regarding procurement of oxygen ( o2 ) gas filled departmental cylinders for 1x660 mw unit, htps, kasimpur -oxygen gas filled departmental cylinders for 1x660 mw unit, htps oxygen gas filled departmental cylinders for 1x660 mw unit, htps, kasimpur , supply of oxygen ( o2 ) filled gas cylinders with following details:- ( 1 ) . the purity o2 gas, to be filled in the cylinders, shall be at least 99.5%. ( 2 ) . the user division is having empty departmental cylinders. ( 3 ) . the capacity of each cylinder is 10 nm³. refilling @10 m3 { 210 ( approx. ) kg / cm2 ( g ) each cylinder with minimum purity 99.5% } . ( 4 ) . oxygen ( o2 ) gas confirming to is-7285 design standard and valve fitting is-3224 with latest revision.