Red Seal Steamfitter/Pipefitter Practice Exam

What is the role of an expansion joint in piping?

1. To connect two different pipe systems

2. To absorb thermal expansion and contraction

3. To enhance pipe aesthetics

4. To support heavy pipe loads

The correct answer is: To absorb thermal expansion and contraction

An expansion joint is specifically designed to accommodate the thermal expansion and contraction that occurs in piping systems due to temperature fluctuations. When fluids are heated, they can cause the pipes to expand; conversely, when the temperature drops, the pipes contract. This movement can create stress in the piping system, potentially leading to damage such as cracking, leaks, or misalignment. The use of an expansion joint allows for this movement to take place without adversely affecting the integrity of the piping system. By effectively absorbing the stresses caused by thermal changes, expansion joints help maintain the operational safety and longevity of piping installations. This functionality is essential in various applications, including steam, water, and chemical pipelines, where extreme temperature changes occur.