STEEL TUBE AND PIPE HANDBOOK - February 2012

102 The weld The pipes are by double submerged-arc-welding process produced (longitudinal seam). Value of seam is v = 0,75 – 1. Pipe ends Pipe shall be furnished with ends according to standards: DIN 2559 – 22 API 5L EN 10 208-1, 2 ČSN, STN 13 1075 (T < 10 mm without beveling or according agreement) Anti-corrosion coatings The pipes are delivered: • without anti-corrosion coatings • with anti-corrosion coatings: – standard bituminous coating – bitumen + fiberglass (20 kV) – bitumen + double fiberglass (25 kV) – bitumen + impregnated paper + fiberglass (25 kV) – bitumen + PVC + fiberglass (35 kV) – according to standard DIN 30672 – painting – polyethylen coating (in cooperation) Inspection Testing is performed in accordance with corresponding standards. Following tests are performed: visual control of weld and surface condition, control of dimensions, mechanical testing of steel plate material and weld joint (tension test, Charpy V – notch test, bend test), hydrostatic test, nondestructive examination of weld joint, testing of isolation. Other tests by agreement. Marking There are following information stamped on the pipe: • producer • dimension: outside diameter x wall thickness • steel grade • heat number • production pipe number • sign of technical control • sign of welder Certification Test report certificate in accordance with the specification: DIN 50049, EN 10204, ASTM A 530, API 5L. Other products of the mill Besides longitudinally welded large diameter pipes, the mill provides following services and products: • parts of stable pressure vessels • welded elbows, reducers and other fitings • pipeline with flanges • irrigation pipes (zinc coated, with demountable joints) • isolation of another pipes and fitings