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Socket Weld Flanges

The socket weld flange (SW flange) is a precision-forged connection designed for high-pressure, small-bore piping systems. Its machined internal shoulder controls pipe insertion depth and ensures a consistent 1.6 mm expansion gap prior to fillet welding – delivering fatigue strength 50% superior to double-welded slip-on flanges. Available in carbon, alloy, and stainless steel, it meets ASME B16.5 across Class 150–2500, making it a robust, export-grade solution for demanding process and utility pipelines.
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Description

The socket weld flange (SW flange) is a precision-forged connection designed for high-pressure, small-bore piping systems. Its machined internal shoulder controls pipe insertion depth and ensures a consistent 1.6 mm expansion gap prior to fillet welding – delivering fatigue strength 50% superior to double-welded slip-on flanges. Available in carbon, alloy, and stainless steel, it meets ASME B16.5 across Class 150–2500, making it a robust, export-grade solution for demanding process and utility pipelines.

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Design Features

Feature Details
Body Design Forged solid hub body with precision-machined internal shoulder bore; controls pipe insertion depth and maintains concentric alignment
Connection Type Socket insertion + single external fillet weld; no internal welding required; no pre-bevel preparation on pipe end
Leak Protection Fillet-welded joint with mandated 1.6 mm expansion gap; RF or RTJ sealing face with spiral-wound gasket for rated zero-leak performance
Corrosion Resistance Stainless F304/L and F316/L grades for corrosive media; carbon grades with optional external coating; not recommended for radioactive or severely corrosive environments at the socket gap
Pressure Handling Rated Class 150 to Class 2500 per ASME B16.5; standard sizes up to 24″ at full pressure range; custom heavy-wall up to 60″ at Class 900
Temperature Resistance –196 °C to +600 °C; LF1/LF2 grades for cryogenic service; F91 alloy grade for elevated-temperature creep service
Maintenance Welded joint is permanent; joint inspection via RT or PT/MT NDT; replacement requires cut-out and re-weld; face gasket replaceable
Durability Fatigue life 50% greater than double-welded slip-on flange; forged grain structure resists cyclic stress, vibration, and pressure surge
Automation Compatibility Consistent bore shoulder enables mechanised pipe insertion; compatible with automated fillet welding cells for high-volume fabrication
Industrial Standards ASME B16.5 · ASTM A105 · ASTM A182 · ASTM A350 LF1/LF2 · ASTM A181 · MSS SP-44

Technical Specifications

Specification Details
Product Type Socket Weld Flange (SW / SWF)
Size Range ½″ to 24″ (standard); 24″ to 60″ (custom, ≤Class 900)
Material Grade ASTM A105 (CS); A350 LF1/LF2 (low-temp CS); A182 F5/F9/F11/F22/F91 (Alloy); A182 F304/L, F316/L (SS)
End Connection Socket bore (internal shoulder) + external fillet weld
Pressure Rating Class 150 / 300 / 400 / 600 / 900 / 1500 / 2500
Temperature Range –196 °C to +600 °C (grade-dependent)
Seat Material Integral forged body face; sealing via spiral-wound or ring-joint gasket per ASME B16.20
Operation Type Static pipe connection; permanent fillet-welded assembly
Port Type Full bore; shoulder-stepped socket bore
Surface Finish Serrated concentric RF; RTJ groove to ASME B16.5; Ra 3.2–6.3 μm on sealing face
Wall Thickness Schedule 40 to Schedule 160
Manufacturing Std. ASME B16.5 · ASTM A181 · MSS SP-44

Benefits & Application

Key Benefits Target Applications
50% higher fatigue life vs slip-on flange High-pressure small-bore oil & gas lines
No pipe-end bevelling required pre-weld Chemical & petrochemical processing
External weld only — bore remains undisturbed Steam distribution & power generation
Shoulder bore ensures precise pipe alignment Hydraulic & instrumentation piping
Replaces threaded flanges for improved leak safety Water treatment & utility services
Wide grade range for extreme temperatures Cryogenic & LNG service lines
Compact design for confined installations Marine, offshore & shipbuilding
Class 2500-rated for extreme-pressure service Refineries, HVAC & pharmaceutical plants

Testing Parameters

Test Type Description
Hydrostatic (Shell) Test 1.5× rated pressure applied to assembled body and socket bore; minimum 30-second hold; verifies structural soundness per ASME B16.5 / API 598
Pneumatic Test Air or nitrogen at 1.1× rated pressure; applied where water contamination is unacceptable; leak detection via soap-bubble or underwater submersion method
Shell Test Full-body pressure containment test confirming wall integrity under maximum allowable working pressure; no visible deformation or seepage permitted
Seat / Face Leakage Test Sealing face and gasket interface tested under rated pressure to confirm zero bypass; both RF and RTJ face configurations independently verified
Pressure Endurance Test Cyclic pressure loading at full rated class; validates resistance to fatigue cracking at socket weld junction under simulated service cycling
Material Inspection PMI (XRF) for alloy verification; mill test certificate (MTC) per EN 10204 3.1/3.2; heat number traceability on each piece
Dimensional Accuracy 100% check against ASME B16.5 drawings; bore ID, socket depth, shoulder recess, OD, bolt-circle, and face thickness verified per lot
Surface Finish Inspection Sealing face Ra measured per ASME B46.1; visual, MT, and PT NDT conducted on weld zone and body surface for cracks or inclusions
Quality Certification ISO 9001:2015 QMS; NACE MR0175 for sour service; third-party inspection (TPI) by SGS, BV, or TÜV on request; CE marking for EU export

Socket Weld Flanges

The socket weld flange (SW flange) is a precision-forged connection designed for high-pressure, small-bore piping systems. Its machined internal shoulder controls pipe insertion depth and ensures a consistent 1.6 mm expansion gap prior to fillet welding – delivering fatigue strength 50% superior to double-welded slip-on flanges. Available in carbon, alloy, and stainless steel, it meets ASME B16.5 across Class 150–2500, making it a robust, export-grade solution for demanding process and utility pipelines.

Design Features

Feature Details
Body Design Forged solid hub body with precision-machined internal shoulder bore; controls pipe insertion depth and maintains concentric alignment
Connection Type Socket insertion + single external fillet weld; no internal welding required; no pre-bevel preparation on pipe end
Leak Protection Fillet-welded joint with mandated 1.6 mm expansion gap; RF or RTJ sealing face with spiral-wound gasket for rated zero-leak performance
Corrosion Resistance Stainless F304/L and F316/L grades for corrosive media; carbon grades with optional external coating; not recommended for radioactive or severely corrosive environments at the socket gap
Pressure Handling Rated Class 150 to Class 2500 per ASME B16.5; standard sizes up to 24″ at full pressure range; custom heavy-wall up to 60″ at Class 900
Temperature Resistance –196 °C to +600 °C; LF1/LF2 grades for cryogenic service; F91 alloy grade for elevated-temperature creep service
Maintenance Welded joint is permanent; joint inspection via RT or PT/MT NDT; replacement requires cut-out and re-weld; face gasket replaceable
Durability Fatigue life 50% greater than double-welded slip-on flange; forged grain structure resists cyclic stress, vibration, and pressure surge
Automation Compatibility Consistent bore shoulder enables mechanised pipe insertion; compatible with automated fillet welding cells for high-volume fabrication
Industrial Standards ASME B16.5 · ASTM A105 · ASTM A182 · ASTM A350 LF1/LF2 · ASTM A181 · MSS SP-44

Technical Specifications

Specification Details
Product Type Socket Weld Flange (SW / SWF)
Size Range ½″ to 24″ (standard); 24″ to 60″ (custom, ≤Class 900)
Material Grade ASTM A105 (CS); A350 LF1/LF2 (low-temp CS); A182 F5/F9/F11/F22/F91 (Alloy); A182 F304/L, F316/L (SS)
End Connection Socket bore (internal shoulder) + external fillet weld
Pressure Rating Class 150 / 300 / 400 / 600 / 900 / 1500 / 2500
Temperature Range –196 °C to +600 °C (grade-dependent)
Seat Material Integral forged body face; sealing via spiral-wound or ring-joint gasket per ASME B16.20
Operation Type Static pipe connection; permanent fillet-welded assembly
Port Type Full bore; shoulder-stepped socket bore
Surface Finish Serrated concentric RF; RTJ groove to ASME B16.5; Ra 3.2–6.3 μm on sealing face
Wall Thickness Schedule 40 to Schedule 160
Manufacturing Std. ASME B16.5 · ASTM A181 · MSS SP-44

Benefits & Application

Key Benefits Target Applications
50% higher fatigue life vs slip-on flange High-pressure small-bore oil & gas lines
No pipe-end bevelling required pre-weld Chemical & petrochemical processing
External weld only — bore remains undisturbed Steam distribution & power generation
Shoulder bore ensures precise pipe alignment Hydraulic & instrumentation piping
Replaces threaded flanges for improved leak safety Water treatment & utility services
Wide grade range for extreme temperatures Cryogenic & LNG service lines
Compact design for confined installations Marine, offshore & shipbuilding
Class 2500-rated for extreme-pressure service Refineries, HVAC & pharmaceutical plants

Testing Parameters

Test Type Description
Hydrostatic (Shell) Test 1.5× rated pressure applied to assembled body and socket bore; minimum 30-second hold; verifies structural soundness per ASME B16.5 / API 598
Pneumatic Test Air or nitrogen at 1.1× rated pressure; applied where water contamination is unacceptable; leak detection via soap-bubble or underwater submersion method
Shell Test Full-body pressure containment test confirming wall integrity under maximum allowable working pressure; no visible deformation or seepage permitted
Seat / Face Leakage Test Sealing face and gasket interface tested under rated pressure to confirm zero bypass; both RF and RTJ face configurations independently verified
Pressure Endurance Test Cyclic pressure loading at full rated class; validates resistance to fatigue cracking at socket weld junction under simulated service cycling
Material Inspection PMI (XRF) for alloy verification; mill test certificate (MTC) per EN 10204 3.1/3.2; heat number traceability on each piece
Dimensional Accuracy 100% check against ASME B16.5 drawings; bore ID, socket depth, shoulder recess, OD, bolt-circle, and face thickness verified per lot
Surface Finish Inspection Sealing face Ra measured per ASME B46.1; visual, MT, and PT NDT conducted on weld zone and body surface for cracks or inclusions
Quality Certification ISO 9001:2015 QMS; NACE MR0175 for sour service; third-party inspection (TPI) by SGS, BV, or TÜV on request; CE marking for EU export

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