tender for procurement of compressed carbon-di-oxide (co2) gas for stage-1,2&3 for and its cylinder maintenance for two years through open tender. , procurement of compressed carbon-di-oxide (co2) gas for stage-1,2&3 for and its cylinder maintenance for two years through open tender. , carbon-di-oxide (co2) gas ( purity:99.8 to 99.9% co2 gas i) purity: 99.8 to 99.9% by wet chemical test. ii) moisture: 5 ppm max. by dew point apparatus, iii) odur test : suitable for industrial use, iv) standard : confirming to is: 307,1966 ) , replacent of def/bent/damaged valves , replacement of def/broken top spindle , replacement of def/broken bottom spindle , replacement of defective gland nuts , cylinder hydraulic testing charges , cylinder painting charges