Socket Weld Flanges

Pipe misalignment, welding fatigue, or sealing failures can delay line commissioning in compact piping layouts. Our Socket Weld Flanges (SW Flange) avoids such issues by allowing fast alignment and easy welding with reduced weld volume.

Standard Specification

ASME B16.5, ASME B16.11, MSS SP-44, EN 1092-1, DIN 2633

Pressure Rating

Class 3000, 6000 (PN40 to PN100) [Limited to smaller sizes due to socket weld design]

Material

Class 3000, 6000 (PN40 to PN100) [Limited to smaller sizes due to socket weld design]

Nominal Size

½” to 4″ (DN15 to DN100) [Max 2″ for high-pressure applications]

Flange Type

Socket Weld (SW) – Pipe inserts into flange socket and is fillet-weld secured

Product Description

Small pipe sizes often create challenges during flange placement and sealing. This design simplifies installation while keeping pipe bore continuity and holding pressure at Class 3000 or 6000 ratings.

Facing Type

Raised Face (RF), Flat Face (FF)

Dimensions

Customizable (Socket Depth, Bore Size) [Per ASME B16.11]

Bolt Circle Diameter

ASME B16.5: Standardized per class/size; EN 1092-1: Metric series

Number & Size of Bolt Holes

4 to 8 holes (½” to ¾” bolts) [Limited due to small size range]

Surface Finish

Smooth machined (125–250 RA), Electro-polished (for sanitary applications)

Corrosion Resistance

SS316/L: High resistance; Carbon Steel: Galvanized/Epoxy-coated

Temperature Rating

-29°C to +400°C [Lower than WN flanges due to stress concentration at weld]

Material Certification

MTR, EN 10204 3.1, NACE MR0175 (for sour service)

Gasket Compatibility

Flat ring gaskets (non-metallic), Spiral-wound (limited to Class 3000)

Coating/Plating

Electroless Nickel, Xylan, PTFE (for chemical resistance)

Manufacturing Method

Forged (ASTM A105/A182), Precision machined (for tight tolerances)

Technical Advantages

Socket welds reduce welding time while giving stronger joint stability than slip-on types. We follow ASME B16.11 for socket depth, weld gap, and bore tolerance to avoid flow restriction.
Raised face and flat face options help match varied gasket standards in chemical and gas units. All machined surfaces maintain 125–250 RA finish, and electropolished SS options suit sanitary needs.

Let's Get Started

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

Industry Applications

Chemical Injection Skids

Fits small-bore lines where leak-free seals and quick welding are needed in confined spaces.

Compact Heat Exchangers

Helps connect low-flow circuits where full-penetration welding is not feasible.

Offshore Module Packages

Suitable for high-pressure systems with strict space and weight constraints.

Process Gas Panels

Works in instrument tap-offs requiring exact bore matching and Class 6000 rating.

OEM Pressure Systems

Used in compact builds that demand clean welds and easy repeat assembly in low-clearance zones.

Custom-Fit SW Flanges for Small Pipe Systems

Every high-pressure small-bore system needs flanges that avoid over-welding and seal under thermal cycling. We manufacture SW flanges from forged ASTM A105, A182, or A694 stock with class ratings up to 6000.
Clients can request electroplated or Xylan-coated finishes for corrosion zones or sour service. Socket depth, bore, and bolt circle are customizable based on your pipe and flange configuration.

Having Doubts? Our FAQ

Check all our Frequently Asked Question

Why are socket weld flanges limited to small pipe sizes?

Socket weld flanges rely on internal sockets for pipe insertion, which becomes unreliable beyond 4-inch diameter. Larger sizes increase weld stress and risk of incomplete fusion. For pipes above this range, weld neck or slip-on flanges are preferred.

Can I use socket weld flanges in sour service pipelines?

Yes, but only when using certified materials like ASTM A182 F316 or A694 F52 with NACE MR0175 compliance. We also offer Xylan or PTFE coatings to improve chemical resistance. Always verify material traceability with MTR and EN 10204 3.1 certification before final selection.

Are spiral-wound gaskets suitable for socket weld flanges?

Spiral-wound gaskets can be used but only in Class 3000 applications with raised face ends. Socket weld design offers limited gasket surface area compared to weld neck types. Non-metallic flat gaskets are often the safer and more reliable choice.

Do socket weld flanges require precise pipe end preparation?

Yes, the pipe must have a square-cut end with deburred edges for correct socket insertion. An expansion gap must also be maintained during welding to prevent thermal cracking. We follow ASME B16.11 weld gap rules to avoid distortion.

How do I confirm the flange fits my bolt pattern and bore size?

We follow ASME B16.5 and EN 1092-1 bolt circle rules by flange class and size. Bore and socket dimensions follow ASME B16.11 and can be customized if requested. We recommend sharing your piping isometric or layout file for accurate fitment.

Can Frigate supply socket weld flanges with project-specific dimensions and tolerances?

Yes, Frigate manufactures fully customized SW flanges based on your piping drawings or isometrics

Socket depth, bore size, and weld gap are machined exactly per ASME B16.11 or project specs

Tight tolerances ensure perfect alignment and eliminate site rework

Ideal for skid-mounted systems and OEM assemblies requiring repeatability

What quality checks does Frigate perform before dispatch?

100% dimensional inspection for socket, bore, and bolt circle accuracy

PMI (Positive Material Identification) for alloy and stainless grades

Surface finish validation (125–250 RA or electropolished as required)

Documentation includes MTR and EN 10204 3.1 certification

Optional third-party inspection (TPI) available on request

Can Frigate support bulk orders for OEM or EPC projects?

Yes, we handle both small batches and high-volume production runs

Consistent forging and machining processes ensure uniform quality across lots

Batch traceability maintained for all supplied flanges

Flexible production planning supports tight project timelines

Does Frigate provide coated or corrosion-resistant SW flanges for harsh environments?

Available coatings include Xylan, PTFE, and electroless nickel

Suitable for chemical exposure, offshore, and sour service applications

SS316/L and alloy grades offered for enhanced corrosion resistance

Coating thickness and type can be tailored to project conditions

How quickly can Frigate deliver custom socket weld flanges?

Standard sizes available with short lead times for urgent requirements

Custom-engineered flanges manufactured within agreed project schedules

Dedicated production planning ensures on-time delivery for EPC deadlines

Expedited manufacturing options available for critical shutdowns

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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

Other Locations

GENERAL ENQUIRIES

LOCATIONS

Registered Office

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

Components Built for Critical Performance

Engineered Products for Critical Applications

Socket Weld Flanges

Standard Specification

Pressure Rating

Material

Nominal Size

Flange Type

Product Description

Facing Type

Dimensions

Bolt Circle Diameter

Number & Size of Bolt Holes

Surface Finish

Corrosion Resistance

Temperature Rating

Material Certification

Gasket Compatibility

Coating/Plating

Manufacturing Method

Technical Advantages

Let's Get Started

Industry Applications

Custom-Fit SW Flanges for Small Pipe Systems

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Plate Flanges

Having Doubts? Our FAQ

Get Clarity with Our Manufacturing Insights

We'd love to Manufacture for you!

LOCATIONS

Registered Office

Operations Office

Other Locations

GENERAL ENQUIRIES

LOCATIONS

Registered Office

Other Locations

GENERAL ENQUIRIES

Get Your Quote Now

Socket Weld Flanges

Get Latest Price

Socket Weld Flanges

Get Latest Price