Lap Joint Flanges (LJ)
Rotational Freedom & Cost-Effective Exotic Material Solutions
Lap joint flanges are used in conjunction with stub ends to create a connection system that allows the flange to rotate freely for easy bolt hole alignment. The stub end is welded to the pipe using expensive exotic materials, while the lap joint flange can be made from less expensive carbon steel, significantly reducing overall system costs when working with corrosion-resistant alloys or stainless steels.
This flange type is particularly advantageous in systems that require frequent dismantling for inspection or maintenance, as the loose flange rotates independently of the piping. They are commonly used in lower pressure applications where the cost savings and installation flexibility outweigh the need for the highest pressure ratings. The design is ideal for connecting dissimilar metals while avoiding galvanic corrosion issues.
Key Advantages
- 360° rotation capability
- Easy bolt hole alignment
- Cost-effective exotic materials
- Frequent disassembly friendly
- Dissimilar metal connections
- Reduced material costs
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