Internal pressure in a pipeline generates a thrust force which can cause pipe separation unless pipe joints are restrained. the magnitude of the thrust is proportional to the line pressure and the pipe area based on the pipe O.D.

The thrust is a major consideration in the design of any piping system. In underground piping systems, the thrust force is countered by the bearing strength of the soil and friction at the pipe-to-soil interface. the effectiveness of the soil in resisting thrust will vary depending on the type and condition of the soil and trench.

Properly installed joint restraints insure pipeline integrity and provide a considerable savings when compared to concrete thrust blocks.

The 980 Series joint restraining system offers a quick method of anchoring PVC, Ductile Iron, and Carbon Steel pipe joints.

The restraint devices are available in two designs. The 981 is designed for restraining pipe to mechanical joints. the 932 is designed to restrain a bell and spigot joint. They are engineered to provide high resistance to thrust force, eliminating the need for other methods of restraint. (Support blocks may still be needed beneath heavy fittings.)

The unique "elongated spiked" design provides the "grip" required to secure the restrainer with minimal disturbance to the pipe surface. This design offers virtually 360 degrees contact while retaining the pipe profile.

Installation is made easier by having a slot in each clamp half for the clamp nut to rest in. This eliminates the need for two wrenches during installation.

The ductile iron size restrainer(blue) can be used to restrain ductile iron pipe or cast iron O.D. PVC pipe. The steel size (IPS) restrainer (red) can be used to restrain steel pipe and steel pipe size (IPS) pipe.