Table of content
Introduction
When to use flange connection and when to use mechanical connection in pipeline is a choice that engineers need to make based on actual conditions. Flange connection is often used above the ground. Mechanical connection is usually used where thrust restraint is required. More detailed differences will be introduced in this article.
What is the main difference between flanged joints and mechanical joints?
Flange joints use flanges and bolts to connect pipes with high sealing performance. Mechanical joints use a combination of bolts, rubber gaskets and other components to form a tight seal, allowing a certain degree of deflection in the joint when connected while maintaining a seal under pressure.
How to choose between flanged and mechanical joints?
The choice depends on the size, pressure and space constraints of the system. Flange fittings are best suited for large, high-pressure systems, while mechanical fittings are often used for less pressure systems or underground connections. Mechanical fittings are available as either non-restrained or restrained fittings, using a wedge action to retain the gland. The compression of the gland against the bell wedges the gasket, creating a watertight seal.
What are the advantages of flanged joints?
- Withstands high pressure and can be used for pipe connections in high-pressure environments
- Strong sealing performance, bolts and gaskets can make the flange connection more sealed.
- Easy to disassemble, flange connection is more convenient when maintenance or pipe extension is required.
- Corrosion resistance
When should you use a mechanical joint?
Mechanical joints can be used in pipelines with low pressure requirements and underground applications.
Mechanical joints can be used in pipelines with limited installation areas or when quick installation and replacement are required.
Mechanical joints can be used in pipelines where frequent disassembly and replacement are required.
Which joint is better for high-pressure applications?
Flange fittings are more suitable for high pressure applications because they are more leak-tight and can withstand greater pressures.
What are the limitations of mechanical joints?
- Low pressure resistance
- Not suitable for large diameter pipes
- Low repair and replacement of mechanical joints
Summary
The choice of using a mechanical joint or flange depends on customer specifications, project requirements, and application. Engineers should carefully consider the advantages and disadvantages of each connection type before installation. Understanding the specific needs of your system will help you select the correct type of joint.
