Blind Flat Face flanges, or BLFF flanges are solid flanges that are used to seal off the end of vessels or pipe systems. They totally obstruct fluid flow because they lack a bore like other flanges. These flanges are often used when a system needs to be sealed for maintenance or pressure testing. BLFF flanges are made from materials like carbon steel, stainless steel, alloy steel, and more, depending on the application. A reputable manufacturer and supplier of BLFF Flanges Tesco Steel & Engineering provides premium products in sizes ranging from ½" (15 NB) to 48″ (1200 NB) and with surface treatments like galvanizing, zinc plating, and anti-rust paint. We also offer flanges that are packaged in sturdy, export-friendly cases and satisfy ANSI, API and custom specifications.
Each BLFF flange consists of a solid circular plate with a flat surface that rest flush against the mating surface. Complete contact and consistent pressure throughout the gasket area is guaranteed by the flat face. Surface coatings like black oil paint, yellow transparent coating, cold and hot dip galvanizing and zinc plating help protect the flange from rust and wear. These coatings also improve the flange’s life span in harsh environments. While simple in appearance every part of a BLFF flange is designed to ensure secure sealing and long-term performance.
BLFF flanges are used across many industries that demand secure sealing and pressure handling. You'll find them in oil refineries, gas processing plants, off-shore drilling, petrochemical units, fertilizer production, and even in pulp and paper industries. Their primary purpose is to stop the flow in pipes while they are being maintained or when certain parts of the line are not being used. When full face contact is required in low-pressure systems, the flat face design works well.Dimensions often follow standards like ANSI B16.5, B16.47 Series A & B, and others, making them easy to integrate into existing systems.
