test shall be applied to the drainage system
either in its entirety or in sections. If applied to the entire system, all openings in the piping shall be tightly closed, except the highest opening, and the system shall be filled with water
to the point of overflow. If the system is tested in sections, each opening shall be tightly plugged except the highest openings of the section under test, and each section shall be filled with water
, but no section shall be tested with less than a 10-foot (3048 mm) head of water
. In testing successive sections, at least the upper 10 feet (3048 mm) of the next preceding section shall be tested so that no joint
or pipe in the building, except the uppermost 10 feet (3048 mm) of the system, shall have been submitted to a test of less than a 10-foot (3048 mm) head of water
. This pressure
shall be held for at least 15 minutes. The system shall then be tight at all points.