Weld Neck Flange

High-Integrity Connection for Pressure Piping

A Weld Neck Flange (WN Flange) is a precision-engineered flange designed for high-pressure and high-temperature applications. Characterized by its long tapered hub, this flange provides superior stress distribution and is ideal for use in critical pipelines and process equipment.

  • Tapered Hub Design
    Ensures smooth transition from flange thickness to pipe wall thickness, minimizing stress and reducing fatigue.

  • Secure Welded Connection
    Butt-welded to the pipe, creating a permanent, leak-proof seal ideal for hazardous or high-demand systems.

  • Material Options

    • Carbon Steel (ASTM A105)

    • Stainless Steel (304, 316, 316L)

    • Alloy Steel, Duplex, Super Duplex

    • Other exotic alloys available upon request

  • Standards & Ratings

    • ASME B16.5, B16.47

    • Pressure Classes: 150#, 300#, 600#, 900#, 1500#, 2500#

  • Size Range

    • Available from ½” to 48” (custom sizes available)

  • Oil & Gas Pipelines

  • Power Generation Plants

  • Chemical Processing Systems

  • High-Temperature & High-Pressure Equipment

  • Offshore and Marine Applications

Specification

Details

Size Range

½” to 48”

Pressure Rating

ANSI 150 – 2500 Class

Material Grades

CS, SS, Alloy, Duplex, Super Duplex

Standards

ASME B16.5, ASME B16.47

End Type

Butt Weld

Surface Finish

Serrated / Smooth / Custom

Q: Why choose a weld neck flange over a slip-on or blind flange?
A: Weld neck flanges provide excellent strength, stress distribution, and leak prevention, making them ideal for high-pressure and temperature applications.

Q: Do you offer material test certificates (MTC)?
A: Yes, all weld neck flanges come with MTCs and can be inspected by third-party agencies like TUV, SGS, or BV on request.

Q: Can these flanges be used for corrosive environments?
A: Yes. Select stainless steel or duplex options for enhanced corrosion resistance in harsh environments.