Expansion and contraction of the pipe due to temperature changes.
A 100m piece of pipe will expand or contract about 5cm with a 40C temperature change. Depending where you are, the coldest winter temp to the hottest summer can easily see that.
The bends allow enough flex in the lines to let them move freely and not buckle.
https://www.engineeringtoolbox.com/linear-thermal-expansion-d_1379.html – calculator for expansion at different temps.
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