How are pipes and flanges connected?

How are pipes and flanges connected?

Pipes and flanges can be connected together in three ways: welding connections, threaded connections and clamping connections.

1. Welding connection

Welding is a common method of joining pipes and flanges. When using welded connections, the flange and pipe connections need to be connected together through molten metal material. Welding connection methods are generally divided into two types: butt welding and seam welding.

Butt welding is to connect pipes and flanges together through butt joints and then weld them. This method has strong connection points and is suitable for pipes with larger diameters and high-pressure pipes.

Seam welding, on the contrary, presses the flange nozzle and the outer diameter of the pipe together through a gear hobbing machine or mechanical equipment, and then welds them. The seam welding connection method is more suitable for smaller diameter pipes because it can reduce the diameter and wall thickness of the pipe, thereby reducing the weight and cost of the pipe.

2. Threaded connection

Threaded connections are a way of connecting flanges and pipes together through threads. There are two types of threaded connections: internal threads and external threads. The internal threads are generally on the flange and the external threads are on the pipe.

This connection method is suitable for some low-pressure and unconventional equipment, such as low-pressure steam pipelines and liquid chemical transportation pipeline systems. The threaded connection is easy to operate when installing and disassembling, but it is not strong enough.

3. Clamping connection

A clamping connection is made by installing a clamping device between the flange and the pipe to firmly connect them together. This method is suitable for connecting some elastic pipes and used in high temperature and high pressure environments. Clamped connections are flexible and easy to disassemble and maintain, but they are also prone to leaks.

Conclusion:

Pipes and flanges can be connected together in three ways: welding connection, threaded connection and clamping connection. Each connection method is suitable for different scenarios. When selecting a connection method, comprehensive considerations need to be made based on the diameter, pressure, temperature and other parameters of the pipe to ensure safety and reliability.

Go here to learn more: Stainless steel pipe fittings or Pipe flange size type and selection