bids are invited for h2 co2 n2 gas and associated service gas,chem,hydrogen,gr2 , hydro stretch testing and its certificat , cylinder painting and stamping charges , cylinder valve replacement including pur , cylinder valve spindle replacement inclu , replacement of valve safety guard of hy , cylinder cleaning with oil in valve , cylinder gland nut replacement , cylinder valve ptfe washer replacement , cylinder valve brass washer replacement , cylinder dead nut replacement , drilling out of broken valve , gas,chem,nitrogen,is1747 , gas,chem,carbon dioxide,25 35kg , hydrostatic strech test charges for cyl , replacement of cylinder valve cap , painting of cylinder in double coating , replacement of cylinder valve spindle , replacement of cylinder valv total quantity : 60060