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Expander Flanges

Struggling with smooth and efficient pipe transitions for systems requiring different pipe diameters can lead to weak joints and unreliable connections. Our Expander Flanges (Weld Neck Type) address these challenges, offering seamless connections with high durability across varying pressures and sizes.  

Standard Specification

ASME B16.5 (Custom), MSS SP-44, API 6A (Special Applications)

Pressure Rating

Class 150 to 2500 (PN10 to PN420) [Based on outlet flange size]

Material

Carbon Steel (A105), Stainless Steel (A182 F316L), Alloy Steel (A694 F65)

Nominal Size

Inlet: ½” to 12″ (DN15 to DN300) Outlet: Up to 24″ (DN600) [Max 4:1 expansion ratio]

Flange Type

Weld Neck Expander (Integral reducer + flange)
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Product Description

With a smooth taper from a smaller pipe to a larger one, they ensure strong and secure pipeline joints, minimizing risks of failure. Manufactured to meet custom standards, these flanges deliver the performance your operations demand, even in high-stress environments. 

Facing Type

Raised Face (RF) or Ring-Type Joint (RTJ) [Outlet side only]

Dimensions

Length = 1.5×Outlet Size [Min. taper angle 15° per ASME B16.9]

Bolt Circle Diameter

Matches outlet flange size [ASME B16.5 Table 4]

Number & Size of Bolt Holes

Matches outlet flange [No hole drilling on inlet side]

Surface Finish

125-250 μin RA (RF), 63-125 μin RA (RTJ) [Bore polished to 32μin Ra]

Corrosion Resistance

Clad construction available (CS body with SS/Alloy 625 liner)

Temperature Rating

-29°C to +538°C [Limited by base material]

Material Certification

EN 10204 3.2, NACE MR0175 (for sour service), PED 2014/68/EU

Gasket Compatibility

Matches outlet flange [Full-face gaskets required]

Coating/Plating

Internal FBE coating, Xylan lining (for slurry service)

Manufacturing Method

Forged (A105/A182) + CNC machining [Integral one-piece construction]

Technical Advantages

Expander flanges are critical where different pipe diameters need to be joined with minimal disturbance to flow. By using an integral design, they eliminate the need for additional adapters, offering a smooth flow path with reduced turbulence.  

The consistent pressure rating and high-temperature resistance ensure these flanges perform reliably across a range of conditions, from -29°C to +538°C. Moreover, the seamless construction minimizes the risk of failure or leakage, even in corrosive environments. 

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Industry Applications

Oil and Gas Pipelines

Expander flanges provide reliable, long-lasting connections for high-pressure oil and gas pipelines, handling variable flow rates and ensuring safe transitions.

Chemical Processing

These flanges seamlessly accommodate piping system changes, helping prevent leaks in chemical processing plants and ensuring smooth transitions for fluid and gas flow.

Power Generation Plants

In thermal and nuclear plants, expander flanges ensure reliable high-pressure connections between pipes of different sizes, optimizing heat exchange systems.

Refineries

Expander flanges are ideal for refinery systems, where fluid dynamics and pipe transitions require both strength and flexibility for long-term performance. 

Water Treatment Facilities

Used for water distribution networks, they manage pressure transitions and help maintain the structural integrity of the piping system.

Mining Operations

Expander flanges ensure smooth and safe transitions for slurry pipes, reducing the risk of corrosion and wear in mining and processing operations. 

Expander Flanges

Cost-Effective Solution with High Durability

Reducing the cost of maintenance and downtime is crucial in manufacturing, where each delay can lead to significant losses. Our Expander Flanges (Weld Neck Type) feature a robust, one-piece construction that not only offers high-strength performance but also reduces the need for additional fittings and maintenance.  

Whether you are managing pressure systems in industrial plants or ensuring safe water delivery, these flanges provide the reliability and durability required, ultimately lowering long-term operational costs. 

Expander Flanges

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Having Doubts? Our FAQ

Check all our Frequently Asked Question

What pressure ratings can the Expander Flange handle?

The Expander Flange is available in pressure ratings from Class 150 to Class 2500 (PN10 to PN420), depending on the outlet flanges size. This wide range ensures compatibility with various pipeline systems across industries. It offers the flexibility to meet both low and high-pressure demands.

Can the Expander Flange be used in corrosive environments?

Yes, our Expander Flanges are designed to withstand harsh environments. We offer a clad construction, combining a carbon steel body with stainless steel or Alloy 625 liners, which significantly improves corrosion resistance. This makes them suitable for chemical processing, oil, and gas applications.

How do I ensure the right flange size for my system?

The nominal size of the inlet ranges from ½” to 12″ (DN15 to DN300), while the outlet can be up to 24″ (DN600), with a maximum 4:1 expansion ratio. To determine the correct size, match the outlet flange size to the dimensions of your piping system. Our team can assist in selecting the right configuration based on your requirements.

What type of surface finish is available for these flanges?

Our Expander Flanges come with surface finishes of 125-250 μin RA for Raised Face (RF) and 63-125 μin RA for Ring-Type Joint (RTJ) on the outlet side. The bore is polished to 32 μin Ra, ensuring smooth operation and sealing performance. These finishes meet industry standards for both aesthetic and functional purposes.

Are the Expander Flanges customizable for specific applications?

Yes, our Expander Flanges can be customized to meet specific application needs, such as different material grades or coating options. We offer flexibility in material selection, including Carbon Steel, Stainless Steel, and Alloy Steel. Additionally, we provide internal coatings like FBE for corrosion protection and Xylan for slurry service, ensuring the flange suits your unique operational requirements. 

What is Frigate’s typical lead time for Expander Flanges (Weld Neck Type)?
  • Standard production lead time: 2–4 weeks, depending on size and material 
  • Expedited manufacturing available for urgent project requirements 
  • Lead time may vary for clad or special alloy configurations 
  • Dedicated project coordination ensures on-time delivery commitments 
  • Bulk orders can be scheduled with phased dispatch planning 
Does Frigate provide inspection and testing before dispatch?
  • 100% dimensional inspection and visual checks before shipment 
  • NDT testing available (UT, PMI, RT) based on project requirements 
  • Hydro testing can be conducted upon request 
  • Third-party inspection support (BV, TUV, SGS, etc.) available 
  • Full documentation package including MTC (EN 10204 3.2) provided 
Can Frigate support bulk or project-based orders?
  • Specialized in bulk manufacturing for EPC and industrial projects 
  • Capacity to handle high-volume, repeat production orders 
  • Project-based pricing ensures cost efficiency at scale 
  • Dedicated account management for long-term supply contracts 
  • Flexible logistics support for global project deliveries 
What customization support does Frigate offer for expander flanges?
  • Custom sizes, pressure classes, and non-standard dimensions supported 
  • Wide material range including duplex, super duplex, and nickel alloys 
  • Special coatings/linings tailored for corrosive or slurry environments 
  • Design assistance for application-specific performance optimization 
  • Ability to manufacture as per client drawings or project specifications 
How does Frigate ensure consistency across multiple orders?
  • Strict adherence to standardized manufacturing procedures 
  • CNC-controlled production for repeatable dimensional accuracy 
  • Batch traceability maintained for every manufactured flange 
  • Documented quality checks aligned with global industry standards 
  • Proven track record in delivering consistent quality across projects 
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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

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LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Other Locations

  • Bangalore
  • Chennai
  • Coimbatore
  • Germany
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Become a Supplier

GENERAL ENQUIRIES

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Expander Flanges

Need reliable wires and cables for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

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Expander Flanges

Need reliable Machining for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Get Latest Price

Get Price Form