What is a common misconception about thermal expansion in plumbing?

The common misconception about thermal expansion in plumbing relates to the idea that movement occurs specifically at the elbows of an expansion loop. In reality, thermal expansion affects the entire length of the pipe, not just the bends or elbows. When water is heated, it expands, and this thermal expansion causes movement along the entire pipe length, leading to the necessity for proper expansion loops or fittings designed to accommodate this movement. If only the elbows were considered, it would lead to potential miscalculations in the design and function of the plumbing system, ultimately resulting in stress on the pipes and possible damage.

Understanding that thermal expansion is a property of all materials, and that pipe lengths, not just the turns, need to be taken into account, helps ensure that plumbing systems are designed appropriately for temperature fluctuations. The inclusion of expansion loops is crucial for relieving stress that can cause leaks or breaks over time.