Just tried to calculate it... Dunno if I got it right.
1.93 grams CO2 per litre at 1 atm = 38 grams to fill a 20L keg (inc headspace).
at 2.2 volumes that's about 84 grams to carbonate.
Dispense usage would depend on serving pressure.
at 50kpa a fully dispensed keg should hold 1.5 keg volumes of CO2 if allowed to expand until it reaches atmospheric pressure = 57 grams.
at 70 kpa = 65 grams
so a carb and dispense for one keg = 141 grams
6.8kg / 0.141 = 48 kegs
at 70kpa dispense pressure = 45 kegs
assuming no wastage and no usage for transfers etc.
usage for a transfer would be same calc as for dispense usage I guess... This is assuming you're burping the receiving keg to let it flow all the way through.
((Transfer pressure + 100kpa) / 100kpa) * 38 grams
so the slower you are willing to transfer the less gas you'll use.
1.93 grams CO2 per litre at 1 atm = 38 grams to fill a 20L keg (inc headspace).
at 2.2 volumes that's about 84 grams to carbonate.
Dispense usage would depend on serving pressure.
at 50kpa a fully dispensed keg should hold 1.5 keg volumes of CO2 if allowed to expand until it reaches atmospheric pressure = 57 grams.
at 70 kpa = 65 grams
so a carb and dispense for one keg = 141 grams
6.8kg / 0.141 = 48 kegs
at 70kpa dispense pressure = 45 kegs
assuming no wastage and no usage for transfers etc.
usage for a transfer would be same calc as for dispense usage I guess... This is assuming you're burping the receiving keg to let it flow all the way through.
((Transfer pressure + 100kpa) / 100kpa) * 38 grams
so the slower you are willing to transfer the less gas you'll use.
