Manufacturing technology of ERW, LSAW and SSAW steel pipe
ERW welded pipe manufacturing process ERW process normally applied to the pipe below 24 in, 609 mm. ERW/HFW Longitudinally Welding Steel Line Pipe (Electric Resistance Welding ) Manufacturing Flow Chart Uncoiling – Flattening – Shearing and Butt Welding – Loop Storing – Plate UT – Trimming – Forming – High Frequency Welding – Removal of Inside and Outside Blurs – Ultrasonic Testing – Annealed by Medium Frequency – Air Cooling – Water Cooling – Sizing – Straightness – Cutting Off – Dimension and Initial Surface Inspection – Pipe Ends Beveling – Hydrostatic Test – Ultrasonic Testing of Entire Tube – Off Line Ultrasonic Testing – Ultrasonic Testing for Pipe Ends – Dimension and Final Surface Inspection – Corrosion Resistant Coating – Marking – Pipe Ends Protection – Inspection and Warehousing LSAW pipe manufacturing process LSAW pipe applied to diameters from 20 in (508 mm) to 40 in (1016 mm). LSAW Welded Steel Line Pipe Manufacturing Flow Chart: Plate UT –...