Gerard,
Just out of curiousity what did you settle on? Was it the Blichmann fermenter from ibrew or something else?
sap.
Just curious, does building the pressure up like that hurt the yeast ? All this talk you hear of pressure being bad for the yeast, though I know spunding works. And with the 1.5bar of pressure, is there a chart somewhere that tells you how many vols of CO2 that puts into your beer.
Regards your 'pressure vessel', with your fairly unique set of requirements it could be best to go custom, don't think too many off the shelf conicals are going to come with a CIP spray ball. If you added it afterwards you'd be violating the AS1210 code wouldn't you ? I haven't had a lot to do with the pressure code, we did look into it once as a piece of equipment we were making had the potential to go bang in a big way and thus needed to cope with the pressure. As a 'one off' use like that it wasn't all that expensive to get it hydrostatically proof tested (with water) and voila, you comply with AS1210. For a continuous use item, might be a little more involved. I think there's something in the code about being less than a certain pressure, means it's not classified as a pressure vessel, thought this was ~2bar, could be worth investigating.
The road to pressure vessel certification is not one I'd be that keen on walking on if you could avoid it.
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