Straight Seam Welded Pipe

ERW straight seam welded pipe, also known as “resistance welded straight seam welded pipe”, ERW straight seam welded pipe is mainly divided into two forms: ERW AC welded steel pipe and ERW DC welded steel pipe. ERW straight seam welded pipes are further divided into low frequency welding, intermediate frequency welding, ultra intermediate frequency welding and high frequency welding according to different frequencies. High-frequency welding is mainly used for the production of thin-walled steel pipes or ordinary thick-walled steel pipes. High-frequency welding is divided into contact welding and induction welding

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ERW straight seam welded pipes are generally used as wire sleeves in the power industry. Performance characteristics: 100% ultrasonic testing of the base metal ensures the inherent quality of the pipe body; there is no unrolling-disc shearing process, and the base metal is pressed. Less scratches; there is basically no residual stress in the finished pipe after the stress is eliminated; the weld seam is short and the probability of defects is small; it can conditionally transport moist sour natural gas; after the diameter expansion, the steel pipe has high geometric accuracy; After the forming is completed, it is performed along a straight line at a horizontal position. Therefore, the control of the misalignment, slitting, and perimeter of the pipe diameter is better, and the welding quality is excellent.

Types of Pipes and Tubular Goods

There are six types of pipes and tubular goods.

  1. Standard Pipe: There are three different types of standard metal pipes – welded (ERW Pipe), seamless pipe, and galvanized pipe. They represent 10% of all tubular products.
  2. Line Pipe: Used primarily in Oil and Gas Applications. Line pipe includes ERW, FW, SAW and DSAW Pipe. They are manufactured to API 5L Specification and are available in X42, X50, X60 etc. grades. They represent 21% of all tubular products.
  3. Oil Country Tubular Goods (OCTG): This includes drill pipes, tubing and casing. It is used in drilling and completion of Oil and Gas wells. OCTG are produced by ERW and Seamless manufacturing. OCTG represent 35% of all tubular goods.
  4. Pressure Tubing: used for industrial and pressure application. Pressure tubing are produced using seamless manufacturing. They represent 2% of all tubular goods.
  5. Mechanical tubing: used for mechanical and structural application and is produdced by ERW and seamless manufacturing. They conform to ASTM specification. Mechanical Tubing represent 17% of all tubular goods.
  6. Structural Tubing: used for support or retention purpose. This tubing can be round or square and are produced by ERW manufacturing. They are used for fences, construction and other misc. support needs. They represent 15% of all tubing goods.
  7. Weight of Pipe

    Weight of pipe is measured in pounds per foot or kilograms per meter. One should remember that weight of pipe in the ansi pipe size chart is “theoretical” weight and not an actual weight. Actual weight will vary based on the tolerance of pipe size.

    Formula to calculate weight of steel pipe is;

    W = [{OD-WT} x WT] x 10.69

    W = Weight per lineal foot

    OD = Outer Diameter

    WT = Wall Thickness

    Pipe Manufacturing

    Steel pipe is grouped in two main categories;

    • Welded Pipe
    • Seamless Pipe

    There are four main methods of producing metal pipe:

    1. Furnace Weld (FW). Also called Continuous Weld
    2. Electric Resistance Weld (ERW)
    3. Submerged Arc Weld (SAW), also DSAW
    4. Seamless (SMLS) method

You can have our straight-seam welded pipes cut to any desired length. Do you also need welding work, or do you want the tubes fitted with bell ends? No problem! At Reliable, we have a professional workshop to expertly perform all the common work on your pipes.
With Reliable Welding & Construction, we carry out the most common welding work. We are able, among other things, to extend the pipes by means of round seams, to attach drill points for (LEKA/TUBEX) pile foundations, length welding and placing spray nozzles, attaching (welding) flanges, welding on footplates, attaching steel sheet piles and much more! Feel free to ask about the options.
We work exclusively with qualified staff and materials of the highest quality. We also have a high-quality OP welding robot that can, if desired, weld under a powder deck (SAW).