Weld Neck Flange is flanges that designed to be joined to a piping system by butt welding. This kind of flange include lots of specification.
Weld Neck Flange is expensive because of its long neck and cost of people for contact WN flange with pipeline or fitting but is preferred for high-stress applications. The necks, or hubs, transmits stresses to the pipeline.
The gradual transition of thickness from the base of the hub to the wall thickness at the butt weld provides important reinforcement of the Weld Neck Flange. The bore of Weld-Neck flange matches bore of the pipeline, reducing turbulence and erosion.
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Size
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1/2″ to 48″ DN10~DN5000
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Flange Standards
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ANSI, MSS, AWWA, DIN, UNI, JIS, BS, EN1092, GOST, SABS
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Pressure Rating
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Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS
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ANSI B16.5
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6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64
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JIS
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5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K
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UNI
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6Bar 10Bar 16Bar 25Bar 40Bar
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EN
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6Bar 10Bar 16Bar 25Bar 40Bar
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Coating
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Oil Black Paint, Anti-rust Paint, Zinc Plated, Yellow Transparent, Cold and Hot Dip Galvanized
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Process
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Forged
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Test Certificates
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Raw Materials Certificate
100% Radiography Test Report Third Party Inspection Report, etc |
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Production technique
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Forged, Heat treated and machined
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Types
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Weld Neck, Blind, Slip-On, Socket-Weld, Threaded, Orifice, Spectacle Blinds
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Uses & application
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Bitumen upgraders.
Heavy oil refineries.
Nuclear power (mostly seamless). Petrochemicals and acids. |
Choosing our company's Weld Neck Flange is a reliable guarantee for the safe, efficient, and long-term operation of your pipeline system. As a professional supplier of pipeline accessories, our weld neck flanges always focus on customer needs in terms of design, material, craftsmanship, and service.
1. More Suitable Structural Design for High-Pressure and High-Risk Scenarios
The neck of the weld neck flange is butt-welded with the pipeline, forming a continuous metal structure. This design makes it excellent in pipeline systems with high pressure, high temperature, flammable, explosive, or corrosive media:
The overall rigidity after welding is stronger, which can effectively disperse pipeline stress and reduce the risk of leakage caused by pressure fluctuations or thermal expansion and contraction.
The transition design of the neck reduces fluid resistance and avoids turbulence of the medium at the flange, which is especially suitable for transporting viscous and easily deposited media.
2. Material and Craftsmanship Ensure Ultimate Reliability
We strictly control raw materials and the entire production process:
The material selection includes various grades such as carbon steel, stainless steel, and alloys, which can be accurately matched to the characteristics of your medium. For instance, 316 stainless steel flanges are ideal for highly corrosive environments, while chromium-molybdenum steel flanges are better suited for high-temperature and high-pressure conditions.
The flange sealing surface is precision-machined to ensure a proper fit with the gasket. When combined with appropriate bolt preload, this enhances sealing performance and significantly reduces maintenance costs over time.
All products undergo non-destructive testing methods, including ultrasonic and magnetic particle inspections, and comply with both international and domestic standards, such as ASME and GB. This guarantees that each batch of flanges possesses stable mechanical properties.
3. Customized Services to Meet Special Needs
For the personalized needs of complex pipeline systems, we can provide:
Customized production of non-standard sizes and special pressure grades, such as thickened flanges for large-diameter pipelines or low-temperature steel flanges for low-temperature environments.
Supporting welding process guidance to help the construction team ensure welding quality and avoid flange failure caused by improper welding.
Perfect after-sales service, including product quality traceability and consultation on installation issues, to escort the whole life cycle of your pipeline system.
We look forward to working with you to provide the most suitable solution for your pipeline project.
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