DWV system testing uses which two methods?

DWV system testing uses which two methods?

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

Answer: (B)

Testing a DWV system is about confirming there are no leaks by applying pressure in a controlled way. The two standard methods used are air pressure testing and hydrostatic water testing. An air test seals the system and introduces pressurized air, then monitors whether the pressure holds over a set time to reveal leaks. A water test fills the system with water to create hydrostatic pressure; you observe for any drop in water level or visible leaks over the test period, which indicates joints or fittings that aren’t watertight. These methods are reliable for checking joints, traps, and connections before the system is put into service. Smoke testing, while useful for locating leaks in some scenarios, is not the primary method for validating DWV integrity during installation, and vacuum testing is less commonly used in standard practice.

Testing a DWV system is about confirming there are no leaks by applying pressure in a controlled way. The two standard methods used are air pressure testing and hydrostatic water testing. An air test seals the system and introduces pressurized air, then monitors whether the pressure holds over a set time to reveal leaks. A water test fills the system with water to create hydrostatic pressure; you observe for any drop in water level or visible leaks over the test period, which indicates joints or fittings that aren’t watertight. These methods are reliable for checking joints, traps, and connections before the system is put into service. Smoke testing, while useful for locating leaks in some scenarios, is not the primary method for validating DWV integrity during installation, and vacuum testing is less commonly used in standard practice.