The principle behind this test is that if the air pressure is greater inside the pipe than atmospheric pressure, air will leak out of cracks in the pipe. Pipe pressure must be 3 to 5 psi above atmospheric pressure. Measure the time it takes for the pressure to drop (helps determine the size of the leak)

The principle behind this test is that if the air pressure is greater inside the pipe than atmospheric pressure, air will leak out of cracks in the pipe. Pipe pressure must be 3 to 5 psi above atmospheric pressure. Measure the time it takes for the pressure to drop (helps determine the size of the leak)

• A. Smoke Test
• B. Air Test
• C. Water Test
• D. Vacuum Test

Answer: (B)

Air testing a pipe works by sealing the line and charging it with air so the pressure inside sits a few pounds per square inch above the surrounding atmosphere. Because air can escape through any cracks or joints, the internal pressure will drop if there’s a leak. Keeping the pressure in the 3 to 5 psi range above atmosphere provides a detectable yet safe level to work with. By timing how long it takes for the pressure to fall, you can gauge the leak’s size: a quicker drop means a bigger leak, a slower drop means a smaller one. This approach focuses on observing pressure decay to identify leaks, which is distinct from tests that rely on smoke visualization, filling the line with water, or creating a vacuum.

Air testing a pipe works by sealing the line and charging it with air so the pressure inside sits a few pounds per square inch above the surrounding atmosphere. Because air can escape through any cracks or joints, the internal pressure will drop if there’s a leak. Keeping the pressure in the 3 to 5 psi range above atmosphere provides a detectable yet safe level to work with. By timing how long it takes for the pressure to fall, you can gauge the leak’s size: a quicker drop means a bigger leak, a slower drop means a smaller one. This approach focuses on observing pressure decay to identify leaks, which is distinct from tests that rely on smoke visualization, filling the line with water, or creating a vacuum.