The JCO pipe production line — often called a JCO PIPE MACHINE LINE — is a specialized automatic forming line used to manufacture large-diameter longitudinally welded pipes (commonly for oil, gas, or structural applications). The term “JCO” refers to the forming sequence of the steel plate into a circular pipe shape:

🧩1. Process Overview

  1. Plate Edge Milling Machine
    • Bevels and straightens both edges of the steel plate to ensure welding accuracy.
  2. Pre-Bending Machine
    • Bends both edges of the steel plate slightly before JCO forming, ensuring smooth curvature transition.
  3. JCO Forming Press
    • The plate is pressed sequentially into the shapes of “J”, “C”, and “O” by a hydraulic forming press.
    • The “J” and “C” shapes are formed from both sides toward the center, then closed into “O”.
    • This step defines the roundness and dimensional precision of the pipe.
  4. Tack Welding Station
    • Temporary welds the open seam to hold the shape before final welding.
  5. Inside & Outside Longitudinal Seam Welding
    • Usually submerged arc welding (SAW) for both inside and outside seams.
  6. Mechanical Expanding Machine
    • Expands the pipe to final size, improves roundness, and relieves internal stress.
    •    
  7. Hydrostatic Test, UT, and X-ray Inspection
    • Ensures the pipe’s pressure strength and weld integrity.
  8. End Facing & Beveling Machine
    • Machines pipe ends for precise fit-up and coating preparation.

⚙️ 2. Technical Parameters (Typical Example)

Parameter Specification
Plate Thickness 6 – 40 mm
Plate Width 1500 – 3000 mm
Pipe Diameter 406 – 1626 mm (can be customized up to 2020 mm)
Pipe Length 6 – 12 m
Forming Pressure 1200 – 3000 T
Welding Type Submerged Arc Welding (SAW)
Production Speed 2–4 pipes/hour (depends on diameter & thickness)

🧰 3. Main Equipment in the Line

  • Edge Milling Machine
  • Pre-bending Machine
  • JCO Forming Press
  • Tack Welder
  • Inside/Outside SAW Welding Station
  • Expanding Machine
  • End Beveling Machine
  • Hydrostatic Tester
  • NDT (Ultrasonic & X-ray) Units
  • Conveying and Lifting System
  • Control System (PLC + HMI)

🏭 4. Application Fields

  • Oil & Gas Pipeline
  • Water Transmission
  • Structural Steel Columns
  • Wind Tower & Offshore Projects

🌍 5. Advantages

  • High roundness and dimensional precision
  • Low residual stress and uniform wall thickness
  • Flexible for multiple diameters/thicknesses
  • Suitable for API 5L, EN 10219, and GB/T9711 pipe standards

One Case in UKRAINE:

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