carrier gas helium(92 percentage) - hydrogen(8 percentage) mixture - refilling , refilling ofcarrier gas mixturein mfl cylinders . 8% iolar grade hydrogen and 92% helium mixture in 47 ltrs (or) 50 lts water capacity and gas pressure140 kg/cm2 with test certificate gas volume: 7m3per cylinder as per safety norms. stability period:12 months it is mandatory to supply all the cylinders with valve caps inclusive oftransportation charges from & to mfl stores , replacement charges with material(if required) , replacement of cylinder valve- (brass), , replacement ofvalve guard , replacement ofspindle , replacement of gland nut , replacement of cylinder neck ring , hydrotesting&preconditioning charges