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Understanding Lap Joint Flanges

A Lap Joint Flange consists of two components: a stub end and a backing flange. The stub end is butt-welded to the pipe, while the backing flange rotates freely around it, allowing for easy bolt hole alignment during assembly.

Design Features

• Two-piece construction: stub end + backing flange
• Backing flange rotates freely for bolt alignment
• Stub end provides pressure containment
• Available in various materials and finishes

Key Advantages

1. Easy Alignment: Rotating flange simplifies bolt hole matching
2. Cost Savings: Backing flange can be lower-grade material
3. Quick Disassembly: Ideal for systems requiring frequent maintenance
4. Reduced Installation Time: No need to rotate pipe for alignment
5. Đa năng: Compatible with various stub end materials

Typical Applications

• Low-pressure piping systems
• Systems requiring frequent disassembly
• Large diameter piping where alignment is challenging
• Water treatment and distribution systems
• HVAC and fire protection systems
• Process piping with expansion joints

Material Combinations

Component	Material Options
Stub End	304/316 Stainless, Carbon Steel, Duplex
Backing Flange	Carbon Steel (cost-effective option)

Standards

• ASME B16.5: Class 150-2500
• EN 1092-1: PN6-PN100
• GB/T 9115: Chinese lap joint flange standard

Installation Tips

1. Ensure stub end is properly welded to pipe
2. Verify backing flange rotates freely
3. Check gasket seating surface is clean
4. Tighten bolts in cross pattern

Lap joint flanges offer an economical and practical solution for piping systems requiring frequent maintenance or where precise bolt alignment is challenging.

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