The Lap Joint Flange (LJ) is a specialized piping component designed for systems that require frequent disassembly or involve highly corrosive media. It works in conjunction with a lap joint stub end welded to the pipe, allowing the flange ring to rotate freely, which simplifies alignment during installation.Manufactured from high-grade stainless steel (304/316/304L/316L), our lap joint flanges are precision machined for flatness and dimensional accuracy. The smooth surface treatment ensures a tight seal with gaskets, preventing leaks even in demanding conditions. This design also allows for the use of different materials for the stub end and flange ring, helping to optimize costs while maintaining corrosion resistance.
Why Choose Us / Advantage
Material Traceability: Mill test certificates (MTC) provided for each batch of stainless steel materials.
Third-Party Test Available: We support SGS, BV or TUV third-party inspection at our factory.
Fast Lead Time: Standard sizes are in stock, ready to ship in 3-7 days; customized orders take 15-30 days.
Export Packaging: Rust-proof treatment + fumigated plywood cases, with flange protectors included.
12-Month Quality Warranty: Free replacement or repair for non-artificial damage within the warranty period.
Technical Data
★ Standard: ANSI/ASME B16.5, GB/T 9118, DIN 2642
★ Body Material: Stainless Steel (304, 316, 304L, 316L)
★ Pressure Class: Class 150, 300, 600 (PN10~PN100)
★ Size Range: DN15 ~ DN600 (1/2" ~ 24")
★ Face Type: Raised Face (RF), Flat Face (FF)
★ Surface Treatment: Pickling & Passivation, Mirror Polishing Optional
Applications
● Corrosive media pipelines in chemical and petrochemical plants
● Marine and offshore platform piping systems
● Food and pharmaceutical processing pipelines requiring hygiene and corrosion resistance
● Pipelines made of expensive corrosion-resistant alloys (titanium, duplex steel)
● Systems requiring frequent disassembly for maintenance
