Split Wedge Action Restraint for Ductile Iron Pipe – New or Existing Installations
Manufacturing Quality Iron Products for the Water and Wastewater Industries, Since 1981
Split Wedge Action Restraint for Ductile Iron Pipe – New or Existing Installations
File Type
Restraint for DI push on bells shall incorporate the use of a split restraint and split follower into its design. Split restrainer mechanism shall be integrated into the design of the gland. As the mechanism is activated, multiple wedging action shall be imparted against the pipe increasing its resistance as internal pressure increases. After burial of the restraining mechanism, joint flexibility shall be maintained.
The actuating bolt shall be threaded into the restraining wedge and have a 1-1/4″ hex operating head. The restraining twist off head bolt system shall have a torque-limiting feature designed to break off at preset torque levels, thus insuring proper action of restraining device. Split follower shall be manufactured of high strength ductile iron in accordance with ASTM A536 Grade 65-45-12 requirements. The wedge shall be manufactured of high strength ductile iron and be heat treated to a minimum hardness of 370 BHN.
The split mechanical joint restraint shall have a maximum water working pressure of 350 PSI for sizes 3″ – 8″, 300 PSI for sizes 10″ – 16″, 200 PSI for sizes 18″ – 36″ & 175 PSI for sizes 42″ – 48″. All sizes shall have a minimum safety factor of 2:1 (i.e. twice the maximum pressure rating of the restraint). The restraint mechanism shall be Star® Pipe Products, Split Stargrip® series 3100S or an approved equal.
*Please refer to the catalog for further details and specifications.