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ASME B16.5 Weld Neck Flanges for High Pressure Oil and Gas Pipelines custom

ASME B16.5 Weld Neck Flanges for High Pressure Oil and Gas Pipelines Manufacturers

-- Steady & Reliable Manufacturer --

High-Integrity Weld Neck Flange Solutions

Weld Neck Flanges (WNF) are the preferred choice for severe service conditions involving high pressure, sub-zero or elevated temperatures, and constant mechanical stress. Our ASME B16.5 compliant Weld Neck Flanges are characterized by a long tapered hub that provides a gradual transition from the flange thickness to the pipe wall thickness. This design significantly reduces stress concentration at the base of the flange and directs the stress to the pipe itself. As a specialized manufacturer, we ensure the bore of the flange matches the pipe's internal diameter, which minimizes turbulence and erosion within the pipeline. Whether forged from high-yield carbon steel or corrosion-resistant alloys, these flanges provide a high-integrity connection that is essential for the safety and longevity of cross-country oil and gas transmission networks.

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Technical Specifications

ParameterSpecification Detail
StandardsASME B16.5, ASME B16.47, MSS SP-44
Pressure ClassesClass 150, 300, 600, 900, 1500, 2500
Material OptionsASTM A105, A350 LF2, F304/L, F316/L, F51/F53
Size Range1/2" to 60" (DN15 - DN1500)
Face TypesRaised Face (RF), Ring Type Joint (RTJ), Flat Face (FF)

Oil & Gas Applications

These flanges are specifically engineered for midstream and upstream oil and gas infrastructure where leak prevention is a non-negotiable safety requirement. They are the standard connection for high-pressure crude oil trunklines and natural gas compressor station manifolds. In refinery units, they are utilized in hydrocrackers and catalytic reformers where thermal cycling occurs. Their robust design also makes them suitable for offshore riser systems and subsea manifolds where they must resist extreme external hydrostatic pressures. Additionally, they are used in high-pressure steam distribution systems for power generation. Because the tapered hub provides structural reinforcement, these flanges are ideal for any piping system subject to significant vibration, surging flow, or heavy mechanical loads.

Structural Advantages

  • Stress Distribution: The tapered hub effectively transfers stresses to the pipe, reducing the risk of flange deformation under pressure.
  • Superior Fatigue Resistance: Ideally suited for systems with extreme temperature fluctuations or frequent pressure surges.
  • Leak-Proof RTJ Sealing: Available with Ring Type Joint faces for ultra-high pressure applications where a metal-to-metal seal is required.
  • Reduced Turbulence: The matched bore eliminates internal ridges, preventing localized erosion and pressure drop.

Trade & Logistics Info

We support payments via T/T, Irrevocable L/C at sight, and CAD. To prevent damage to the critical weld bevel and sealing face, each flange is coated with anti-rust oil and protected with plastic or wooden covers. Small batches are packed in reinforced cartons, while large-diameter flanges are secured on custom-built seaworthy pallets or in plywood crates. We ship from major ports such as Shanghai or Qingbo, offering worldwide delivery. Every shipment includes 3.1 Mill Test Certificates, heat treatment charts, and ultrasonic testing (UT) reports for high-pressure classes. Our logistics team handles all customs documentation to ensure a smooth transition from our factory to your project site.

  • Q: Why choose a Weld Neck Flange over a Slip On Flange for gas lines?
  • A: Weld Neck Flanges have a tapered hub that offers better stress distribution and fatigue resistance, making them safer for the high-pressure and high-risk conditions found in gas transmission.
  • Q: Do you offer RTJ (Ring Type Joint) faces?
  • A: Yes, we provide RTJ faces for Class 600 and above, which are standard for ultra-high pressure oil and gas applications.
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Jiangyin Gaoxin Pipe Fittings Co., Ltd.
About Us
JIANGYIN GAOXIN PIPE FITTINGS CO.,LTD.
Our company is a professional manufacturer of pressure piping components. As ASME B16.5 Weld Neck Flanges for High Pressure Oil and Gas Pipelines Manufacturers，Our product range covers butt-weld, socket-weld, and threaded pipe fittings, including flanges and customized non-standard parts. These products are widely used in industries such as oil & gas, chemical processing, power generation, shipbuilding, papermaking, metallurgy, pharmaceuticals, and food processing. We manufacture according to standards such as ASME, EN,JIS,DIN,ANSI,GOST, MSS, GB/T,HG, DL, SH, SY,and have a complete range of inspection equipment, a strict quality control system, and various certifications（PED,AD2000,EAC, ABS,BV, DNV,NORSOK M650, ISO9001,ISO14001,ISO45001,etc.）, making us a leader in the industry.

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