Blind Flange, also known as Blind Plate, is a solid flange without a bore, designed to close the end of a pipeline or vessel opening.
It provides a reliable and pressure-tight sealing solution for pipeline isolation, pressure testing, and future expansion of piping systems.
Blind flanges are widely used in oil & gas, petrochemical, power generation, offshore platforms, pressure vessels, and industrial piping systems where safety and system integrity are critical.
Key Features & Advantages
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Solid design for complete pipeline isolation
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High mechanical strength and excellent pressure resistance
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Suitable for pressure testing and system maintenance
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Easy removal for inspection or future line connection
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Available in RF, FF and RTJ facing types
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Custom drilling and machining available
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Long service life under harsh operating conditions
Standards Compliance
Our Blind Flanges are manufactured in accordance with major international standards:
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ASME B16.5 / ASME B16.47
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EN 1092-1
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DIN Series
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JIS B2220
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GOST 12820 / GOST 33259 (Russia & CIS markets)
Materials & Grades
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Carbon Steel: ASTM A105, ASTM A350 LF2
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Stainless Steel: ASTM A182 F304 / F316 / F321
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Alloy Steel: ASTM A182 F11 / F22 / F5 / F9 / F91
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Low Temperature Steel: ASTM A350 LF3
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Special Materials: Duplex Stainless Steel, Inconel, Monel, Hastelloy
Size & Pressure Range
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Size: DN15 – DN2000 (1/2" – 80")
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Pressure Class: Class 150 – Class 2500
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Facing Types: RF / FF / RTJ
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Connection Type: Bolted Flange
Manufacturing Process
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Forging or plate cutting
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CNC machining
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Heat treatment
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Dimensional inspection
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Surface finishing (anti-rust oil, black paint, epoxy coating, zinc coating)
Quality Control & Inspection
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Chemical composition analysis
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Mechanical property testing
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Dimensional inspection
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PMI (Positive Material Identification)
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NDT: UT / MT / PT / RT (upon request)
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Mill Test Certificate (EN 10204 3.1) provided
Applications
Blind Flanges are widely used in:
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Oil & gas transmission pipelines
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Petrochemical and chemical plants
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Power generation systems
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Offshore and marine installations
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Pressure vessels and storage tanks
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Water treatment and industrial piping systems
Why Choose Our Blind Flanges
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Produced in accordance with international standards (ASME / EN / DIN / JIS / GOST)
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Full range of sizes and pressure classes
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Stable supply for bulk and project orders
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Custom machining based on drawings
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Strict quality control and inspection system
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Extensive export experience