Long Neck Weld Flanges / Nozzle Flanges

Product Overview

Long Neck Weld Flanges / Nozzle Flanges Stockist & Supplier in India

Long Neck Weld Flanges, also known as Long Weld Neck Flanges or Nozzle Flanges, are specialized flanges designed with an extended hub or neck. They are commonly used where the flange also serves as a connection neck for pressure vessels, columns, reactors, storage equipment, and high-pressure piping systems.

As a reliable Long Neck Weld Flanges / Nozzle Flanges Stockist in India and Long Neck Weld Flanges / Nozzle Flanges Supplier in India, we supply these flanges in different materials, dimensions, pressure classes, and custom configurations.

With an established presence since 1985 and ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018 certifications, Metal-Link supports long neck weld flange and nozzle flange requirements with material traceability, inspection documentation and project-based supply.

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Datasheet

Long Neck Weld Flange / Nozzle Flange Specifications

Product Range

Types of Long Neck Weld Flanges / Nozzle Flanges

As an experienced Long Neck Weld Flanges / Nozzle Flanges Supplier in India, we supply a complete range of long weld neck and nozzle flange assemblies for pressure vessel connections, high-pressure piping, and process equipment applications.

Long Weld Neck Flange

Extended Hub for Structural Support

A Long Weld Neck Flange has a significantly longer hub than a standard weld neck flange. The extended neck provides a gradual transition between the flange and the connected pipe or vessel wall, helping distribute stresses more effectively.

These flanges are commonly used where the flange must extend beyond insulation, vessel walls, or other equipment structures.

Typical applications include:

• ✓High-pressure piping systems
• ✓Pressure vessel nozzles
• ✓Insulated pipeline connections
• ✓Process equipment with extended neck requirements

Nozzle Flange

Pressure Vessel and Equipment Connection

A Nozzle Flange is commonly integrated with pressure vessel nozzles, columns, reactors, heat exchangers, and other process equipment. The neck portion may be designed according to the vessel wall thickness and reinforcement requirements.

Nozzle flanges are often manufactured according to detailed engineering drawings because nozzle dimensions, neck length, wall thickness, and reinforcement requirements can vary significantly between projects.

Custom Long Neck Flange

Project-Specific Design

Custom long neck flanges are manufactured according to approved engineering drawings and project-specific requirements. Dimensions including flange outside diameter, bore, neck length, neck wall thickness, and bolt hole configuration may be designed to meet vessel or piping system requirements.

Forged Long Weld Neck Flange

High-Strength Pipeline and Equipment Connection

Forged long weld neck flanges are manufactured from forged material to achieve suitable mechanical strength and structural integrity. The material is selected according to the connected pipe or vessel and the operating pressure and temperature.

Common materials include:

• ✓Carbon Steel (ASTM A105)
• ✓Low-Temperature Carbon Steel (ASTM A350 LF2)
• ✓Alloy Steel (ASTM A182 F11/F22)
• ✓Stainless Steel (ASTM A182 F304/F316)
• ✓Duplex Steel
• ✓Nickel Alloy

Raised Face Long Neck Flange

Standard Industrial Sealing Surface

Raised face long neck flanges incorporate a raised sealing surface machined to concentrically serrated or smooth finish depending on the gasket type. This facing is the most commonly used for standard industrial piping and equipment connections.

Ring Type Joint Long Neck Flange

High-Pressure and High-Temperature Service

Ring Type Joint (RTJ) long neck flanges are designed with a precision-machined groove on the flange face to accommodate a metal ring gasket. This configuration provides a reliable seal for high-pressure and high-temperature service conditions commonly found in oil, gas, and petrochemical applications.

Material Grades

Common Materials for Long Neck Weld Flanges / Nozzle Flanges

Material selection depends on the design pressure, operating temperature, corrosion conditions, and compatibility with the connected pipe or pressure vessel.

Facing Options

Facing Types Available

Long Neck Weld Flanges / Nozzle Flanges can be supplied with different flange facings depending on the gasket and sealing system.

Design Data

Design Considerations for Nozzle Flanges

Nozzle flanges are often custom-engineered because they may form part of a pressure-containing vessel assembly. The neck and flange dimensions may need to accommodate pressure loading, external piping loads, thermal expansion, and vessel nozzle reinforcement requirements.

Important Design Parameters

Standards & Compliance

Standards and Specifications

Long Neck Weld Flanges / Nozzle Flanges may be supplied according to standard flange dimensions or manufactured to project-specific drawings.

For custom nozzle flanges, engineering drawings and pressure vessel design requirements may govern dimensions beyond standard ASME flange dimensions.

Industry Use

Applications of Long Neck Weld Flanges / Nozzle Flanges

Long Neck Weld Flanges and Nozzle Flanges are used in piping systems and process equipment where an extended neck connection, structural support, or custom vessel nozzle configuration is required.

• ✓Pressure Vessels:
  Nozzle connections on process vessels where extended neck and reinforced flange attachment are required.
• ✓Chemical Reactors:
  Inlet, outlet, and vent nozzle connections on chemical reactors operating at elevated pressure and temperature.
• ✓Distillation Columns:
  Column nozzle connections for feed, reflux, overhead, and bottom product piping.
• ✓Storage Tanks:
  Tank nozzle flanges for inlet, outlet, drain, and instrumentation connections.
• ✓Heat Exchangers:
  Shell and tube heat exchanger nozzle connections for process and utility streams.
• ✓Boilers:
  Steam drum and boiler nozzle connections operating under high pressure and temperature conditions.
• ✓Oil and Gas Processing Facilities:
  Separator, scrubber, and vessel nozzle connections in upstream and downstream processing systems.
• ✓Petroleum Refineries:
  Refinery vessel and column nozzle connections for crude, intermediate, and product streams.
• ✓Petrochemical Plants:
  Process vessel and reactor connections in ethylene, ammonia, methanol, and other petrochemical facilities.
• ✓Power Generation Systems:
  High-pressure steam piping and boiler connections in thermal and combined-cycle power plants.
• ✓High-Pressure Process Piping:
  Critical piping systems where extended neck flanges are required for stress distribution and structural integrity.

Certification

Testing, Inspection & Quality of Long Neck Weld Flanges / Nozzle Flanges

As a dependable Long Neck Weld Flanges / Nozzle Flanges Supplier in India, products can be supplied with inspection and testing according to applicable specifications and project requirements. Available testing may include:

• ✓Chemical composition analysis
• ✓Mechanical testing where applicable
• ✓Positive Material Identification (PMI)
• ✓Dimensional inspection
• ✓Visual examination
• ✓Liquid penetrant testing where required
• ✓Magnetic particle testing where applicable
• ✓Ultrasonic testing for forged materials
• ✓Radiographic testing where specified
• ✓Hardness testing
• ✓Hydrostatic testing where required

With an established presence since 1985 and ISO 9001:2015, ISO 14001:2015 and ISO 45001:2018 certifications, Metal-Link supports consistent product quality. Documentation may include Material Test Certificates, PMI reports, dimensional inspection reports, non-destructive testing reports, mechanical test results, and third-party inspection certificates.

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Pan-India Supply

Long Neck Weld Flange / Nozzle Flange Supplier & Stockist Across India

Metal-Link Steel & Alloys supplies Long Neck Weld Flanges and Nozzle Flanges to EPC contractors, engineering companies, pressure vessel fabricators, refineries, petrochemical plants, power plants, distributors and industrial buyers across major Indian markets. As a Long Neck Weld Flanges / Nozzle Flanges Supplier in India, Metal-Link supports standard and project-specific requirements based on type, size, material, pressure rating, facing type, neck dimensions, and quantity.

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Have Questions?

Frequently Asked Questions

What is a Long Weld Neck Flange?

A Long Weld Neck Flange has a significantly extended hub or neck compared to a standard weld neck flange. The longer neck provides a gradual stress transition between the flange body and the connected pipe or vessel wall. It is commonly used where the flange must extend beyond insulation, vessel walls, or structural members, and where the flange also serves as a nozzle connection for pressure vessels and process equipment.

What is the difference between a Long Weld Neck Flange and a Nozzle Flange?

A Long Weld Neck Flange refers to any flange with an extended hub and is commonly used in high-pressure piping systems. A Nozzle Flange specifically refers to a long weld neck flange designed to serve as a nozzle connection for pressure vessels, reactors, columns, or other process equipment. Nozzle flanges may be custom-engineered according to vessel design requirements and may not follow standard ASME B16.5 dimensions for the neck portion.

What materials are Long Neck Weld Flanges available in?

Long Neck Weld Flanges and Nozzle Flanges can be supplied in carbon steel (ASTM A105), low-temperature carbon steel (ASTM A350 LF2), alloy steel (ASTM A182 F11, F22), stainless steel (ASTM A182 F304, F316), duplex steel, and nickel alloys. Material selection depends on the operating pressure, temperature, corrosion environment, and compatibility with the connected piping or pressure vessel.

What standards apply to Long Neck Weld Flanges and Nozzle Flanges?

Standard Long Weld Neck Flanges are typically supplied per ASME B16.5 (up to 24 inch) or ASME B16.47 (large diameter). Nozzle flanges used in pressure vessel applications must also comply with ASME Section VIII for pressure vessel design and construction. Material requirements follow ASTM A105, A182, or A350 depending on the material grade selected. ASME B31.3 governs process piping design where these flanges are installed.

Can you supply custom Nozzle Flanges according to project drawings?

Yes. We supply custom fabricated nozzle flanges manufactured according to approved engineering drawings and project specifications. These can be designed for specific bore diameters, neck lengths, neck wall thicknesses, flange outside diameters, pressure ratings, material grades, and facing types. Material Test Certificates, PMI reports, dimensional inspection, and third-party inspection can be provided as required.

What facing types are available for Long Neck Weld Flanges?

Long Neck Weld Flanges and Nozzle Flanges can be supplied with Raised Face, Flat Face, Ring Type Joint (RTJ), Male and Female Face, and Tongue and Groove facing types. The facing is selected based on the gasket type, sealing requirements, operating pressure and temperature, and the mating flange connection.