When the building inspector comes to review your new plumbing, he or she may require that you perform a pressure test on the DWV and water supply lines as he or she watches. The inspection and test should be performed after the system is com pleted but before the new pipes are covered with wallboard. To ensure that the inspection goes smoothly, it is a good idea to perform your own pretest, so you can locate and repair any problems before the inspector visits.
The DWV system is tested by blocking off the new drain and vent pipes, then pressuring the system with air to see if it leaks. At the fixture stub-outs, the DWV pipes can be capped off or plugged with test balloons designed for this purpose. The air pump, pressure gauge, and test balloons required to test the DWV system can be obtained at tool rental centers.
Testing the water supply lines is a simple matter of turning on the water and examining the joints for leaks. If you find a leak, you will have to drain the pipes, then remake the faulty joints.
The DWV system is tested by blocking off the new drain and vent pipes, then pressuring the system with air to see if it leaks. At the fixture stub-outs, the DWV pipes can be capped off or plugged with test balloons designed for this purpose. The air pump, pressure gauge, and test balloons required to test the DWV system can be obtained at tool rental centers.
Testing the water supply lines is a simple matter of turning on the water and examining the joints for leaks. If you find a leak, you will have to drain the pipes, then remake the faulty joints.
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| A pressure gauge and air pump are used to test DWV lines. The system is first blocked off at each fixture and at points near where the new drain and vent pipes connect to the main stack. Air is then pumped into the system to a pressure of 5 pounds per square inch (psi). To pass inspection, the system must hold this pressure for 15 minutes. |
How to Test new DWV Pipes ?
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