bids are invited for refilling of industrial gases in cylinders - co2 gas (ultra high pure) 99.99%; kilogram (kg) - refilling and supply of carbon-di-oxide gas 99.9 % v/v(minimum)purity for agms in npcil cylinders as per attached pecifications : pc-e-654, rev.4 (cylinder of 30 kg). pre conditioning of all npcil cylinders to be done before filling as given in specification sheet pc-e-654, rev.4 & annexure-1,2 &3 (terms and conditions) , replacement of damaged valve of gas cylinder for carbon-di-oxide gas cylinder during co2 gas filling. {as and when required} , hydro static test of agms carbon-di-oxide gas cylinder. {as and when required} , testing of co2 gas in hydrotested gas cylinders. {as and when required} , replacement of damaged valve guard for carbon-di-oxide gas cylinder. {as and when required}