classification of forged flanges and usage

The classification of flanges 

1. The material is divided into carbon steel, alloy steel, stainless steel etc

2. According to manufacture standard, flanges can be divided into GB, ASTM, DIN, JIS, EN and so on. 

3.There are many different type of flanges, such as weld neck, threaded, socket weld, blind, lap joint, loose, plate etc.

4. Flange sealing surface type:raised face(RF) flat face(FF) ring type joint (RTJ)

About flange application

Smooth flat welding flange the largest number of applications, and more for medium conditions more modest circumstances, such as low pressure non-purified compressed air, low pressure circulating water, which has the advantage of cheaper prices.

Butt Weld Flange is used for the counter welding of flange and pipe. Its structure is reasonable, its strength and degree of steel are large, it can withstand high temperature and high pressure, repeated bending and temperature fluctuation, and its sealing is reliable. 

Socket welding flange: commonly used in the pipeline pn ≤ 10.0mpa, dn ≤ 40; 

Loose flanges: Loose flanges commonly known as looper flanges, looped flanges, flanging flanges and flanges

Welded live sleeve flange. Commonly used in medium temperature and pressure are not high and medium corrosive strong situation. When the medium is corrosive, the part of the flange that contacts the medium (flanging section) is made of a corrosion-resistant, high-grade material, such as stainless steel, while the outside is clamped with a flange ring of a lower material, such as carbon steel In order to achieve the seal