Advantages and disadvantages of conventional flanges

Advantages and disadvantages of several common flanges

1. Plate type flat welding flange:

Advantages:

Easy to obtain materials, simple to manufacture, low cost, and widely used.

Disadvantages:

Due to its poor rigidity, it should not be used in chemical process piping systems with supply and demand, flammability, explosiveness, and high vacuum requirements, as well as in highly hazardous environments.

The sealing surface types include flat and protruding surfaces.

2. Flat welding flange with neck:

Neck welding flange belongs to the national standard flange system and is one of the manifestations of national standard flange (also known as GB flange). It is one of the commonly used flanges on equipment or pipelines.

Advantages:

On site installation is more convenient, and the process of welding and rubbing can be omitted.

Disadvantages:

The neck height of the flange with neck flat welding is lower, which improves the stiffness and load-bearing capacity of the flange. Compared with butt welded flanges, the welding workload is large, the consumption of welding rods is high, and it cannot withstand high temperature, high pressure, repeated bending, and temperature fluctuations.

3. Neck welding flange:

The sealing surface forms of neck welded flanges include:

RF, FM, M, T, G, FF.

Advantages:

The connection is not easily deformed, the sealing effect is good, and it is widely used. It is suitable for pipelines with large temperature or pressure fluctuations, high temperature, high pressure, and low temperature pipelines. It is also used for pipelines that transport expensive media, flammable and explosive media, and toxic gases.

Disadvantages:

The neck welded flange is bulky, heavy, expensive, and difficult to install and position, making it more prone to collision during transportation.