Also meant to say, the reciever size doesn't make much difference unless it's for very short tasks, the CFM of the compressor is far more important. Some 200L compressors can blast all day, others won't run a blast pot for more than 20 seconds at a time. All depends on the CFM (or m3/hour if you want to be modern).Ive no delusions of running a big blast pot .
I bought a blast cabinet while back , i haven't got around to plumbing in , seller believed it needs 200 ltr + so wen i saw the 300ltr cheep and local i rushed in abit giddy, it's borderline scrap , chuck more money at it or buy new . Thinking the latter.
20 to 40 is about right for a small cabinet, but you should really have a 60cfm+ compressor (approx 10kw+), as otherwise the compressor will be working flat out just to maintain some kind of pressure in the receiver, and you will likely lose pressure at the workpiece. If a tool needs 40cfm you then it need a compressor larger than 40cfm for it to work properly. Remember this is the compressor's max output if it is pumping constantly, which is not what should be happening if you want any kind of longevity from it. It also doesn't consider losses in the pipework/hoses etc.all depends what preacher you need thre 200L at my blast pot need 170 cubic feet min at100psi with a 7/16 nozel most new compressers are rated at free flow no presher thats why sume 200L compresser can and some carnt run a blast cabint with the same rating I think most cabints need 20 to 40 cm at 100 psi to be afetive