Steel Blind Flanges

Steel flange blind flanges are specialized forged components designed to seal the end of piping systems or pressure vessels. Featuring a solid, centerless circular plate, they are bolted to mating flanges at pipe terminals to achieve reliable isolation and sealing. Key characteristics, specifications, and technical details are as follows: – Core Definition : A solid-faced flange with no central bore, engineered for end-capping piping systems/pressure vessels, providing positive shut-off, pressure containment, and debris protection. – Structural Features : Integral forged solid plate (eliminates leakage points), standardized bolt hole patterns (compatible with matching flanges), and precision-machined sealing faces (ensures tight fit with gaskets). – Material Scope : Carbon steel (A105, Q235B), stainless steel (304L, 316L, duplex 2205/2507), alloy steel (A182 F11/F22) – forged to international standards (ASTM, EN, JIS) for corrosion resistance, pressure-bearing capacity, and structural rigidity. – Key Specifications : – Size Range: DN10 – DN3600 (customizable to non-standard dimensions); compatible with NPS (1/2″ – 144″) and JIS A-series (15A – 1500A). – Pressure Class: PN0.1 – PN420 / Class 150 – 2500 (adapts to low, medium, and ultra-high pressure systems). – Sealing Face Types: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) – matched to mating flange specifications. – Connection Method : Bolted joint (with gaskets: spiral wound, non-asbestos, PTFE) – detachable for maintenance, no welding required (reduces installation complexity). – Core Advantages : – Superior sealing performance (prevents fluid/gas leakage and debris ingress); – Forged solid structure ensures high pressure-bearing capacity and resistance to deformation under cyclic loads; – Corrosion-resistant (suitable for harsh media: chemicals, seawater, acidic/alkaline fluids); – Facilitates system isolation during maintenance, inspection, or shutdown without pipe modification. – Application Scope : Widely used in oil & gas (pipeline terminals, pressure vessels), chemical processing (reactor end caps, batch process isolation), power generation (boiler systems, condensate lines), marine (shipboard piping), and municipal engineering (water supply/drainage system shut-off) – ideal for scenarios requiring temporary or permanent end-sealing and pressure control.