Other kg 2

73.05 - Other tubes and pipes (for exam le, welded, riveted or similarly closed), having circular cross-sectrons, the externa diameter of which exceeds 406.4 mm, of iron or steel (+). r - Line pipe of a kind used for oil or gas pipelines : 7305.11 - - Longitudiially submerged arc welded 7305.12 - - Other, 1ongildinalIy welded 7305.19 - - Other 7305.20 - Casing of a kind used in drilling for oil or gas - Other, welded : - - Longitudinally welded 7305.39 - - Other 7305.90 - Other 7305.3 1 The tubes and pipes of this heading are obtained, for exam le, by welding or riveting preformed, unclosed, tubular shapes produced from flat-rolled pro ucts. B The tubular shapes can be produced : - - longitudinally or spirally in a continuous operation by means of a set of rollers, for flat-rolled products m colls; or longitudinally in a non-continuous operation by means of a press or rolling machine, for flat-rolled products not in coils. In the case of welded articles, the abutting edges are welded without filler rcetal b flash-welding, by electrical resistance or induchon welding, or by submerged arc weldlug wxt filler metal and flux or gas protection to prevent oxidation. As regards products obtained by riveting, the abutting edges are overlapped and joined by rivets. E The products of this heading may be coated with, for example, plastics or with glass wool combined with bitumen. They include line pipes of a kind used for oil or gas, casings for oil or gas wells, tubes for lon mains for coal or other solid materials, tubes for piling or structura distance waterlines or sl columns, as well as hydroe ectric conduits, usually reinforced with rings. The heading does not cover : (a) Tubes, pipes and hollow profiles, of heading 73.03,73.04 or 73.06. (b) Tube or pipe fittings of iron or steel (heading 73.07). (c) Tubes or pipes made up into specific identifiabIe articles.