Plate Flange (PL)
Flat-type flange with simple structure, light weight and low cost — ideal for low-pressure pipeline systems.
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Blind Flange (BL)
Solid disc flange to seal pipeline ends — reliable isolation for temporary maintenance, inspection or permanent termination.
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BLSteel Pipe Flanges
Overview
Blind Flange (BL) is a flange with a solid disc structure, used to seal the end of the pipeline, prevent the leakage of medium and protect the internal structure of the pipeline. It is connected to the pipeline by bolting, with a simple structure, reliable sealing and strong pressure resistance, and is widely used in all types of pipeline systems that need to be sealed temporarily or permanently. As an essential sealing component in pipeline systems, it meets the needs of export projects and industrial applications worldwide.
Size Range
½" – 56" (DN15 – DN1400)
Pressure Class
Class 150 – 2500 / PN10 – PN100
Key Features
- Reliable sealing — solid disc with high-precision sealing surface and gasket
- Strong pressure resistance — thick disc design for low, medium and high pressure
- Simple structure and easy installation — bolted connection, easy disassembly for maintenance
- Wide application — temporary sealing (maintenance, inspection) or permanent end closure
- Global standard compliance — manufactured per ISO, ASME, DIN, EN, JIS and GB standards
- Sealing surfaces: RF, FF, RTJ and MFM
- Custom bore, tap holes and materials per project drawing
Benefits
- Positive shut-off with proven gasket sealing performance
- Full pressure-class rating matched to line flanges
- Quick to install and remove for system access
- Customized to customer drawings, materials and standards
Specifications
| Standards | ISO 7005, ASME B16.5, DIN 2501, EN 1092-1, JIS B2220, GB/T 9113, HG/T 20592, HG/T 20615 |
| Materials | Carbon steel (A105, 20#, Q235B), stainless steel (304, 316L), alloy steel (16Mn, F11, F22) — customizable per medium and conditions |
| Pressure Ratings | Class 150, 300, 600, 900, 1500, 2500 / PN10 – PN100 |
| Nominal Diameter | DN15 – DN1400 (NPS ½" – 56") |
| Sealing Surface | RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint), MFM (Male-Female Face) |
| Working Temperature | -40°C – 600°C (high-temperature grades on request) |
Applications
Petroleum and petrochemical pipeline systemsNatural gas transmission and distributionPower generation and chemical engineeringWater supply, drainage and HVACPipeline end sealing and equipment interfacesTemporary isolation during maintenance and inspection
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Standards
- • ISO 7005
- • ASME B16.5
- • DIN 2501
- • EN 1092-1
- • JIS B2220
- • GB/T 9113
- • HG/T 20592
- • HG/T 20615
Materials
- • Carbon Steel: A105, 20#, Q235B
- • Stainless Steel: 304, 316L
- • Alloy Steel: 16Mn, F11, F22
Related Products
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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Lap Joint Flange (LJ)
Loose flange with stub end — convenient disassembly for large-diameter, low and medium pressure systems.
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