, clearly indicating the presence of the leak. This approach is relatively simple, cost-effective, and provides immediate visual confirmation of a problem.

The use of sulfur candles is relevant in older practices where burning sulfur produces a distinct odor that can indicate ammonia presence, further assisting in leakage detection in the context of the ammonia refrigeration systems. This combination of techniques makes it a reliable method for identifying leaks.

In contrast, the other methods listed have limitations. For example, ultraviolet light is primarily used to detect certain types of refrigerant leaks, typically in systems using fluorescent dyes, which do not apply to ammonia. Although a pressure gauge is useful for monitoring system pressure, it does not provide direct evidence of leaks. Thermal imaging cameras can detect temperature differences but are less effective in pinpointing gas leaks specifically in refrigeration contexts compared to the bubble method with soap solutions.