• No. 99 Yilan Rd., Xiamen , CN.

Why Us for Large Flanges

  • Up to 10,000 mm

    Large OD & high-thickness flange fabrication capacity.

  • Advanced CNC Machining

    Precision machining with multi-axis lathes & VTLs.

  • Certified Quality

    ASME, API, EN 1090, ISO 9001, AWS, DNV.GL Certified.

  • Global Projects

    Serving oil & gas, power, marine & energy sectors worldwide.

    • Request Free Quotes With Drawings

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Overview of Large-diameter flanges

Large-diameter flanges are essential connection components used in pipelines, pressure vessels, heat exchangers, and heavy-duty mechanical systems across industries such as oil & gas, power generation, petrochemical, marine, and offshore platforms. We specialize in the custom manufacturing of high-integrity large flanges—engineered to handle extreme pressure, temperature, and corrosive environments.

Manufacturing Capabilities

Our large flange production facilities are equipped with high-capacity CNC lathes, vertical turning centers, and boring mills to handle diameters up to 10,000 mm (392 inches) and weights exceeding 50 tons.

Machining and Dimensions

  • Size Range: Up to 10,000 mm OD (outer diameter)
  • Thickness: 640mm
  • Facing Types: RF (Raised Face), FF (Flat Face), RTJ (Ring-Type Joint), MF (Male-Female), TG (Tongue & Groove)
  • Bore and Groove Machining: Tapered or parallel bore as per custom specs

    • Flange Types We Manufacture

  • Weld Neck (WN)
  • Blind (BL)
  • Slip-On (SO)
  • Long Weld Neck (LWN)
  • Lap Joint (LJ)
  • Threaded (TH)
  • Orifice Flanges
  • Custom Segmental Flanges (multi-piece for oversized transport)

    • Welding & Fabrication

  • Welded Construction – Multi-segment welded flanges available for sizes exceeding single-piece forging capacity
  • Heat Treatment – Normalizing, stress relieving, quenching & tempering, and solution annealing available per specification

    • Testing & Quality Control

    Each flange undergoes comprehensive inspection and testing based on client requirements and applicable codes:
    Dimensional Verification: CMM or laser measurement for high-precision components
    Non-Destructive Testing (NDT):

  • Ultrasonic Testing (UT)
  • Magnetic Particle Testing (MT)
  • Dye Penetrant Testing (PT)
  • Radiographic Testing (RT) on welds

    • Applications

    Our large flanges are trusted by EPCs, fabricators, and OEMs for projects involving:

  • Subsea and offshore platforms
  • Oil & gas transmission pipelines
  • LNG and refinery units
  • Steam and gas turbines
  • Nuclear and fossil fuel power plants
  • High-pressure chemical reactors
  • Industrial water systems and cooling towers

    • Visit https://www.youtube.com/watch?v=PytktksNEqQ for more about our large flanges manufacturing capabilities.

    Contact us at [email protected] or call us at +86 186 5928 0806 for more information about large-diameter flanges and to receive a free project quote today.

    Our Full-Service Metal Fabrication: metal cutting and sheering, metal forming, bending, and rolling, welding, CNC machining, sheet metal assembly, and quality inspection

    Machining Services: Multi-Axis Machining, 5-Axis Machining, CNC Milling | Vertical and Horizontal, CNC Turning | Vertical and Horizontal, CNC Engineering, CMM Inspection

    Material Types: castings, forgings, fabricated weldments, billets, bar stock, and plate

    Metal Materials we worked: Stainless steel, Carbon Steel, aluminum, brass, bronze, chromium, copper, Monel, nickel, titanium, zinc, and many other superalloys.

    Certifications: ISO 9001, CE EN 1090-1, ISO 3834, ABS, AWS, API, ASME, DNV.GL.

    Industries Served: Mining, Construction, Oil & Gas, Power Generation, Marine, Automotive, Renewable Energy, Pulp & Paper, Bridge, Aerospace, Defense, Printing and Dyeing, Machinery, etc.