Enhanced Sealing Performance Weld Neck Flange ASME B16.5 DN80 Class 150
1. Product Description
A Weld Neck Flange is a type of pipe flange characterized by a long, tapered hub that is gradually welded to a pipe through a butt weld (a type of circumferential butt weld) . This design is integral for high-integrity applications. It is typically manufactured from forged steel for superior strength and is designed to handle high-pressure environments, typically ranging from 1 MPa to 25 MPa . The flange is part of two main international standard systems: the European system (PN series) and the American system (Class series) .
2. Key Product Parameters
Parameter Details
Types & Codes Weld Neck Flange (WN)
Applicable Standards HG/T 20592-2009 (European PN Series), HG/T 20615-2009 (American Class Series), GB/T 9115-2010, JB/T 82-94
Nominal Diameter (DN) Wide range available, commonly from DN10 upwards
Pressure Ratings European System (PN): PN10 to PN250 . American System (Class): Class 150 to Class 2500 .
Sealing Face Types Raised Face (RF), Male-Female (MFM), Tongue-Groove (TG), Ring Joint (RJ) . The RJ face is often used for pressures above PN160/Class 600 .
Common Materials Carbon Steel, Stainless Steel (304, 304L, 316, 316L, 321), Alloy Steels (Chrome-Molybdenum, Chrome-Molybdenum-Vanadium) .
Manufacturing Process Forging .
3. Product Applications
Weld Neck Flanges are designed for demanding services and are widely used in:
High-Pressure and High-Temperature Pipelines .
Pipelines transporting flammable, explosive, or toxic media .
Applications with significant temperature or pressure fluctuations .
Critical industries such as Petroleum & Gas, Chemical Processing, Pharmaceutical, and Shipbuilding .
4. Product Advantages
Excellent Strength and Stress Distribution: The long, tapered hub provides a smooth transition from the pipe to the flange, significantly reducing stress concentration and increasing the flange's rigidity and resistance to deformation .
Superior Sealing Performance: Robust construction and various sealing face options make it ideal for maintaining a leak-tight seal in severe service conditions .
High-Integrity Connection: The butt weld connection offers a full penetration weld, which has higher fatigue strength and is more reliable than fillet welds, making it suitable for applications with vibration and bending moments .
Durability: Can withstand high pressure (up to ~25 MPa), high temperature, and repeated cycling
![High Quality Raised Face Weld Neck Flange]()
FAQ
Q. Do you accept OEM service? A: Yes, we do.
Q. Can I get free samples? A: Yes, And you only need to bear the delivery costs, if the samples are not too big.
Q. Can I have my own Logo on the product? A: Yes, we're the professional manufacturer, so the OEM service is available.
Q. What information should I let you know if I want to get a quotation? A: Size, Design standards, materials, packaging, quantities, etc... Please send us some pictures and designs for checking if possible so we can do best as your request. Otherwise, we will recommend relevant products with details for your reference.
Q: What is your terms of delivery? A: We accept EXW, FOB, CIF, etc. You can choose the one which is the most convenient for you.
Q: What's the package and how do you ship the goods? A: Usually based on your requirements, such as wooden pallets We usually take a boat. Air transportation is also optional and can be adjusted according to demand.
