comprehensive maintenance of gaseous type full vacuum chlorination system and refilling of chlorine gas cylinders at various urban stations under the jurisdiction of phed no.2 hisar and all other works contingent thereto.” (for a period of six years)- 1 credit for old 100 kg cylinders 2 credit for old 900 kg tonners 3 replacement of empty chlorine gas cylinder capacity 100 kg duly certified and approved by bis and explosive department govt. of india 4 replacement of empty chlorine gas tonner capacity 900 kg duly certified and approved by bis and explosive department govt. of india 5 refilling of chlorine gas cylinders/tonner including transportation, loading, unloading in all respect at site of work including ammonia check for leakage on site complete in all respect 6 comprehensive maintenance of full vacuum chlorination system of capacity 2000 gms/hr in all respect including replacement of any partfor each system 7 comprehensive maintenance of full vacuum chlorination system of capacity 5000 gms/hr in all respect including replacement of any part for each system