Sigma™ ONE-LOK™ Wedge Restraint, Series: SLCEP, 8 in Pipe, 100 to 305 psi, 4 Bolts, 7/8 in Bolt, Ductile Iron, Red Alkyd Painted, For Use With: PVC Pipe
Restraint for standard mechanical joint fittings shall be incorporated in the design of the follower gland and shall utilize multiple wedge segments that act against the pipe, increasing their resistance as the line pressure increases. The assembled joint shall maintain the maximum flexibility and deflection of all nominal pipe sizes after burial. Restraining gland, wedge segments and actuating bolts shall be manufactured of high strength ductile iron conforming to the requirements of ASTM A536, Grade 65 45-12. Dimensions shall be compatible with standardized mechanical joints conforming to the requirements AWWA C111/ANSI A21.11 and AWWA C153/ANSI 21.53 through 24 in (latest revision). Breakaway tops shall be incorporated in the design of the actuating bolts to visually ensure proper torque. The manufacturing of the actuating bolt must incorporate a quality control procedure that is deemed acceptable by the specifier and positively assures precise and consistent operating torque of the breakaway top. The mechanical joint restraining devices shall have a working pressure rating of 235 psi and provide no less than a safety factor of 2:1. Restraint shall be FM approved in applicable sizes. Restraining device shall be Sigma™ ONE-LOK™ or approved equal.