What Is a Lap Joint Flange?

What Is a Lap Joint Flange?

A lap joint flange is a special flange used together with a stub end. Unlike a weld neck flange, the lap joint flange does not need to be permanently welded to the pipe itself.

The flange can rotate around the stub end, making bolt-hole alignment easier during installation.

How Does a Lap Joint Flange Work?

The stub end is welded to the pipe. The lap joint flange is then placed over the stub end.

During installation, the flange can rotate freely around the pipe, allowing the bolt holes to be aligned more easily.

Main Advantages

One of the biggest advantages of a lap joint flange is easy alignment.

Other benefits include:

• Easy installation
• Convenient maintenance
• Reduced alignment problems
• Suitable for frequent dismantling

Where Are Lap Joint Flanges Used?

They are commonly used in:

• Chemical processing
• Food processing
• Water treatment
• Pharmaceutical systems
• Corrosive service applications

Lap joint systems can also be economical when expensive corrosion-resistant materials are required because the flange and stub end may use different materials.

Material Options

Lap joint flanges are available in:

• Carbon steel
• Stainless steel
• Alloy steel
• Duplex stainless steel

As a professional China steel flange manufacturer, we supply lap joint flanges and stub ends in different sizes, pressure ratings, materials, and standards for international industrial projects.