bids are invited for supply of helium gas in npcil owned cylinders collection of empty dept helium cylinders and refilling of helium gas purified as per attached boq specifications. , hydrostatic stretch test and painting , replacement of damaged valve of helium gas cylinders . as and when required basis. , cleaning washing, pre-conditioning, heating, flushing, purging of helium gas cylinder. as and when required basis. , replacement of damaged valve guard cylinder caps of helium gas cylinder. as and when required basis. , greasing conditioning-application of anti- rust spray of cylinder body threads. as and when required basis. , painting and stenciling of cylinders. as and when required basis. total quantity : 2160