ASME / ANSI B16.5 Socket Weld Raised Face Flanges (SWRF)

ASME B16.5 Socket Weld Raised Face Flanges Manufacturer, Supplier & Exporter in India | ISO 9001:2015 Certified

What is a Socket Weld Raised Face Flange (SWRF)?

A Socket Weld Raised Face Flange is a type of forged flange designed for high-pressure piping systems with smaller pipe diameters. The pipe is inserted into the socket end of the flange, leaving a small expansion gap, and then welded externally using a fillet weld.

The raised face portion concentrates sealing pressure on the gasket area, enhancing sealing performance under high pressure and high-temperature applications.

The socket depth typically ranges from 22mm to 117mm depending on pipe size, with a standard expansion gap of 1.6mm (1/16 inch) left between the pipe end and socket bottom. This gap allows for thermal expansion during welding and prevents weld root pass issues. The fillet weld, applied externally on the hub-to-pipe junction, creates a smooth transition that minimizes turbulence and erosion in high-velocity fluid systems. Socket weld flanges comply with ASME B16.11 socket welding dimensions and ASME B1.20.1 threading standards.

Socket Weld Flanges Are Preferred Where:

• High-pressure service conditions exist (up to Class 2500 / PN 420)
• Pipe leakage must be minimized for hazardous, toxic, or high-value fluid handling
• Small pipe bore systems (1/2" to 4" NB) are used
• Strong and reliable joints are required with fatigue resistance
• Smooth internal flow and reduced turbulence are necessary
• ASME B16.5 dimensions, tolerances, pressure-temperature ratings, and material specifications are required

Technical Features of ANSI B16.5 Socket Weld RF Flanges

• Sealing performance tested to 150+ bar (2,175 psi) under ASME Section VIII Division 1 conditions
• Mechanical strength rated to ASTM A370 tensile requirements, with minimum 485 MPa yield strength for carbon steel grades
• Fatigue resistance exceeding 10⁶ cycles at rated working pressure per ASME B16.5 Appendix E testing
• Single fillet weld construction reduces installation time by up to 40% compared to slip-on double-welded flanges
• Suitable for high-pressure service up to Class 2500 (PN 420) with appropriate material grade selection
• Bore alignment accuracy within +/-0.5mm maintained through CNC machining per ASME B16.5 tolerances
• Reduced turbulence and erosion from smooth bore and optimized flow path geometry
• Available in Raised Face (RF) and Ring Type Joint (RTJ) facing configurations
• Corrosion-resistant material grades available for aggressive chemical and marine environments
• ASTM A182 forged grade with PMI-tested material compliance for every batch

ASME B16.5 Socket Weld Raised Face Flanges Specifications

All socket weld raised face flanges are manufactured per ASME B16.5 dimensional standards with material composition verified through optical emission spectroscopy (OES) and X-ray fluorescence (XRF) testing. Each flange batch undergoes hydrostatic pressure testing at 1.5× rated working pressure, ultrasonic thickness measurement, and hardness verification per ASTM E18 Rockwell testing.

Materials Available for Socket Weld Flanges

Material selection depends on operating temperature, pressure, fluid corrosivity, and industry-specific requirements. Each grade is supplied with Material Test Certificates (MTC) per EN 10204 3.1 or 3.2. Contact our technical team for material compatibility guidance.

Socket Weld vs Slip-On vs Weld Neck Flange — Comparison Guide

Choosing the right flange type depends on your application's pressure requirements, pipe size, installation constraints, and budget. The table below provides a direct comparison to support your selection:

When to Choose Socket Weld Flanges:

• Pipe sizes 4" NB and below requiring high-pressure ratings (Class 600 to 2500)
• Systems where leakage must be minimized for hazardous fluids, toxic gases, or high-value media
• Installation spaces where double-sided welding access is limited
• Projects requiring faster installation than slip-on but lower cost than weld neck
• Applications where single-pass fillet welding reduces labour cost and inspection scope

ASME / ANSI B16.5 Socket Weld Raised Face Flange Dimensions (All dimensions in mm)

Class 150 — Socket Weld Raised Face Flange Dimensions

Class 300 — Socket Weld Raised Face Flange Dimensions

Class 600 — Socket Weld Raised Face Flange Dimensions

Socket Weld Flange — Bolt Dimensions

Socket Weld Flanges Facing Types

Raised Face (RF)

Raised Face flanges have a small raised portion around the bore that concentrates gasket compression and improves sealing performance. RF facing is suitable for pressure classes up to 1500 and is used with spiral wound, graphite, or PTFE gaskets.

Ring Type Joint (RTJ)

RTJ flanges contain precision-machined grooves (oval or octagonal cross-section) that accommodate metallic ring gaskets. RTJ facing provides superior sealing under extreme pressure and temperature conditions, making it the preferred choice for Class 2500 and safety-critical applications.

Pressure Classes Available

Advantages of Socket Weld Raised Face Flanges

• High structural strength from forged construction per ASME B16.5 with traceable heat numbers
• Reliable leak-proof sealing because the raised face concentrates gasket load for superior compression
• Excellent pressure handling capability, rated to Class 2500 (PN 420) with appropriate grade
• Reduced risk of turbulence because the smooth bore minimizes erosion and pressure drop
• Better fatigue strength than threaded connections because the fillet weld provides a continuous joint
• Compact and durable design for space-constrained installations
• Suitable for hazardous fluid handling where low leakage risk is critical
• Long service life with corrosion-resistant alloy grades available for aggressive service conditions
• Easy alignment and installation because the socket guides the pipe squarely without complex fit-up

Difference Between Socket Weld Flange and Slip-On Flange

Socket Weld Flange — Installation & Welding Guidelines

Correct installation of socket weld flanges is critical to joint integrity and pressure rating. Follow these guidelines per ASME B31.3 Process Piping and AWS D1.1 welding standards:

Note: All welding must be performed by qualified welders per ASME Section IX procedure qualifications. Welding consumables must match base metal specification.

Applications of ASME B16.5 Socket Weld Raised Face Flanges

• Oil & Gas Refineries: FCC units, hydrocracking, distillation columns, pump suction/discharge connections
• Petrochemical Plants: Ethylene, propylene, aromatics production lines for small bore high-pressure service
• Offshore Platforms: Subsea wellhead systems and topside process piping where leak prevention is mandatory
• LNG & Natural Gas: Liquefaction and regasification terminals, metering stations, compressor stations
• Power Generation: High-pressure steam lines, boiler feed water systems, turbine bypass lines
• Chemical Processing: Ammonia, urea, methanol, chlor-alkali plants for hazardous and corrosive media
• Pharmaceutical: Sanitary process piping, CIP/SIP systems, sterile fluid handling
• Water Treatment: High-pressure reverse osmosis skids, desalination plants, pump discharge headers
• Shipbuilding & Marine: Engine room piping, ballast systems, offshore support vessel process lines
• Hydraulic Systems: High-pressure hydraulic circuits requiring vibration-resistant, leak-proof connections

Manufacturing Process & Quality Testing

All socket weld raised face flanges are manufactured using closed-die forging and multi-axis CNC machining technologies. Forged construction ensures uniform grain structure, superior mechanical properties, and pressure integrity compared to cast alternatives.

Stainless Steel Socket Weld Raised Face Flanges, Alloy Steel Socket Weld Flanges Manufacturer & Exporter.

ASME B 16.5, ASME B 16.47, MSS SP44, ASTM A182, 240, 105, 350, SB564, 160, 472 Duplex SWRF Flanges Suppliers.

We are the leading Manufacturers, Supplier and Exporters of Socket Weld Raised Face Flanges using high quality raw materials. Socket weld flange is similar to the slip-on flange in outline, but the bore is counter-bored to accept pipe.Socket weld flanges are primarily used to make flanged joints where required in small sizes in socket welded pipe specs. These SWRF Flanges is available in various size, grades, Specification & thickness as per the clients requirments. These SWRF flanges are offered at market leading rates.

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Specifications :

Size	½" (15 NB) to 48" (1200NB)
Class	150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS, DIN Standard ND-6,10, 16, 25, 40 Etc.
Standards	ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48
DIN	DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2636, DIN2637, DIN2638, DIN2673
B.S	BS4504 , BS4504, BS1560, BS10
Flange Face Type	Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
Coating/Surface Treatment	Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Grades :

Stainless Steel Socket Weld Raised Face Flanges :

ASTM A182, A240 F 304, 304L, 304H, 316, 316Ti, 316H, 316L, 316LN, 309S, 309H, 310S, 310H,317, 317L, 321, 321H, 347, 347H, 201, 202, 904L

Carbon Steel Socket Weld Raised Face Flanges :

ASTM A 105, ASTM A 350 LF 2, ASTM A694 F52 - F60 - F65 - F70

Alloy Steel Socket Weld Raised Face Flanges :

ASTM A182 F1,F5,F9,F11,F22,F91

Nickel Alloy Socket Weld Raised Face Flanges :

ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No. N10276), Alloy 20 (UNS No. N08020).

Copper Alloy Socket Weld Raised Face Flanges :

ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 10100, 10200, 10300, 10800, 12000, 12200, 70600, 71500, UNS No. C 70600 (Cu -Ni- 90/10), C 71500 (Cu -Ni- 70/30)

Duplex Steel Socket Weld Raised Face Flanges :

ASTM A182, A240 F 44, F 45, F51, F 53, F 55, F 60, F 61

ASME B16.5 Socket Weld Raised Face Flanges Dimensions