Importance of Testing and Inspection:
Plumbing and drainage systems must be inspected and tested before being covered, concealed, or put into service.
Underground Inspection:
Conducted after excavation and installation of piping, but before backfilling.
Easier to test and repair leaks before covering the pipes.
Rough-In Inspection:
Performed on completed portions of sanitary, storm, and water distribution piping after framing, fire blocking, and bracing are in place, but before wall or ceiling installation.
Final Inspection:
Conducted after the building is complete, with all plumbing fixtures in place and properly connected.
This inspection ensures the building is ready for occupancy.
Sewer System Testing:
Insert a test plug at the connection to the public sewer.
Fill the system with water, maintaining at least 10 feet of head pressure for 15 minutes.
Drain Waste and Vent (DWV) System Testing:
Water Test: Fill each section with water to the highest point, hold for 15 minutes, and inspect for leaks.
Air Test: Pressurize the system to 5 PSI or 10 inches of mercury, holding for 15 minutes without leaks.
Fixture Traps Testing:
After installation, fill the traps with water, then test for both water and gas tightness.
Water Tightness: Fill and drain each fixture to visually inspect for leaks.
Gas Tightness: Use either a theatrical smoke generator or peppermint oil to detect gas leaks.
Water Supply System Testing:
Upon completion, test under water pressure at least equal to the system’s working pressure or an air pressure test of no less than 50 PSI for 15 minutes.
Use proper test gauges with the following increments:
0.1 PSI for pressures under 10 PSI.
1 PSI for pressures between 10-100 PSI.
2 PSI for pressures over 100 PSI.
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