What is the primary function of restrained joints in water distribution systems?

The primary function of restrained joints in water distribution systems is to prevent movement. These joints are designed to provide stability and maintain alignment within the pipeline system. In scenarios where significant forces such as thrust or pressure changes occur—often at bends, tees, or valves—restrained joints are essential to ensure that the piping remains securely in position and does not shift or separate.

By preventing movement, restrained joints help to minimize the risk of leaks and failures, which can lead to costly repairs and disruptions in service. Instead of allowing for flexibility or quick installation, the primary focus is on securing the system against the various forces it might encounter during operation. This functionality is vital for the longevity and reliability of water distribution systems.