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
• Reinforced Structural Design: With a cylindrical neck, it has higher strength than ordinary flat welding flanges, can disperse welding stress, has excellent bending resistance, and reduces the risk of pipeline deformation.
• Easy and efficient installation: The sliding sleeve design allows for direct insertion into the pipe end before welding, resulting in a high degree of standardization, compatibility with various pipe specifications, and significantly reduced installation time.
• Reliable sealing performance: The smooth flange surface can be used with various gaskets such as rubber gaskets and spiral wound gaskets. Combined with bolt tightening, it effectively ensures the sealing of pipe connections.
• Diverse material options: Covering 304/316 stainless steel, carbon steel, alloy steel, etc., it possesses excellent corrosion resistance and high-temperature resistance, making it suitable for complex working conditions.
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.
