supply , refilling of carbon dioxide gas cylinders and hydrogen gas cylinders for htps , kasimpur , supply & refilling of carbon- dioxide gas as per is: 307/1966 with latest revision , dry & purity 99 to 99 . 9% in empty cylinders given by the nigam . each cylinder must contain 30/20 kg carbon dioxide gas ( co2 ) corresponding to 10m3 at atmospheric pressure . , supply & refilling of the hydrogen gas confirming as per is:1950-65 grade- i and purity 99 . 90% with latest amendment thereof and as per following composition :- ( i ) water: mg/m3= 10 maximum ( ii ) oxygen:% by volume=0 . 0010 maximum ( iii ) co2: %ppp volume= 10 maximum ( iv ) hydrogen: % by volume = 99 . 90 minimumnote: hydrogen gas will be filled in compressed condition at approx . 155-160 kg/cm2 pressure and temperature 15 degree c to be filled in empty department cylinders . capacity of cylinders: 7 cubic meters . ( 4357cylinders x7 m3 )