The piping of drainage and vent systems shall be tested with water or air in accordance with Sections P-1506.2 or P-1506.3 when inspection is required by Section P-1501. Water tests shall not be used in freezing weather. Cleanouts or plugs shall be removed and traps unsealed, if requested by the Department, to ascertain whether the test medium has reached all parts of the system. After the plumbing fixtures have been set and their traps filled with water, the entire drainage system shall be submitted to final inspection.
A water test shall be applied to the drainage and vent system in its entirety or in sections. If tested in sections, not more than 30 feet in height on any one system shall be tested at any one time. If applied to the entire system, all openings in the piping shall be tightly closed - except the highest - opening and the system filled with water to the point of overflow. If the system is tested in sections, each opening shall be tightly plugged (except the highest opening of the water) but no section (except the house drain and its connected yard and area drains) shall be tested with less than a 10-foot head of water. In testing successive sections above the house drain, at least the upper 10 feet of the next preceding section shall be re-tested so that no joint or pipe in the building (except the house drain and the uppermost 10 feet of the system) shall have been submitted to a test of less than a 10-foot head of water. The water shall be kept in the system or in the portion under test for at least 15 minutes before inspection starts; the system shall then be tight at all points.
The house drain and yard area drains, including all piping to a height of 2 feet above the highest point of the house drain, shall be tested separately. All traps, pipe fittings and joints shall be exposed to view when the test is made. Water shall be introduced into the system in the quantity deemed necessary by the Department. To be approved, the flow of water through the system shall be unobstructed, and there shall be no leakage through any pipe, joint, trap, or fitting.
The air test shall be made by attaching an air compressor or testing apparatus to any suitable opening and, after closing all other inlets to the system, by forcing air into the system until there is a uniform gauge pressure of 5 psi. This pressure shall be held without the introduction of additional air for a period of at least 15 minutes. Wooden plugs shall not be used to close openings.