Restrained Joint Ductile Iron Pipe

Restrained Joint Ductile Iron Pipe

Restrained Joint structure (also called self-anchored joint), adopts the T-joint sealing structure. Compared with T-joint, it adds a welded bead on spigot, an open-end locking ring, a special gland and connecting bolts to provide the joint with good anti-slippage performance. The locking ring and the gland can slide between each other, so that the joint has certain axial stretching and deflection capability.

Application Field:

In the following conditions, certain length of pipeline with retrained joints could be applied in order to prevent pipeline slippage:

1. Places such as bends, tees, reducers and plugs, etc;

2. When the pipeline laying slope exceeds 20% (laying overground) or 25% (laying underground);

3. When it is uneconomical (such as large-diameter high-pressure pipelines, etc.) or unable to set concrete buttress, for example: A. The construction site is too narrow; there is no space to set up specified concrete block; B. Construction schedule is tight;