his view is that buffer tanks or any other part of the system opperating above 3.4 bar may in theory need to tested and certified.

Does this mean they dont need to in the rules but theroeticaly there should be a rule about it?

I wouldnt have thought they would allow butane bottles to sell without a certification of some form?

I have seen loads of robots over the years using butane canisters fo buffers, and i dont think they were told to remove them? Not sure but i dont think so.

QUOTE-JB(and a lot more common sense than many of the people I know,)
Ouch JB, burning out a compressor every time its used? Wouldnt it be more sensible to invest a few pounds in a pressure switch to save buying a new compresser every fight?

**** If I was starting to build a new robot, I would be greatfull with help and guidlines on doing so, NOT Greatfull for people trying to push another idea to me, especially when it comes down to people putting personal coments on to pursuade me to to take their ideas because they either want recognition or money.

Im sure everybody can put down experiences, and some mch more outstanding ones! but thats not what advice is about, its to help others.
I would advise you away from CO2 to start with for obviouse safety reasons, but a setup like dave mentioned, they can be just as good fun.

Good Luck
Grant-Ploughbot