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.
Get Factory Rates →| Specification | Details |
|---|---|
| Product | Long Neck Weld Flanges / Nozzle Flanges (Long Weld Neck Flanges) |
| Types Available | Standard Long Weld Neck Flange, Nozzle Weld Neck Flange, Custom Long Neck Flange, Forged Long Weld Neck Flange, Raised Face Long Neck Flange, Ring Type Joint Long Neck Flange |
| Material Grades | Carbon Steel (ASTM A105, A350 LF2), Alloy Steel (ASTM A182 F11/F22), Stainless Steel (ASTM A182 F304/F316), Duplex Steel, Nickel Alloy |
| Standards | ASME B16.5, ASME B16.47, ASME Section VIII, ASME B31.3, ASTM A105, ASTM A182, ASTM A350 |
| Size Range | 1/2" to 60" and above (subject to type and material) |
| Pressure Rating | Class 150, 300, 600, 900, 1500, 2500 and custom pressure ratings |
| Facing Types | Raised Face, Flat Face, Ring Type Joint, Male and Female Face, Tongue and Groove |
| Design Feature | Extended hub or neck providing gradual stress transition between flange and connected pipe or vessel wall |
| Application | Pressure vessels, reactors, columns, heat exchangers, high-pressure piping, petrochemical and power plants |
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.
| Type of Flange | Design Feature | Typical Application |
|---|---|---|
| Standard Long Weld Neck Flange | Extended neck with flange connection | High-pressure piping |
| Nozzle Weld Neck Flange | Extended neck designed for vessel connection | Pressure vessels and reactors |
| Custom Long Neck Flange | Dimensions manufactured to drawings | Special process equipment |
| Forged Long Weld Neck Flange | Manufactured from forged material | High-strength applications |
| Raised Face Long Neck Flange | Raised sealing surface | Standard industrial bolting |
| Ring Type Joint Long Neck Flange | RTJ groove for metal ring gasket | High-pressure and high-temperature service |
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:
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 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 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:
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 (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 | Typical Service Application |
|---|---|
| Carbon Steel ASTM A105 | General pressure piping and equipment |
| ASTM A350 LF2 | Low-temperature service |
| Alloy Steel ASTM A182 F11/F22 | Elevated-temperature and high-pressure service |
| Stainless Steel ASTM A182 F304/F316 | Corrosive process environments |
| Duplex Steel | Offshore and chloride-containing service |
| Nickel Alloy | Severe corrosion and high-temperature applications |
Material selection depends on the design pressure, operating temperature, corrosion conditions, and compatibility with the connected pipe or pressure vessel.
Long Neck Weld Flanges / Nozzle Flanges can be supplied with different flange facings depending on the gasket and sealing system.
| Facing Type | Typical Use |
|---|---|
| Raised Face | General industrial piping |
| Flat Face | Lower-pressure flange connections |
| Ring Type Joint | High-pressure and high-temperature systems |
| Male and Female Face | Controlled gasket positioning |
| Tongue and Groove | Specialized sealing applications |
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.
Long Neck Weld Flanges / Nozzle Flanges may be supplied according to standard flange dimensions or manufactured to project-specific drawings.
| Standard | Application |
|---|---|
| ASME B16.5 | Pipe flanges and flanged fittings |
| ASME B16.47 | Large diameter steel flanges |
| ASME Section VIII | Pressure vessel design and construction |
| ASME B31.3 | Process piping |
| ASTM A105 | Carbon steel forged flanges |
| ASTM A182 | Alloy and stainless steel forged flanges |
| ASTM A350 | Low-temperature carbon and alloy steel forgings |
For custom nozzle flanges, engineering drawings and pressure vessel design requirements may govern dimensions beyond standard ASME flange dimensions.
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.
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:
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.
View Certificate →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.
Looking for a Long Neck Weld Flanges / Nozzle Flanges Stockist in India for your pressure vessel, refinery, petrochemical, power generation, or industrial piping requirements? Contact Metal-Link Steel & Alloys with your flange size, pressure class, material grade, neck length, neck thickness, bore size, facing type, applicable standard, design pressure, design temperature, quantity, and inspection or documentation requirements for availability and project-specific pricing.
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