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Long Neck Flanges

Long neck flanges, also known as long weld neck flanges, are designed for butt welding to piping systems, featuring an extended neck for enhanced strength and stress distribution. They provide simple connectivity and robust performance in demanding applications.

These flanges are extensively used in refining industries and other high-pressure systems, offering reliable connections at competitive prices, sourced from trusted vendors for quality assurance.

Long Neck Flanges

Long neck flanges are engineered for high-performance piping systems, featuring an elongated neck that distributes stress from the pipe to the flange, ensuring durability under high-pressure and high-temperature conditions. Butt welded to the pipe, they align the bore for smooth flow, reducing turbulence and erosion. Their robust design and simple connectivity make them a preferred choice in refining, petrochemical, and other critical industries, providing secure and leak-proof joints.

Key Properties of Long Neck Flanges

  • Extended Neck: Enhances stress distribution for high-pressure systems.
  • Flow Efficiency: Bore alignment minimizes turbulence and erosion.
  • High Strength: Suitable for demanding, high-temperature applications.
  • Simple Connectivity: Butt welding ensures a secure, reliable joint.

Common Grades and Equivalents

Long neck flanges are manufactured to meet stringent industry standards, ensuring compatibility and performance in critical applications.

Grade/Standard Equivalent Application
ASTM A105, C21/C22.8, EN10222-2 Carbon Steel Oil and gas, refining
ASTM A182 F304(L/H), UNS S30400, WSt. 1.4301, EN10222-5 Stainless Steel Chemical processing, marine
ASTM A182 F316(L/H/Ti), UNS S31600, WSt. 1.4401, EN10222-5 Stainless Steel Petrochemical, high-temperature systems

Applications of Long Neck Flanges

Long neck flanges are critical in industries requiring robust and reliable piping connections:

  • Oil and Gas: Used in high-pressure refining and pipeline systems.
  • Petrochemicals: Supports high-temperature processing lines.
  • Power Generation: Connects steam and water systems in power plants.
  • Chemical Processing: Handles corrosive fluids in reactors.

Specifications

Material: Standard: Connection: Size Range: Pressure Rating:
Carbon Steel, Stainless Steel ASME B16.5, ANSI B16.47, EN10222-2, EN10222-5 Butt-Weld 1/2" to 24" (Standard), up to 60" (Custom) 150#, 300#, 600#, 900#, 1500#, 2500#

Considerations for Use

  • Welding Precision: Proper butt welding is essential to joint integrity.
  • Material Compatibility: Select materials to match the pipe and fluid to prevent corrosion.
  • Cost Consideration: Higher cost due to extended neck; justify with application demands.