Sanitation, Plumbing Design and Installation (Part 4) | Master Plumber Licensure Exam Refresher

Shower receptors built directly on the ground must be acid-resistant and have a firm bed. For those built above ground, the subfloor and rough side of walls should extend at least 3 inches or 76 mm above the top of the finished dam. Lining materials for shower compartments must be pitched at a slope of 20 mm per meter to weep holes.

All folds, laps, and reinforcing webbing in shower compartments must extend at least 101 mm in all directions from the corner. Lead and copper sub-pans or linings need to be insulated from other conducting substances. Lead pans should weigh at least 19.6 kg per square meter, while copper pans should be at least 24 B and S5 mm thick. Joints in lead pans must be burned.

Whirlpool bathtubs require a removable panel for access to the pump and their pump and circulating piping must be self-draining to minimize water retention. An ABS stack can be tested one hour after the last joint is made. A drum trap is classified as a large-diameter water seal device. A cleanout is located in an accessible area on a sanitary waste line, attaching to the end of the waste pipe in the opposite direction of flow.

The owner's agent is responsible for maintaining the plumbing and drainage system. An air test should be used when there is reason to believe a drainage or plumbing system has become defective. A gooseneck is a flexible pipe part that curves. Zinc is the principal alloy found in brass, a common copper alloy used in plumbing. Water test procedures should ensure the system is tight at all points, with the primary goal being a fully sealed system.