FWIW I've found the resistance of virtually every line out there to be somewhat less than stated, so if you use those figures in your calculations you may end up with lines that are slightly too short, and pours that are a little on the foamy side. My suggestion is to make the lines a little longer than you think you'll ever need them. The only downside to longer lines is a slower pour, and if it's too slow it's very easy to cut them down a little. Much easier than replacing lines that are too short and causing a bunch of foaming.
I have very long lines, because I never know when I'll want a hefe or belgian carbed to 3.5 vol and served at 40F, and would like to be able to get a good pour if/when I do that. Yes I get slightly slower pours, but I'm not running a busy bar where every second matters, and if I have time to drink a beer, I have an extra few seconds to wait for it to be poured. Just my $0.02 on the matter, take it for what it's worth.
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