Lap Joint Pipe Flange
With a loose-fitting two-component design at its core, the pipe connection flange has completely solved the problems of frequent maintenance, thermal displacement compensation and precise alignment of bolt holes, making it a smart choice for high-pressure and high-temperature systems in petrochemical, power, shipping and other industries.
- Product Introduction
Products Description
Lap joint pipe flanges are mainly used in piping systems that require frequent disassembly and assembly and are sensitive to center deviation. When used in conjunction with stub ends, they can significantly reduce installation difficulty and stress concentration, and are widely used in low-pressure, non-critical sealing applications.
Manufacturing Process
Raw Materials: Q235/A105/SS304/SS316 steels are used, all conforming to ASTM/EN standards.
Forging/Casting: Free forging or precision casting is selected based on the diameter and pressure rating to ensure high flange structural density and stable mechanical properties.
Machining: Sealing surfaces, bolt holes, and inner bores are machined using CNC lathes to ensure concentricity and surface roughness meet ASME B16.5 requirements.
Inspection and Testing: 100% dimensional inspection; random sampling for PMI, hardness, and mechanical property testing; third-party inspection (SGS/BV/TUV) is available.
Customization Options
Sizes: 1/2"–48", Class 150–Class 600
Standards: ASME B16.5 / B16.47 / EN1092-1 / JIS / GOST
Materials: Carbon steel, stainless steel, alloy steel, duplex steel
Accessories: Stub End (long/short, customizable)
Surface Treatments: Rust-preventive oil, hot-dip galvanizing, black paint, EP coating
Packaging and Transportation
Rust Prevention: Each piece is coated with rust-preventive oil; additional moisture-proof bags are used in wet areas.
Structural Protection: Protective covers are added to sealing surfaces; flanges are stacked in layers to prevent impact damage.
Load-Bearing Safety: 1-ton/2-ton pallets are used to ensure the container does not collapse during loading.
Transportation Methods: Sea, land, and air freight are supported; assistance is provided to offer the lowest freight rates.
Why Choose Us
12 years of flange manufacturing experience, focusing on the export wholesale market.
100% CNC precision machining, dimensional accuracy meets ASME/EN standards.
Sufficient stock, fast delivery of standard Lap Joint flanges in 7–10 days.
Exporting to 30+ countries, providing stable service to engineering contractors and wholesalers.
FAQ
Q: Which standards are supported?
A: ASME B16.5, B16.47, EN1092-1, etc., including MTC 3.1.
Q: Material/Pressure Rating?
A: CS/SS/Alloy, Class 150–600.
Q: Is it customizable?
A: Custom drawings and matching stub ends are supported.
Q: MOQ?
A: Standard 10–20 pieces.
Q: How is quality guaranteed?
A: 100% dimensional inspection + material certification, third-party testing available.
Q: Lead time?
A: Standard 7–15 days.
Q: Is the packaging secure?
A: Pallet + wooden crate + protective cover, suitable for export.
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