PLSteel Pipe FlangesPlate Flange (PL)
Flat-type flange with simple structure, light weight and low cost — ideal for low-pressure pipeline systems.
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Socket Weld Flange (SW)
Socket bore flange with fillet weld — compact and reliable for small-bore, high-pressure systems.
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SWSteel Pipe Flanges
Overview
Socket Weld Flange (SW) features a socket structure where the pipe is inserted into the flange bore and fixed by fillet welding. It offers compact structure, small volume, reliable sealing and strong pressure resistance — making it the preferred flange type for small-diameter, high-pressure and high-precision pipeline systems.
Size Range
½" – 4"
Pressure Class
Class 300 – 2500 / PN25 – PN100
Key Features
- Compact design for confined spaces
- Socket bore with fillet weld connection
- Smooth internal flow transition
- RF, FF and RTJ facing options
- High pressure ratings in small sizes
Benefits
- Strong fillet-weld joint in compact envelope
- Reduced turbulence vs threaded connections
- Ideal for high-pressure small-bore service
Specifications
| Standards | GB/T 9117, ASME B16.5, EN 1092-1 |
| Pressure Ratings | Class 300 – 2500 / PN25 – PN100 |
| Nominal Diameter | DN15 – DN100 (NPS ½" – 4") |
| Working Temperature | -40°C – 550°C |
| Connection | Socket weld per ANSI B16.11 |
Applications
Oil and gas instrumentationSteam and condensate linesChemical and petrochemical small-boreNuclear and power plant piping
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Standards
- • ISO 7005
- • ASME B16.5
- • EN 1092-1
- • DIN 2501
- • JIS B2220
- • GB/T 9115–9119
- • HG/T 20592
Materials
- • Carbon Steel: A105, 20#, Q235B, A234 WPB
- • Stainless Steel: 304, 304L, 316, 316L, 321
- • Alloy Steel: 16Mn, F11, F22, 15CrMo
- • Duplex & Super Duplex: F51, F53, 2205
- • Special alloys: Monel, Hastelloy, Titanium (on request)
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Sleeve-type flange slipped over the pipe and fixed by fillet welding — economical for medium and low pressure systems.
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Loose flange with stub end — convenient disassembly for large-diameter, low and medium pressure systems.
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