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.
In: 7658
Thermal expansion bend. Another way to do it without a bend is to use a metal bellows expansion joint: [http://www.gopsi.com/site/1905gops/FH_Thermal_Exp_Piping_Sys-Part1.pdf](http://www.gopsi.com/site/1905gops/FH_Thermal_Exp_Piping_Sys-Part1.pdf)
(This is one of those less-smart points people try to score against Hyperloop… that thermal expansion is unsolvable, when in reality you can just use a metal bellows…. the more-smart point is it’ll be insanely expensive for much the same reason that High Speed Rail is, and you’d get much of the benefit but with far less cost at lower speeds and therefore without a need for vacuum.)
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