Phone

+971 503096343

Address

BC 1304623, Ajman Freezone C1 Building, Ajman- United Arab Emirates

Weld Neck Flanges

Weld neck flanges are designed for butt welding to piping systems, ideal for high-stress applications due to their long neck, which distributes stress from the pipe to the flange. Their bore aligns with the pipe’s bore, minimizing turbulence and erosion.

These flanges, though costly due to their robust construction, provide critical reinforcement in demanding environments. They are widely used in industries like oil and gas, petrochemicals, and power generation for secure and reliable connections.

Weld Neck Flanges

Weld neck flanges are engineered for high-performance piping systems, featuring a long neck or hub that transfers stress from the weld to the flange base, reinforcing the connection. Butt welded to the pipe, they ensure a smooth bore alignment, reducing flow turbulence and erosion. Their design makes them suitable for extreme conditions, high pressure, and temperature fluctuations, ensuring long-term reliability in critical applications.

Key Properties of Weld Neck Flanges

  • Stress Distribution: Long neck transfers stress to the base, enhancing durability.
  • Flow Efficiency: Matching bore reduces turbulence and erosion.
  • High Strength: Ideal for high-pressure and high-temperature systems.
  • Reliable Connection: Butt welding ensures a secure, leak-proof joint.

Common Grades and Equivalents

Weld neck flanges are manufactured to meet stringent industry standards, ensuring compatibility and performance in various piping systems.

Grade/Standard Equivalent Application
ASTM A105, ANSI B16.5 Carbon steel Oil and gas, general piping
ASTM A182 F304/F316 Stainless steel Chemical processing, marine
ASTM A350 LF2 Low-temperature carbon steel Cryogenic pipelines

Applications of Weld Neck Flanges

Weld neck flanges are essential in industries requiring robust and reliable piping connections:

  • Oil and Gas: Used in high-pressure pipelines and refineries.
  • Power Generation: Supports steam and water systems in power plants.
  • Chemical Processing: Handles corrosive fluids in reactors and processing lines.
  • Petrochemicals: Ensures secure connections in processing facilities.

Specifications

Properties Values & Limits
Material Carbon Steel, Stainless Steel, Alloy Steel
Standards ASME B16.5, ANSI B16.47, MSS-SP-44
Connection Butt-Weld
Size Range 1/2" to 24" (Standard), up to 60" (Custom)
Pressure Rating 150#, 300#, 600#, 900#, 1500#, 2500#

Considerations for Use

  • Welding Precision: Proper butt welding techniques are critical to ensure joint integrity.
  • Material Selection: Choose materials compatible with pipe and fluid to prevent corrosion.
  • Cost Factor: Higher cost due to long neck; justify with high-stress application needs.