Product Information
Lap-joint Flange
- Mainly used when frequent dismantling is necessay
Product Overview
The Stainless Steel Lap-Joint Flange is a two-component assembly comprising a stub end (butt-welded to the pipe) and a backing flange (slips over the stub end). This design enables easy alignment and disassembly for maintenance, making it ideal for systems requiring frequent modifications or corrosive/abrasive media handling.
Key Features
Material Compatibility:
Stub ends: ASTM A403 WP304/316/316L, duplex 2205, or SAE 405 stainless steel for corrosion resistance
Backing flanges: Carbon steel or lower-grade stainless steel (cost-saving)
Pressure Range: ASME Class 150 to 2500, with pressure ratings up to 32 MPa (4640 psi)
Interchangeability: Compatible with ANSI B16.5, DIN, and JIS standards for global adaptability
Technical Specifications
| Size Range | ½" to 60" (DN15 to DN1500)57 |
| Face Types | Raised Face (RF), Flat Face (FF)57 |
| Surface Finish | Electro-polished (hygienic applications) or sandblasted (industrial)78 |
| Temperature Range | -50°F to 800°F (-45°C to 427°C)57 |
Applications
Chemical Processing: Frequent system reconfiguration in acid/alkali transfer lines
Oil & Gas: Pipeline systems requiring periodic inspection and component replacement
Pharmaceuticals: Hygienic systems with CIP/SIP compliance
Installation Guidelines
Stub End Welding: Butt-weld the stub end to the pipe, ensuring full penetration and smooth internal alignment
Flange Assembly: Slide the backing flange over the stub end and align with mating flange bolts
Gasket Sealing: Use PTFE or spiral-wound gaskets for leak-proof connections under thermal cycling
Certifications
ANSI B16.5 compliance for dimensional standardization
ISO 9001:2025 quality assurance
