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So something I have problems with is my pipe layouts. I hate how parallel pipes automatically connect to each other when they're intended to carry different liquids. While I could just keep them a space apart to avoid them connecting, I find the extra space they take up quite inconvenient. Underground pipes won't connect, so that's also sorta a solution, but if you have a lot of pipes I find using too many underground pipes makes me lose track of what's going where (despite the extra info you get from hitting Alt).
What do you guys usually do when building up your liquid transport network?