Red Seal Gasfitter — Class A Practice Exam

What is a common tool used to identify gas leaks in a piping system?

1. Manifold gauge

2. Soap solution

3. Infrared thermometer

4. Pressure gauge

The correct answer is: Soap solution

A common tool used to identify gas leaks in a piping system is a soap solution. This method involves applying a mixture of soap and water to the areas where a gas leak is suspected. If there is a leak, the escaping gas will create bubbles in the soapy solution, making it easy to detect even small leaks. This technique is widely used because it is simple, effective, and does not require specialized equipment. While manifold gauges, infrared thermometers, and pressure gauges are important tools in gas fitting, they serve different purposes. Manifold gauges are primarily used for measuring the pressure of refrigerant systems rather than detecting gas leaks. Infrared thermometers can measure temperature changes but do not directly indicate the presence of gas. Pressure gauges can measure gas pressure but would not visually indicate a leak without additional methods like the soap solution test.