What type of pipe joint is utilized in seismic areas to prevent separation?

In seismic areas, a restrained joint is the most effective solution for preventing separation of pipe sections during seismic events. These joints are specifically designed to hold the pipes together firmly, providing stability and reducing the risk of dislocation when subjected to ground movements caused by earthquakes.

Restrained joints use various mechanisms, such as bolts, flanges, or other connection methods that physically lock the pipes in place, preventing them from sliding apart. This is crucial in seismic zones where the ground can shift dramatically, potentially leading to significant damage if the pipes separate.

While other joint types, like flexible joints, allow for some movement, they do not provide the same level of security against separation. Flexible joints may accommodate slight displacements but are less suited for the high forces that occur during an earthquake. Expansion joints allow for thermal expansion but do not offer restraint against lateral movement. Welded joints create a continuous connection but lack the flexibility needed to absorb seismic forces, which can lead to cracking or failure if the ground shifts suddenly.