Most OCTG produced for today’s market is made with the ‘ERW’ process, as opposed to ‘SMLS’ or seamless. Tallys allows for these classifications to be stored and tracked as ‘Grade’ definitions.
‘ERW’ or Electric Resistance Welding, is the group of welding processes which include spot and seam welding. The video contained in Ben Bryant’s blog shows a tubing machine producing stainless steel OCTG.
Ben Bryant Wrote:
In the oil and gas industry we basically use two different processes to produce tubing and casing. These products are commonly referred to as OCTG or “Oil Country Tubular Goods”. These two processes produce the products we normally designate as either “SMLS” (seamless) or ERW (Electric Resistance Welded). The majority of OCTG produced today is manufactured using the ERW process.
This video, by Sunfone, shows a stainless steel tubing machine hard at work:
In this process, a flat rolled “coil” is manufactured at a steel mill to the exact thickness required for the intended weight per foot of the pipe to be produced. The “coil” is delivered to the Pipe Mill and goes to the “slitter” which cuts or slits the flat stock to the desired width needed to produce the required pipe diameter. The slit flat stock is then uncoiled and fed through a series of forming dies and rolled into a cylindrical tube. In a continuous process the formed metal is then welded together by a process known as “electric resistance welding”. Hence, the term ERW.
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