What is the purpose of a thrust block in pipeline installation?

The purpose of a thrust block in pipeline installation is to prevent movement of pipes during water flow. When water flows through a pipeline, it generates pressure that can create thrust forces at bends, joints, and fittings. If not properly managed, these forces can lead to misalignment or disconnection of the pipes, resulting in leaks or pipe failure. Thrust blocks are typically constructed from concrete and are placed against fittings or bends to absorb these thrust forces and stabilize the pipeline, ensuring that it remains securely in place under the pressure of the flowing water.

Supporting the weight of the pipes is not the primary function of a thrust block, as the structural integrity and support of the pipeline are generally provided by the soil or other structural materials used in the installation. Connecting different diameter pipes involves using fittings designed specifically for that purpose, while allowing for expansion of pipes typically involves the use of expansion joints or similar devices to accommodate thermal expansion and contraction.