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   Tasting Craft Beer (tastingcraftbeer@mastodon.beer)'s status on Sunday, 22-Oct-2023 16:59:41 JST Tasting Craft Beer

   When pouring beer from fermentation or lager tanks, more often than not the beer comes from a pipe that has a big spiral in it (pictured below). What is this for?

   #craftbeer #beer #beersofmastodon #daretoask

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     Sam Whited (sam@social.coop)'s status on Sunday, 22-Oct-2023 16:59:38 JST Sam Whited

     in reply to

     @tastingcraftbeer The other possibility is that it's heat exchanging and bringing the temperature down closer to room temp (more surface area in the pipe == more exposure to ambient temperatures), but this doesn't look like it would have enough surface area for that to be useful, so if I had to guess it's about pressure. Both of these are just speculation though.

     clacke likes this.
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     Sam Whited (sam@social.coop)'s status on Sunday, 22-Oct-2023 16:59:40 JST Sam Whited

     in reply to

     @tastingcraftbeer I am no expert, but at a guess the beer in the fermenter is likely at a much higher pressure than outside the fermenter. The spiral probably gives you a much longer pipe than would be practical if it was straight, meaning the pressure gradient is less steep (a gradual drop over a longer tube) than it otherwise would be so there's less foam.

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     Tasting Craft Beer (tastingcraftbeer@mastodon.beer)'s status on Sunday, 22-Oct-2023 16:59:43 JST Tasting Craft Beer

     in reply to

     • Sam Whited

     @sam thanks. Popular opinion supports the pressure hypothesis :)

     clacke likes this.