Ferrobend manufactures and supplies premium quality Flat Face Lap Joint Flanges (FF) engineered for frequent dismantling, corrosion-resistant piping systems, and easy alignment during installation and maintenance. Designed to work with a lap-joint stub end, the loose flange arrangement allows the flange to rotate freely around the pipe, providing convenient bolt-hole alignment and repeated disassembly while maintaining reliable performance in industrial piping, chemical processing, petrochemical, water treatment, and process piping applications.
A Flat Face Lap Joint Flange (FF LJ Flange) is part of a two-piece lap joint assembly consisting of a loose backing flange and a stub end. The backing flange fits over the stub end and remains free to rotate, making bolt-hole alignment easier during installation. The stub end is welded to the pipe, while the backing flange provides the bolting connection.
The flat face design provides a broad gasket seating surface, while the rotating backing flange makes the assembly suitable for frequent disassembly, maintenance, and low-pressure piping applications. It is also commonly used with cast iron and other sensitive equipment, subject to the applicable standard, material, pressure class, and service conditions.
A key advantage of the Lap Joint Flange design is material flexibility. A carbon steel backing flange can be paired with a corrosion-resistant stub end, such as stainless steel or nickel alloy, helping reduce material costs while providing corrosion resistance at the wetted end of the connection.
The loose backing flange can rotate around the stub end, simplifying alignment of opposing flange bolt holes.
A carbon steel backing flange can be paired with a stainless steel or nickel alloy stub end for suitable corrosive services.
The connection can be unbolted and reassembled without disturbing the welded stub end, making maintenance easier.
The flat face design helps minimize excessive localized loading on cast iron, FRP, and plastic equipment.
The Lap Joint assembly allows easier access for inspection, cleaning, and system maintenance without cutting or re-welding the pipe.
Flat Face Lap Joint Flanges (FF LJ Flanges) are preferred where easy bolt-hole alignment, frequent disassembly, and material flexibility are important. The loose backing flange can rotate around the stub end, making installation and maintenance easier without disturbing the welded pipe connection. The design also allows a suitable corrosion-resistant stub end to be combined with a lower-cost backing flange, making it a practical choice for low-pressure and general industrial piping systems.
The Flat Face Lap Joint Flange (FF LJ Flange) is a two-piece flange assembly designed for easy installation, bolt-hole alignment, and frequent maintenance in suitable piping applications. It consists of a Lap Joint Stub End permanently welded to the pipe and a loose backing flange that fits over the stub end and remains free to rotate.
The flat face provides a broad gasket seating area, while the rounded transition at the lower bore allows the backing flange to fit properly over the stub end. This construction supports reliable sealing and makes Flat Face Lap Joint Flanges particularly useful where frequent disassembly, material flexibility, and easy maintenance are important.
Flat Face Lap Joint Flanges (FF LJ Flanges) offer a flexible and economical solution where easy bolt-hole alignment, frequent disassembly, and material flexibility are important. The loose backing flange can rotate around the stub end, simplifying installation, while the stub end material can be selected separately to suit the process fluid. This makes the design particularly useful for maintenance-intensive, low-pressure, and general industrial piping applications.
The rotating backing flange simplifies alignment with opposing flange bolt holes during installation.
A lower-cost carbon steel backing flange can be combined with a stainless steel or alloy stub end where corrosion resistance is required.
Allows easy unbolting, inspection, gasket replacement, and maintenance without disturbing the welded stub end.
The flat face design helps minimize excessive localized loading on cast iron, FRP, and PVC equipment.
The stub end material can be selected independently to provide suitable corrosion resistance and fluid compatibility.
Ferrobend manufactures Flat Face Lap Joint Flanges in a comprehensive range of Stainless Steel, Carbon Steel, Alloy Steel, Duplex Stainless Steel, Super Duplex Stainless Steel, Nickel Alloys, Titanium, Copper Alloys, and other special engineering materials for demanding industrial applications.
304 • 304L • 316 • 316L
321 • 347 • + More Grades
A105 • LF2 • A350
A694 • A516 • + More Grades
F5 • F9 • F11 • F22
F91 • F92 • + More Grades
F51 • F60 • F52
F44 • S31803 • + More Grades
F53 • F55 • F61
S32750 • S32760 • + More Grades
200 • 201 • 625
825 • C276 • + More Grades
Inconel • Monel • Hastelloy
Incoloy • Alloy 20 • + More Grades
C70600 • C71500 • Brass
Bronze • Cu-Ni • + More Grades
Grade 2 • Grade 5 • Grade 7
Grade 12 • Grade 23 • + More Grades
Shaped by heating a solid billet and compressing it under high pressure, aligning the grain flow for superior strength and pressure resistance.
Machined directly from a flat metal plate without forging — a cost-effective option for low-pressure or non-critical applications.
Our products are tested and certified as per international quality standards with complete traceability and documentation.
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