During an air pressure test, what psi should the pressure never exceed?

During an air pressure test, what psi should the pressure never exceed?

• A. 4 psi
• B. 6 psi
• C. 8 psi
• D. 10 psi

Answer: (B)

The test is about checking airtightness of the sewer line using a low-pressure air test. You seal the line, pressurize with air, and watch how the pressure holds over a set period. The goal is to use enough pressure to reveal leaks, but not so much that joints or seals could be damaged. Six psi is chosen as the limit because it provides a reliable indication of leaks while staying well below the level that could overstress typical sewer joints and fittings. Pressures much lower than this can make leaks hard to detect, while higher pressures increase the risk of damage or safety issues. If the line holds pressure at or below six psi with only an allowable, minimal drop, the test passes.