Long Weld Neck Flanges

Long Weld Neck Flanges - Collection Overview

A long weld neck flange is a one-piece component with an extended neck that is welded directly to the pipe. The long hub provides a smooth transition from flange to pipe bore and helps distribute pressure across the weld. This makes the flange a common choice where strength, steady flow, and stable welded connections are priorities.

Design and Operational Benefits

The extended neck reduces stress concentration at the weld and supports better alignment with the pipe bore. These flanges work well where steady flow and minimised turbulence are important in process lines. A raised face long weld neck flange option is included for applications where a defined gasket seating area is required to achieve consistent gasket compression and sealing.

Long weld neck flanges are often specified for connections to vessels, pumps, heat exchangers, and equipment nozzles. The continuous neck and flange body help maintain weld integrity in systems with elevated pressure or temperature loads. For complex piping projects, these flanges can be paired with buttweld fittings to ensure smooth transitions and secure welded joints.

Common Industrial Applications

Typical uses include:

• High-pressure steam and thermal fluid lines
• Oil and gas process piping and headers
• Chemical and petrochemical process units
• Pressure vessels, columns, and equipment nozzles
• Fabrication projects where an extended hub improves fit and reinforcement

These flanges support piping layouts that need a fixed, long-term connection and where frequent disassembly is not expected.

Materials, Sizes, and Ratings

This collection covers standard sizes and pressure classes used in U.S. process industries. Material grades commonly include carbon steel and stainless steel industrial alloys. Product pages list dimensions, pressure class, and material details so buyers can confirm compatibility with their pipe schedule and equipment requirements.

When a raised face long weld neck flange is specified, the product listing includes the raised face height and sealing surface details to help match gasket type and clamp load needs.

Buy Long Weld Neck Flanges from Trupply

This collection features long weld neck flanges suited for new installations, turnaround work, and industrial fabrication needs. Each item includes key details such as material grade, size, and pressure class to help customers review what fits their piping setup.

Industrial buyers can browse the available long weld neck flange options and select components that align with their project needs for strong, reliable welded connections used throughout U.S. process and mechanical industries.

Sizes

Size & Dimension table for Flanges

Materials

A105 - The standard forged carbon steel piping components for ambient and high temperature / pressure systems

SS304 - A common standard for stainless steel due to its malleability, high corrosive resistance weld-ability  

SS316 - A molybdenum stainless steel that provides excellent tensile, creep and stress-rupture strengths at elevated temperatures

Material Description for Flanges

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