Classification and application of flange

The classification of flange
1 to classified material of carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy.
2 in order to production methods can be divided into the flanges forging, casting flange, welded flange etc..
3 to create criteria can be divided into the national standard (GB) (Ministry of chemical industry, petroleum, electric power standard standard standard), American Standard (ASTM), German standard (DIN), Japanese standard (JB) etc..
Steel pipe flanges Chinese national standard system GB
Nominal pressure 1 flange: 0.25Mpa-42.0Mpa
Series 1:PN1.0, PN1.6, PN2.0, PN5.0, PN10.0, PN15.0, PN25.0, PN42 (main series)
Series 2:PN0.25, PN0.6, PN2.5, PN4.0
The structure form of the 2 flange:
A PL, flat welding flange;
B, flat belt neck SO;
C, WN on welding flange;
D, socket weld flange SW;
E, loose flange PJ/SE
F, the whole tube IF;
G Th, threaded flange;
H BL, the cover flange, flange cover lining BL (S).
3 flange seal type: flat FF, sudden surface RF, FM, MF, concave convex groove TG, ring joint face RJ
The application of flange
Flat steel flange: suitable for carbon steel pipe for the nominal pressure of not more than 2.5Mpa connection. Flat welding flange sealing surface can be made smooth, bump and tenon slot three. Flat welding flange smooth application of the largest, and more for the mild medium conditions, such as low non clean air, low pressure circulating water, it has the advantage of cheaper prices.
Butt welding steel flanges for the corresponding flange and pipe welding, reasonable structure, strength and stiffness is bigger, can withstand the high temperature and high pressure and repeated bending and temperature fluctuations, reliable sealing. Nominal pressure 0.25-2.5Mpa on welding flange sealing surface with concave convex type.
Socket welding flange: commonly used in PN is less than or equal to 10.0Mpa, DN is less than or equal to 40 of the pipeline;
Loose flange: loose flange commonly known as loose flange, welded ring loose flange, flanging looper flange and butt loose flange. Commonly used in the medium temperature and pressure are not high and medium corrosive condition. When the corrosive medium, the flange contact with the medium part (flanging for short) corrosion resistant high grade materials such as stainless steel material, and the external is the use of inferior materials such as carbon steel flange ring clamp it in order to achieve sealing;
Integral flange: often the flanges and equipment, pipes, valves are made into a whole, this type of equipment and valves are commonly used in.