UL 1713-2017 pdf download – Pressure Pipe and Couplings, Glass Fiber- Reinforced, for Underground Fire Service.
11 Leakage Test for Joints 11.1 Pipe joints having maximum clearances and joints having minimum clearances between the pipe spigot and pipe bell or coupling, with clearances determined by the manufacturer’s tolerances, shall not leak and shall not exhibit damage that impairs the intended operation when subjected to a hydrostatic pressure of twice the rated pressure. 11.2 Pipe to be used in each test is to be representative of each class and size. At least one joint is to be machined to the maximum clearance allowed by the manufacturer’s tolerances. A test line is to be assembled of at least five lengths of pipe with couplings and sealing gaskets, in compliance with the manufacturer’s installation instructions. At least two joints, including the maximum clearance joint, are to be deflected to the maximum deflection rated by the manufacturer. The ends of the test line are to be restrained to confine longitudinal separation at the joints. Four tests of single joints are capable of being conducted in lieu of the test on a single line. 11.3 The test line is to be connected to the hydrostatic pressure testing equipment and all air is to be expelled from the system. The water pressure is to be increased in 50 psig (345 kPa) increments until twice the rated pressure is attained. At each increment of pressure increase, measurements are to be made of distortion at each joint, protrusion of gasket material (if any) or other factors that cause leakage after continued use of the pipe in service. During the test, the pressure is not to be increased to the next increment until the line and connections have become stable, as evidenced by no further movement of gasket material. 11.4 After the test pressure has been increased to twice the rated pressure, the test pressure is to be decreased to 0 psig, while observations are made for leakage. Then, the pressure is again to be slowly increased to twice the rated pressure while observations are made for leakage.