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Lap-Joint Flanges

Lap-joint flanges, similar to slip-on flanges, feature a radius at the bore and flange face to accommodate a lap stub end, with the stub end’s face forming the gasket surface. They enable quick dismantling for inspection or replacement in piping systems.

These flanges are ideal for applications requiring frequent maintenance, offering cost-effective and flexible connections in industries like chemical processing, water treatment, and oil and gas.

Lap-Joint Flanges

Lap-joint flanges are designed for systems needing easy disassembly, featuring a radiused edge to fit a lap stub end, which provides the sealing surface for the gasket. Unlike welded flanges, they are not fixed to the pipe, allowing rotation and alignment flexibility during installation. This makes them perfect for applications where sections of piping must be frequently removed for cleaning, inspection, or replacement, offering both convenience and cost savings in maintenance-heavy environments.

Key Properties of Lap-Joint Flanges

  • Ease of Dismantling: Allows quick removal for inspection or replacement.
  • Alignment Flexibility: Rotatable design simplifies installation and alignment.
  • Cost-Effective: Stub end handles sealing, reducing flange material costs.
  • Maintenance-Friendly: Ideal for systems requiring frequent access.

Common Grades and Equivalents

Lap-joint flanges are manufactured to meet industry standards, ensuring compatibility and performance in various piping applications.

Grade/Standard Equivalent Application
ASTM A105, ANSI B16.5 Carbon Steel Oil and gas, general piping
ASTM A182 F304/F316 Stainless Steel Chemical processing, food industry
ASTM A350 LF2 Low-Temperature Carbon Steel Low-temperature piping systems

Applications of Lap-Joint Flanges

Lap-joint flanges are essential in industries requiring frequent maintenance and flexible piping connections:

  • Chemical Processing: Facilitates quick access for cleaning or inspection.
  • Oil and Gas: Used in systems needing periodic maintenance.
  • Water Treatment: Supports easy dismantling in treatment facilities.
  • Food and Beverage: Ensures hygienic connections with frequent disassembly.

Specifications

Properties Values & Limits
Material Carbon Steel, Stainless Steel, Alloy Steel
Standards ASME B16.5, ANSI B16.47, MSS-SP-44
Connection Used with Lap Stub End
Size Range 1/2" to 24" (Standard), up to 48" (Custom)
Pressure Rating 150#, 300#, 600#, 900#

Considerations for Use

  • Stub End Compatibility: Ensure proper fit with lap stub end for effective sealing.
  • Pressure Limitations: Not suitable for high-pressure applications due to non-welded design.
  • Material Selection: Match flange and stub end materials to prevent corrosion.