During an air test on a new wastewater construction, which tool is used to check the pipe by pulling it through?

During an air test on a new wastewater construction, which tool is used to check the pipe by pulling it through?

• A. Caliper
• B. Mandrel that you pull through
• C. Borescope
• D. Pressure gauge

Answer: (B)

In air testing, you need a way to verify the inside of the pipe is clear and smooth before you seal and pressurize the line. A mandrel that you pull through the pipe is used for this. It is designed to be drawn along the interior, so it will catch or reveal obstructions, debris, or deformations that could affect the test or cause leaks. If the mandrel passes through easily, you know the interior is ready for the air test and the result will be reliable. A caliper measures inside diameter but isn’t pulled through to check the pipe’s interior condition. A borescope can visually inspect the interior, but it isn’t the standard pull-through check used to assess the whole length before an air test. A pressure gauge monitors the test pressure itself but doesn’t verify the interior condition of the pipe.

In air testing, you need a way to verify the inside of the pipe is clear and smooth before you seal and pressurize the line. A mandrel that you pull through the pipe is used for this. It is designed to be drawn along the interior, so it will catch or reveal obstructions, debris, or deformations that could affect the test or cause leaks. If the mandrel passes through easily, you know the interior is ready for the air test and the result will be reliable.

A caliper measures inside diameter but isn’t pulled through to check the pipe’s interior condition. A borescope can visually inspect the interior, but it isn’t the standard pull-through check used to assess the whole length before an air test. A pressure gauge monitors the test pressure itself but doesn’t verify the interior condition of the pipe.