What is an 'expansion joint' used for in piping?

An expansion joint is an essential component in piping systems, specifically designed to accommodate the thermal expansion and contraction of pipes. As temperatures change, materials such as metal or plastic can expand when heated and contract when cooled. If the system does not allow for this movement, it can lead to excessive stress on the piping, potentially causing damage such as cracking, leaks, or even failure of the system.

The primary purpose of an expansion joint is to provide a flexible connection in the piping that can absorb these changes in length. Instead of being rigid and fixed, the expansion joint allows for movement, thereby protecting the integrity of the piping system. This flexibility is crucial for maintaining the functionality and longevity of the overall system, especially in environments where temperature fluctuations are common.

While other options might touch upon relevant concerns in piping systems, they do not capture the specific function of an expansion joint as effectively as recognizing its role in managing thermal movements.