procurement of da, o2 , n2 and co2 gas under gs group for the year 2025-26. , oxygen gas as per is 309/2005 (4th rev.) purity of compressed oxygen gas should be minimum 99% by volume. the gas shall be free from moisture and its due point should be minimum 0 °c, to be filled in7m3 empty cylinders of ggsstp.note- (814 nos cylinders each cylinder of 7m3 capacity) ±5% variation , dissolved acetylene gas (d.a. gas) for industrial use as per is-308/1988 (3rd rev.) with amendment 1 in cylinders. the gas shall be free from moisture and its due point should be minimum 0 °c to be filled in 7m3 empty cylinders of ggsstp.note- (184 nos cylinders each cylinder of 7m3 capacity)±5% variation , carbon dioxide gas (co2) is: 307/1966 (grade2) to be filled in ggsstp empty cylinders of capacity 3/6/18/22 kg as per ggsstp requirement.note-±5% variation , nitrogen gas ‘a’ grade 99.9% pure in cylinders of 6.6 m3 at 130-140 kg/cm2pressure be free from moisture and its dew point should be minimum (-) 500°c. note- (41 nos cylinders each cylinder of 6.6m3 capacity)±5% variation