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How do you calculate the expansion length of plastic pipes? What precautions should be taken during construction?

2019-02-28

△L = △T × L × α Where: - △L: Expansion/contraction length (mm) - △T: Calculated temperature difference (°C) - L: Pipe length (m) - α: Linear expansion coefficient (mm/m·°C), typically taken as 0.07 For example, in the Xinjiang desert, if the temperature rises to 45°C during the day and drops to 30°C at night, with a pipe length of 6 meters, the calculation would be: △L = (45 - 30) × 6 × 0.07 = 6.3 mm At first glance, a 6.3-mm contraction in a 6-meter pipe might seem insignificant for R-R connected pipelines. However, when you consider that even a small discrepancy can add up—30 pipes, each shortened by 6.3 mm, result in a total shortfall of 189 mm! In practice, these tiny contractions rarely distribute evenly across every joint; instead, they may concentrate into one or a few specific areas, causing sudden gaps at certain connections. This could lead to sections of pipe unexpectedly pulling apart within an already assembled system—a problem that absolutely cannot be overlooked. To address this issue in the Xinjiang desert, where temperature fluctuations are extreme due to the time difference, installation is carefully timed for after 4 p.m., ensuring that the pipes have enough time to settle before backfilling begins. This approach effectively mitigates the risk of pipe shrinkage-related failures.

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