International Grade Standards of Flange

Understanding the above five common flange grade standards and their characteristics, we can better select and apply flanges of different grades to meet the needs of different engineering projects. In practical applications, it is crucial to select the appropriate flange grade according to the specific engineering requirements and the parameters of the pipeline system, and it also helps to select the appropriate flange supplier.

Features of flange grade standards

1. The higher the standard grade, the stronger the pressure bearing capacity of the flange connection, but the corresponding production cost will also increase.

2. Different flange standard grades cannot be mixed and need to be connected according to flanges of the same standard grade.

3. Flanges of the same standard grade are suitable for pipeline systems of different pressure grades. For example, PN1.6MPa flanges are suitable for pipeline systems with nominal pressure grades of 1.0, 1.6 and 2.5MPa.

4. Different flange standards are suitable for different media and temperature ranges, and the appropriate flange standard grade needs to be selected according to specific working conditions.

Commonly used international flange grade standards

1. ANSI B16.5

ANSI B16.5 is the American national standard for flange connection. It is the same as ASME B16.5 and is the most widely used flange standard. ANSI B16.5 covers a pipe diameter range from 1/2 inch to 24 inches, grades from 150# to 2500#, and includes several different shapes of face seals.

2. JIS B2220

JIS B2220 is a flange connection standard formulated by Japan, with five grades of 10K, 16K, 20K, 30K, and 40K, of which 10K and 20K are the main grades. The sealing surface of the JIS B2220 flange surface adopts two types: flat type and flange type, which are suitable for different pressure grades.

3. DIN 2501

DIN 2501 is a German standard with five grades of PN6, PN10, PN16, PN25, and PN40. The flange connection surface of DIN 2501 adopts two shapes: circular surface and flange surface. The flange connection of the flange surface has higher sealing performance.

4. EN 1092

EN 1092 is a European joint standard, including five connection methods: type 1 (plate flange), type 2 (flange flange), type 5 (reverse cover flange), type 11 (blind cover flange) and type 12 (hinge flange). The flange connection surface of EN 1092 adopts two shapes: circular surface and flange surface, which can achieve standard interchangeability.

5. GB/T 9119

GB/T 9119 is a flange connection standard formulated by China, including 12 grades such as PN0.25, PN0.6, PN1.0, PN1.6, PN2.5, PN4.0, PN6.3, PN10.0, PN16.0, PN25.0, PN42.0, etc. The flange connection surface of GB/T 9119 standard adopts two shapes: flat type and flange type.

Application scenario

1. ANSI B16.5 flange is widely used in chemical, petroleum, electric power, papermaking, shipbuilding, water treatment and other industries and various pipeline systems. It is suitable for various pressures, temperatures and fluids.

2. JIS B2220 flange is suitable for low pressure and high temperature occasions, mainly used in pipeline systems in water treatment, chemical, mining, food processing and other fields.

3. DIN 2501 flange is mainly suitable for low and medium pressure pipeline systems in the fields of shipbuilding, chemical, food, pharmaceutical, electric power and other fields.

4. EN 1092 flange is widely used in pipeline systems in equipment, machines and various industrial buildings.

5. GB/T 9119 flange is widely used in pipeline systems in the fields of petroleum, chemical, metallurgy, electric power, water treatment and other fields.

Summary

The above introduction of common flange grade standards includes the international common flange standard grades and applicable scope. In the process of using flange connection, it is necessary to select the appropriate flange standard grade according to the specific working conditions to ensure the safety and reliability of the connection.