What test is used to determine if there are leaks in valves or lines?

• A. Pressure test
• B. Leak test
• C. Dye penetrant test
• D. Hydrostatic test

Answer: (A)

Pressurizing the system and watching for pressure loss or visible seepage directly tests whether valves or lines can hold the intended pressure, which is how leaks are detected. This approach, called a pressure test, is the standard way to confirm tightness because it actively checks the system under the conditions it will face in operation. A leak test is a vague term that doesn’t specify how the check is done. A dye penetrant test looks for surface cracks in materials, not for leaks through joints or walls. A hydrostatic test is a specific type of pressure test that uses water as the test medium; while it can reveal leaks, the general method used to determine leaks in valves or lines is pressure testing.