Also real ales with hand pumps don`t require CO2
If the beer pipe length is short then it can be directly drawn, if not like our local social club the hand pump is assisted with a CO2 fed pump to make them work. I have done cellar work where I was on the committee at our local social club for 10 years and used to regularly clean the beer pipes on a Saturday morning and other cellar work when my ex-missus for a time worked as the bar steward there.
Real ales don't need CO2 as it is a byproduct of the brewing process, but keg beer is sterile filtered and then carbonated with food grade CO2 so it has a much, much longer shelf life than real ale and can also be used immediately with the beer pipe valve either slid onto the barrel and then locked to open the sprung loaded valve or a clamping valve that you then press down to open the valve. IME the former a better as I've never known anybody soaked with a beer leak, where it is possible with the latter, although fortunately I never have been. Real ale needs to be tapped with a capped sterile tap with the air vent shut at least 24 hours before it is used so it has time to settle. When used the blanking cap is removed a spar ring and seal is added to the tap and a sterile spar is inserted into the barrel and the spar ring tightened, the beer pipe is then connected to the top of the spar and the vent valve opened. I've used two different types of spar, fixed depth where the holes are well above the bottom of the spar and adjustable where they are closer to the bottom with the spar having an adjustable spring clip that rests on top of the tap for the spar depth.
9 and 11 gal are easyish to move round the cellar 22 gal less so especially when you have a big delivery before Christmas and need to double stack the 22 gals.