Which method is typically used to check for leaks in an ammonia piping system?

The use of a sulfur stick or pH paper is a widely accepted method for detecting leaks in an ammonia piping system. Ammonia has a distinct chemical reaction when it comes into contact with sulfur sticks, which change color in the presence of ammonia. Similarly, pH paper can indicate the presence of ammonia based on its alkaline properties. This method is especially effective because it offers a straightforward and immediate visual indication of ammonia leaks, which is essential for maintenance and safety in systems using this refrigerant.

While other methods such as ultrasonic testing, visual inspection, and thermal imaging can be useful in detecting leaks, they do not specifically target the chemical properties of ammonia or provide as direct a method for confirming ammonia's presence as sulfur sticks and pH paper do. Using a sulfur stick or pH paper ensures that even small leaks can be detected reliably, making it a practical choice for this application.