Why do gas pipelines run straight for a few hundred metres/yards then do a bit of a U-bend, straight run for a bit, then another U-bend etc. Why the bend? No valves or anything where the bend is.

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Why do gas pipelines run straight for a few hundred metres/yards then do a bit of a U-bend, straight run for a bit, then another U-bend etc. Why the bend? No valves or anything where the bend is.

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