Slip On Flange (SO)
Sleeve-type flange slipped over the pipe and fixed by fillet welding — economical for medium and low pressure systems.
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Plate Flange (PL)
Flat-type flange with simple structure, light weight and low cost — ideal for low-pressure pipeline systems.
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PLSteel Pipe Flanges
Overview
Plate Flange (PL) is a common flat-type flange with a simple structure, light weight and low cost, widely used in low-pressure pipeline systems. It is connected to the pipe by welding or bolting, with a flat sealing surface, which is easy to process and install. As a cost-effective flange type, it is widely used in general industrial pipelines and civil pipeline systems and export projects worldwide.
Size Range
½" – 56" (DN15 – DN1400)
Pressure Class
Class 150 – 300 / PN10 – PN25
Key Features
- Simple structure and low cost — economical for large-scale low-pressure projects
- Easy installation and maintenance — flat face aids alignment and servicing
- Wide application range — low-pressure, normal-temperature, non-corrosive media
- Standardized production per ISO, ASME, DIN, EN, JIS and GB specifications
- Customizable size, material and sealing surface type
- Sealing surfaces: FF (Flat Face) and RF (Raised Face)
- Connected by welding or bolting to pipe or equipment
Benefits
- Lowest-cost flange type for budget-sensitive projects
- Uniform global specifications — easy to replace and match components
- Ideal for non-corrosive, low-pressure, normal-temperature service
- Customized per customer drawings, materials and standards
Specifications
| Standards | ISO 7005, ASME B16.5, DIN 2501, EN 1092-1, JIS B2220, GB/T 9119, HG/T 20592, HG/T 20615 |
| Materials | Carbon steel (A105, 20#, Q235B), stainless steel (304, 316L), alloy steel (16Mn) — customizable per medium and conditions |
| Pressure Ratings | Class 150, 300 / PN10, PN16, PN25 |
| Nominal Diameter | DN15 – DN1400 (NPS ½" – 56") |
| Sealing Surface | FF (Flat Face), RF (Raised Face) |
| Working Temperature | -20°C – 300°C (special grades on request) |
Applications
Water supply and drainageHVAC systemsLow-pressure chemical engineeringFood and beverage processingPharmaceutical and civil constructionGeneral industrial and non-corrosive pipeline systems
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Standards
- • ISO 7005
- • ASME B16.5
- • DIN 2501
- • EN 1092-1
- • JIS B2220
- • GB/T 9119
- • HG/T 20592
- • HG/T 20615
Materials
- • Carbon Steel: A105, 20#, Q235B
- • Stainless Steel: 304, 316L
- • Alloy Steel: 16Mn
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Loose flange with stub end — convenient disassembly for large-diameter, low and medium pressure 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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