Socket Weld Flanges – Types, Uses, Classes & Selection Guide

Socket Weld Flanges are compact flange connections designed primarily for smaller-diameter piping systems. The pipe is inserted into a recessed socket in the flange and joined by welding according to the applicable fabrication procedure.

Because of their practical construction, Socket Weld Flanges are commonly considered for process piping, instrumentation lines, utility systems and other applications where the applicable design specification permits their use.

Vandan Alloys manufactures and supplies Socket Weld Flanges in carbon steel, stainless steel, alloy steel, duplex, super duplex and nickel alloy materials for domestic and international requirements.

What is a Socket Weld Flange?

A Socket Weld Flange (SW Flange) has a socket or recessed bore into which the pipe is inserted.

Unlike a Slip-On Flange, where the pipe passes through the flange, the pipe in a Socket Weld Flange is positioned inside the flange socket and welded.

The socket configuration provides a defined pipe seating arrangement and is commonly used for smaller nominal pipe sizes.

How Does a Socket Weld Flange Work?

The pipe is inserted into the socket of the flange.

The components are properly aligned and the connection is welded according to the applicable welding procedure and project specification.

Correct fit-up, welding practice and inspection are important for obtaining a reliable connection.

The exact weld configuration and dimensional requirements should always follow the applicable standard and engineering specification.

Types of Socket Weld Flanges

Socket Weld Flanges can be supplied with different face configurations depending on the applicable standard and application.

Raised Face Socket Weld Flange – RF

RF Socket Weld Flanges have a raised gasket seating surface and are commonly used for general industrial piping connections.

Flat Face Socket Weld Flange – FF

FF Socket Weld Flanges have a flat gasket seating surface and may be selected where a flat-face connection is specified.

RTJ Socket Weld Flange

Where permitted by the applicable standard, RTJ Socket Weld Flanges can be supplied for ring-type joint applications.

RTJ groove dimensions must correspond to the applicable standard and mating flange.

Socket Weld Flange Construction

A typical Socket Weld Flange includes:

• Flange body

• Socket bore

• Pipe seating area

• Bolt holes

• Bolt circle / PCD

• Gasket seating face

• Outside diameter

• Flange thickness

Dimensions depend on the selected standard, nominal size, pressure class and material.

Socket Weld Flange Pressure Classes

Common ASME pressure classes include:

• Class 150

• Class 300

• Class 400

• Class 600

• Class 900

• Class 1500

• Class 2500

The available class depends on the applicable standard, size and configuration.

For European requirements, customers may specify PN-rated flanges such as:

• PN10

• PN16

• PN25

• PN40

• PN63

• PN100

• PN160

The exact type, size and pressure rating should be confirmed against the governing standard.

Socket Weld Flange Size Range

Socket Weld Flanges are particularly associated with smaller nominal pipe sizes.

Common requirements may include:

• 1/2"

• 3/4"

• 1"

• 1-1/4"

• 1-1/2"

• 2"

• 2-1/2"

• 3"

• 4"

Availability and dimensional limits depend on the applicable standard and pressure class.

For sizes outside standard configurations, a customer drawing or project specification can be reviewed.

Socket Weld Bore & Pipe Fit

The socket must be suitable for the intended pipe dimensions.

Customers should provide the required:

NPS / DN

Pipe OD

Pipe wall thickness / schedule

Flange standard

Pressure class

This information helps ensure the correct socket dimensions and connection configuration.

Common pipe schedules may include SCH 10, SCH 40, SCH 80, SCH 100, SCH 120 and XXS, subject to the applicable pipe size and specification.

Socket Weld Flange Materials

Vandan Alloys supplies Socket Weld Flanges in various material groups.

Carbon Steel

Typical grades include:

• ASTM A105

• ASTM A105N

Stainless Steel

Common grades include:

• ASTM A182 F304

• ASTM A182 F304L

• ASTM A182 F316

• ASTM A182 F316L

• F321

• F347

• F310

• F904L

Duplex & Super Duplex

• Duplex 2205

• UNS S31803

• UNS S32205

• Super Duplex 2507

• UNS S32750

• UNS S32760

Nickel & Special Alloys

Socket Weld Flanges can also be supplied in selected nickel and high-performance alloys, including:

• Monel

• Inconel

• Incoloy

• Hastelloy

• Titanium and other special materials, subject to requirement

A105N Socket Weld Flanges

ASTM A105N Socket Weld Flanges are normalized carbon steel forged flanges supplied to the applicable material and dimensional requirements.

A105N should be clearly specified when the normalized condition is required.

A typical enquiry can state:

ASTM A105N + Socket Weld Flange + NPS + Class + Facing + Quantity

Material certification and inspection requirements should be specified with the purchase order.

Stainless Steel Socket Weld Flanges

Stainless Steel Socket Weld Flanges are used where corrosion resistance and material compatibility are important.

Popular grades include:

304 / 304L

316 / 316L

321

347

310 / 310S

904L

Grade selection depends on the process medium, temperature, corrosion environment and engineering specification.

Duplex Socket Weld Flanges

Duplex 2205 Socket Weld Flanges can be selected for applications requiring a combination of corrosion resistance and mechanical performance.

Common designations include:

UNS S31803

UNS S32205

For higher corrosion resistance requirements, Super Duplex 2507 grades such as UNS S32750 / S32760 may be specified where suitable.

Socket Weld Flange Standards

Depending on the requirement, Socket Weld Flanges can be manufactured or supplied according to:

• ASME B16.5

• EN 1092-1

• DIN

• JIS

• BS

• Customer drawings

• Project-specific specifications

The applicable standard should always be confirmed before manufacturing.

Socket Weld Flange Applications

Socket Weld Flanges are commonly considered for:

• Process piping

• Chemical plants

• Petrochemical systems

• Oil & Gas applications

• Power plants

• Instrumentation piping

• Hydraulic systems

• Utility piping

• Compressed air systems

• Industrial fabrication

• Maintenance and replacement work

Their use should be based on the piping design and applicable engineering requirements.

Socket Weld Flange Advantages

Compact Connection

The Socket Weld configuration can be suitable for compact piping arrangements, particularly in smaller sizes.

Defined Pipe Position

The internal socket provides a seating location for the pipe during fit-up.

Suitable for Small-Diameter Piping

Socket Weld Flanges are commonly selected for smaller nominal pipe sizes where their use is permitted by the applicable specification.

Multiple Material Options

They can be supplied in carbon steel, stainless steel, duplex, super duplex and selected alloy materials.

Socket Weld Flange vs Slip-On Flange

Socket Weld Flange:
The pipe enters a recessed socket in the flange and is welded.

Slip-On Flange:
The pipe passes through the flange bore and is attached by welding.

Socket Weld Flanges are generally associated with smaller piping, while Slip-On Flanges are available across a broader range of common piping sizes.

The final selection should be based on the engineering design and applicable standard.

Socket Weld Flange vs Weld Neck Flange

Socket Weld Flange uses a socket connection with the pipe.

Weld Neck Flange uses a tapered hub and butt-weld connection.

For demanding piping systems, the selection between these designs should consider pressure, temperature, fatigue, thermal cycling, piping loads and the applicable engineering specification.

Socket Weld Flange Facing

Available facing configurations depend on the applicable standard and size.

Common requirements include:

RF – Raised Face

FF – Flat Face

RTJ – Ring Type Joint, where applicable

The selected face should match the mating flange and gasket system.

Socket Weld Flange Inspection

Inspection requirements can include:

• Visual inspection

• Dimensional inspection

• Socket bore inspection

• Face inspection

• Bolt-hole inspection

• Material identification

• Chemical composition verification

• Mechanical testing

• Heat treatment verification where applicable

• Marking and traceability

• Third-party inspection

Inspection requirements should be agreed before production.

MTC & Documentation

For applicable orders, EN 10204 Type 3.1 Material Test Certificate can be supplied.

Documentation may include:

• Heat number

• Chemical composition

• Mechanical properties

• Material grade

• Heat treatment information where applicable

• Dimensional information

• Inspection records

Additional documentation can be discussed according to the purchase specification.

Custom Socket Weld Flanges

Vandan Alloys can evaluate special Socket Weld Flange requirements based on customer drawings or technical specifications.

Custom requirements may include:

• Special dimensions

• Special socket bore

• Customized PCD

• Special bolt-hole arrangement

• Special thickness

• Special facing

• Special material grade

• Non-standard configurations

Customers can provide a PDF, CAD drawing, dimensional sketch or project specification for review.

How to Order Socket Weld Flanges

For a quotation, provide:

Size / NPS:
Pressure Class / PN:
Material Grade:
Flange Type: Socket Weld
Facing: RF / FF / RTJ
Pipe OD / Schedule:
Standard:
Quantity:
Inspection Requirement:
Delivery Location:

For non-standard requirements, provide the drawing along with the enquiry.

Vandan Alloys – Socket Weld Flange Manufacturer & Exporter

Vandan Alloys manufactures and supplies Socket Weld Flanges for industrial piping, process plants, engineering projects, maintenance requirements and international export.

Our supply range includes:

• Carbon Steel Socket Weld Flanges

• A105N Socket Weld Flanges

• Stainless Steel Socket Weld Flanges

• Duplex Socket Weld Flanges

• Super Duplex Socket Weld Flanges

• Alloy Steel Socket Weld Flanges

• Nickel Alloy Socket Weld Flanges

• Custom Socket Weld Flanges

We support requirements for different sizes, pressure classes, standards, materials and facing configurations, subject to the applicable specification.

If you are looking for a Socket Weld Flange Manufacturer in India, A105N Socket Weld Flange Supplier, Stainless Steel Socket Weld Flange Manufacturer, ASME Socket Weld Flange Supplier or Custom Socket Weld Flange Exporter, send your complete requirement to Vandan Alloys.

Send your Socket Weld Flange enquiry, drawing or specification for quotation.

Vandan Alloys 

Manufacturer of All Types of Flanges

3/5, Sakar Bhavan, Ground Floor, 6th  Khetwadi lane, SVP Road ,Mumbai – 400 004. India

TEL+91 022 6610 9925Mobile no: 09892882255  GSTIN:  27AUMPS2067F1ZB

Email: info@vandanalloys.com ; Web: www.vandanalloys.com

Please visit Our Flanges Division:www.vandanalloys.net

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Vandan Alloys manufactures and exports Socket Weld Flanges in A105, A105N, stainless steel, duplex and nickel alloys. ASME, EN and custom SW Flanges in various classes.

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