ultra pure oxygen collection of empty npcil/departmental cylinders, qa checks, refilling and supply of ultra pure oxygen gas , collection of empty npcil departmental cylinders, qa checks, refilling and supply of ultra pure oxygen gas having purity 99.9 percentage volume by volume as per attached technical specifications and scope of work , collection of empty npcil departmental cylinders, qa checks, refilling and supply of ultra pure oxygen gas having purity 99.9 percentage , replacement of faulty-damaged valve of ultra-pure oxygen gas cylinders on as and when required basis , hydrostatic test as well painting of ultra-pure oxygen gas cylinders on as and when required basis , washing, heating and purging of cylinder before filling of gas