The Go or No Go test, using a plug pulled through at 95% of the pipe diameter, is a method of which testing?

• A. Alignment testing
• B. Infiltration testing
• C. Exfiltration testing
• D. Air pressure testing

Answer: (A)

The go/no-go plug test is about checking the interior geometry and alignment of the pipe. By pulling a plug that is about 95% of the pipe diameter through the finished section, you’re testing whether the line follows the intended path smoothly without sharp deflections, misalignments, or obstructed joints. If the plug passes readily, the section is considered properly aligned and the interior is acceptable for the next steps. If the plug binds or stalls, it signals potential misalignment or an obstruction that could cause problems later, so it needs correction before backfilling.

This kind of test is not about water entering or leaving the pipe, so it isn’t infiltration or exfiltration testing. It also isn’t about measuring leaks with air pressure, so it isn’t an air pressure test. The goal here is to ensure the pipe’s alignment and interior condition are suitable, hence it’s an alignment testing method.