Good morning Steve,
We are just commissioning our 20 bbl plant and all the pipework, fittings etc. are 1 1/2" as was our previous 10 bbl plant. We visited loads of small and large breweries (awful job but somebody has to do it) to get an idea of what we needed and just about all of them were 1 1/2" up to about 50 bbl. I think one of the considerations is the cost of valves and fittings. 1 1/2" being as common as moo poo, is relatively inexpensive, where as anything bigger is getting into the expensive 'rare as teddy bear turds' range. Things may of course be different on your side of the pond. After all, things are bigger in the USA! All my best wishes for your new plant. Martin


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