rate contract for supply and refilling of medical gases at aiims rishikesh , oxygen ( o2 ) bulk cylinder , d type ( should have working pressure at 150 c: 150kgf/cm2 ) gas carrying cpacity -d/46 . 7 litres/7 . 1m3 , nitrous oxide ( n2o ) bulk cylinder , d type ( should have minimum capacity: 30 kg over and above tare weight ( 51 kg with necking ) of cylinder having 46 . 7 litre water capacity ) gas carrying cpacity -d/46 . 7 litres/30kg , carbon dioxide ( co2 ) bulk cylinder , d type ( should have mininum capacity of 30 kg over and above tare weight ( 51 kg with necking ) of cylinder having 46 . 7 litre water capacity ) gas carrying cpacity -d/46 . 7 litres/30kg , oxygen ( o2 ) b type cylinder ( should have working pressure at 150 c: 150kgf/cm2 ) gas carrying cpacity - b/10 litres/1 . 5m3 , oxygen ( o2 ) a type cylinder pin index 2 , 5 ( 5 ltr . ) ( should have working pressure at 150 c: 150kgf/cm2 ) gas carrying cpacity -a/4 . 6 litres/0 . 75m3 , nitrous oxide ( n2o ) a type cylinder pin index 3 , 5 ( 5 ltr . ) ( minimum: 1 . 5 kg over and above tare weight of 3 . 42 kg of cylinder having 4 . 6 litre water capacity . ) gas carrying cpacity-a/4 . 6 litres/1 . 5kg