Which tool is commonly used to check for leaks in an ammonia piping system?

In ammonia refrigerant systems, detecting leaks is crucial for safety and efficiency. A sulfur stick or pH paper is specifically designed to indicate the presence of ammonia; when ammonia comes into contact with the sulfur stick, it produces a noticeable change that signals a leak. This method is straightforward and provides immediate visual feedback, making it an effective tool for personnel who are trained to recognize the signs of ammonia leaks.

The effectiveness of using these tools lies in their ability to detect ammonia specifically, as ammonia has distinct chemical properties. Other detection methods, like using an infrared leak detector, are useful for various gases but may not be as practical in identifying leaks specific to ammonia without additional calibration or specificity. Thus, the sulfur stick stands out in this context as a practical and commonly employed tool for identifying ammonia leaks in industrial refrigeration systems.