Not a testing method for the house sewer?

Not a testing method for the house sewer?

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

Answer: (B)

Testing a house sewer relies on methods that reveal leaks by pressurizing or filling the piping with fluid or air, not by pulling a vacuum. The water (hydrostatic) test fills the sewer line with water to a set level or pressure and checks for loss, which shows leaks at joints or fittings. The air test introduces a controlled amount of air and measures how quickly the pressure remains stable; a slow or no drop indicates the system is tight. The smoke test pushes non-toxic smoke into the sewer to make any leaks or improper connections visible as smoke escaping from joints, penetrations, or around fixtures. A vacuum test isn’t used because applying suction can cause problematic effects: it can pull water out of traps and dry them, potentially letting sewer gases escape, and it can place unusual stresses on pipes and joints. Those risks and the lack of reliability make vacuum testing inappropriate for typical house sewer installations.

Testing a house sewer relies on methods that reveal leaks by pressurizing or filling the piping with fluid or air, not by pulling a vacuum. The water (hydrostatic) test fills the sewer line with water to a set level or pressure and checks for loss, which shows leaks at joints or fittings. The air test introduces a controlled amount of air and measures how quickly the pressure remains stable; a slow or no drop indicates the system is tight. The smoke test pushes non-toxic smoke into the sewer to make any leaks or improper connections visible as smoke escaping from joints, penetrations, or around fixtures. A vacuum test isn’t used because applying suction can cause problematic effects: it can pull water out of traps and dry them, potentially letting sewer gases escape, and it can place unusual stresses on pipes and joints. Those risks and the lack of reliability make vacuum testing inappropriate for typical house sewer installations.