A Two-Mile Beer Pipeline Carries Belgium’s Lifeblood to Be Bottled
nytimes.com
nytimes.com
Sorry, I'm a little tired.
1) Winzerer Zelt: 250m (http://www.abendzeitung-muenchen.de/inhalt.oktoberfest-winze...)
2) Bräurosl: 240m (http://www.abendzeitung-muenchen.de/inhalt.wiesn-bier-pipeli...)
3) Hackerzelt: 250m (http://www.oktoberfest-live.de/festzelte/bier-pipeline-fuers...)
I believe that this year the workers installed more beer pipelines (kinda makes sense, given the terrorism threat and the heavy restriction on vehicular traffic), but can't find any numbers.
In much the same way they (or in some cases don't) clean the lines at your local bar.
Poly pipe is pretty good for being non-porous and difficult for much to grab onto or grow inside - Oil & Gas uses poly lined steel pipes frequently where microbially induced corrosion is an issue (various extremophiles that live in the reservoirs that like to eat iron and shit acid, etc).
And as a Dutchman living close to both borders, I'll say I'm not surprised Belgium is second.
(may or may not be real)