If you have another spare cornie why not gas that up to say 80PSI and use that to pump the beer out of the cornie with beer in. :) It's certainly a lot lighter than a C02 bottle! Sorry, just thinking laterally. :)
I presume that you are talking about C02 in relation to the quote "not for human consumption"? C02 is C02 regardless of its intended application. Many people use welding C02 and many use fire extinguisher C02. It's all the same stuff.
I personally think 3+ weeks is too long and too much yeast is dropping out of suspension and leaving you little to perform secondary fermentation. I use cornie kegs and force carbonate so I don't suffer this issue but one beer that I've left in the primary FV has been there for 17 days and early...
Yes I apologise, I over-simplified the problem. I carb at 25PSI for 3 days at a room temperature of 19c (about 76f) then just leave it. It can be chucked in a cupboard or in a fridge, it makes no difference, just serve at 5-8PSI thereafter.
I think you're complicating issues. Forget what volume you want at final temp, carb at current temp for 3 days minimum (1 week better). Carb it at whatever temperature it's sat at and that's it, serve at that via a chiller or put it in a fridge and serve.
I know I'm going to get shot down for not using keg lube but I run 12 kegs and have never yet had to replace any seals. Once the keg is filled, hit it with 30PSI and purge a couple of times then force carb as normal. It's that 30PSI that's needed to make the seal, not 'lube'. I've not yet had to...
Against all the advice here I never use keg lube and only strip the cornie once every 5 or 6 brews. I clean the keg with regular washing up liquid and water and sanitise with a videne solution ensuring all internal surfaces of the keg come into contact with the solution (takes 1 minute of...
It could also be the line. 3/16th's offers great resistance and less foam over 3/8th's line. It's a matter of balancing pressure and resistance over a given length and diameter of line aswell as temperature.
If the lines don't have individual cut-offs then fit the pipe and a cornie disconnect to each one, the only disconnects that will allow gas through in that situation would be the ones connected to cornie kegs.
You could do that but you'll probably end up with an over-carbonated beer. I would hit it with 20-25PSI for two days then just store it until needed with no further changes to the pressure. It will likely drop over time to 5-8PSI and remain constant at that until you decide to tap it.
Don't shake it unless you're in a real rush to carbonate it as it gives the beer a carbonic bite. Follow the advice up above and allow it to carbonate steadily over 3-4 days then store until ready to drink.
Efficiency is calculated on the final estimated and actual quantity and the final estimated SG and actual SG so I'm afraid it can't be calculated at this point. Good luck on your first brew though, it's all good fun. :)