I. Execution Standards：

   This product is manufactured in accordance with authoritative industry standards from multiple countries, as follows:

   International Standards: ANSI / ASME B16.5 (NPS 1/2 to NPS 24)

     • Applicable to: NPS 1/2 ~ NPS 24 (inch diameter)

     • Pressure Ratings: 150, 300, 600, 900, 1500, 2500 LB

     • Applications: The most mainstream standard for petroleum, chemical, valve, and pipeline applications.

   International Large Diameter Standards: ANSI / ASME B16.47 (NPS 26 to NPS 60)

     • Applicable to: NPS 26 ~ NPS 60 (extra-large diameter)

     • Applications: Large pipelines, storage tanks, power plants, long-distance pipelines

   European Standards: DIN 2501 / 2543 / 2545 / 2632 / 2633 / 2634 / 2635 / 2636 / 2637 / 2638

     • Pressure: PN6, PN10, PN16, PN25, PN40

     • Structure: Plate flange, neck flange, blind flange, sliding flange, etc.

   EU Latest Standard: EN 1092-1

     • Type: 01~04 Plate flange, neck flange, blind flange, etc.

     • Pressure: PN6~PN100

   Chinese National Standards: GB / HG / SH / JB (Chinese Standards)

     • GB: National Standard (General)

     • HG: Chemical Industry Flange (Most Commonly Used in Chemical Industry)

     • SH: Petrochemical Industry (Sinopec, PetroChina)

     • JB: Machinery Industry (Old Machinery Industry)

II. Product Features

   • Supports full-dimensional customization, allowing for tailored flange shapes, connection structures, and sealing surface types to meet specific working conditions and non-standard piping systems, perfectly matching individual needs;

   • Manufactured using high-precision CNC equipment, ensuring high flange surface flatness and bolt hole position accuracy, guaranteeing reliable sealing under complex working conditions;

   • Can be combined with various sealing structure designs, such as raised face and tongue/groove surfaces, to adapt to sealing requirements under different pressures, temperatures, and media environments.

III. Pressure Ratings

   • ANSI Class: 150, 300, 600, 900, 1500, 2500

   • PN: 6, 10, 16, 25, 40, 63, 100, 160, 250, 320, 400

IV. Material Range

   Carbon Steel:

      A105, American Standard Carbon Steel (corresponding to B16.5)

      A350 LF2/LF6, American Standard Low Temperature Carbon Steel

      A694 F42/F52/F60/F65/F70, American Standard High Pressure Forging Carbon Steel (Pipeline Steel)

      20#, Commonly Used Carbon Steel in Chinese Standards

      16Mn, Chinese Standard Low Alloy High Strength Carbon Steel

   Alloy Steel (High Temperature/High Pressure):

      A182 F11, F12, F22, American Standard Chromium-Molybdenum Heat-Resistant Alloy Steel (Power Plants, High-Temperature Steam)

      15CrMo / 14Cr1Mo / 12Cr1MoV, Chinese Standard Heat-Resistant Alloy Steel

      20MnMo, Chinese Standard Alloy Structural Steel

   Low-Temperature Steel (Sub-zero Environments)：

      16MnD, Low-Temperature Carbon Steel

      09MnNiD, Low-Temperature Low-Nickel Steel

      10Ni3MoVD, Cryogenic High-Strength Steel

    Stainless Steel (Corrosion Resistant):

       A182 F304 / F304L, 304 / Low-Carbon 304

      A182 F316 / F316L, 316 Molybdenum Stainless Steel (Better Corrosion Resistance)

      S32168, Chinese Standard 321 Stainless Steel (Titanium Stabilized)

   Special Alloys (Strong Corrosion):

      Hastelloy C276, Super Corrosion-Resistant Alloy

      N08367 (AL-6XN), High-Molybdenum Super Austenitic Stainless Steel

V. Size Range

      1.1/2" (DN15) ~ 60" (DN1500)

     • Inches: Minimum 1.5 inches, maximum 60 inches

     • Nominal Diameter (DN): Minimum DN15, maximum DN1500

     👉 Coverage: Small diameter → Medium diameter → Extra-large diameter flanges/fittings can all be made.

      Custom Sizes Supported

      Sizes not included in the standard sizes (e.g., 8", 18", 42", etc., non-standard/non-national standard) can be customized according to drawings or requirements.

VI. Quality Control and Inspection (Mandatory for Factory Shipments)

    Dimension Inspection

   Check: Outer diameter, inner diameter, thickness, bolt holes, sealing surfaces, etc., to ensure they meet standards.

   • Tensile, Impact, and Hardness Testing

   Check material strength, toughness, and hardness to ensure it will not crack or break.

   •  Ultrasonic Testing (UT) / Penetrant Testing (PT) / Magnetic Particle Testing (MT)

   Check for internal/surface cracks, porosity, and defects:

   •  UT: Checks for internal defects

   • PT: Checks for surface opening defects (commonly used for stainless steel)

   • MT: Checks for surface defects (commonly used for carbon steel)

   Material Analysis (PMI)

      On-site composition analysis using instruments to ensure the material is genuine (304 is 304, 316 is 316).

   Certificate of Quality Compliant with EN 10204 3.1 Standards

   EU-recognized formal material certificates.

VII. Application Areas

   The products are mainly used in the petroleum, chemical, power plant, pipeline engineering, shipbuilding, and water treatment industries.

   They conform to international standards, have stable quality, and can withstand various harsh working conditions such as high pressure, high temperature, and corrosiveness.

VIII. Packaging and Delivery

 Packaging method: Wooden crate packaging or pallet + waterproof membrane wrapping

 Suitable for export transportation, providing protection against collision, moisture, and rust.