procurement of filled oxygen, nitrogen, nitrous oxide, acetylene, argon, zero air gas cylinders and replacement cost of damage valve at 2x660 mw, stage ii, sstpp, mppgcl, dongalia. , procurement of filled oxygen, nitrogen, nitrous oxide, acetylene, argon, zero air gas cylinders and replacement cost of damage valve at 2x660 mw, stage – ii, sstpp, mppgcl, dongalia. , oxygen gas – is 309, purity 99.9% (volume of gas 07 m3 oxygen gas per cylinder) , replacement cost of damage valve , nitorgen gas, is: 1747 – 1972, purity 99.999% (volume of gas 07 m3 nitrogen gas per cylinder) , nitrous oxide gas, purity 99.90% (volume of gas 07 m3 nitrous oxide gas per cylinder) , acetylene gas, is: 308 – 1988, purity 99.90% (volume of gas 07 m3 acetylene gas per cylinder) , argon gas, is 5760: 1998, purity 99.999% volume of gas 07 m3 argon gas per cylinder) , zero air gas, purity 21% oxygen + balance nitrogen (volume of gas 07 m3 zero air gas per cylinder)