1. Grooved flanges are generally used in fire protection and water supply pipes.

Grooved flange: refers to a flange with a groove connected to the flange end face.

2. High-neck flanges are generally used in chemical pipelines with high temperature, high pressure, flammable and explosive, highly toxic, and high requirements for internal cleanliness of the pipeline.

High-neck flange: The neck height is higher, which improves the rigidity and 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, but it is more convenient to install on site, and the process of filming and flaw detection of welds can be omitted, which is more popular.