A105 BLANKLE BL FLANGEPrecautions for use

1.A105 BLIND BL FLANGE A common main square for connecting instruments with process equipment and piping. Due to the large number of blue, law, standards, complex sealing surface forms, diverse pressure and temperature levels, and various types of steel materials, the reasonable application of flanges is more difficult. The French and Lan standards used in the instruments and equipment imported from abroad are both foreign standards, which further increases the complexity of the application of French and Lan. In order to compile a comprehensive list of materials, automatic control designers often spend a lot of time reading and comparing the standards of law and blue, looking for alternative products of law and China. Nevertheless, it is inevitable that some errors will occur, and the wrong temperature and pressure level will cause problems in principle. When installing the instrument, the law, the blue, there is no law match, resulting in waste. Therefore, the correct choice of flange is a necessary link in the selection of various instruments.

To choose and apply correctly and reasonablyA105 BLANKLE BL FLANGE, It is necessary to grasp several key aspects, namely, the flange standard, the flange standard number, the corresponding relationship between temperature and pressure, and the comparison of materials in different countries, in order to get twice the result with half the effort.

2. Standards and specifications for BL flange of A105 blind plate:

The main application in China is the chemical industry standards of Fa and Lan. The standard is divided into two systems (the European system and the Inter-American system), Rand, Fa and Rand, with different standard numbers. Although they are both chemical standards, they are not interchangeable. To avoid errors, it is necessary to clearly mark the mercury flange standard number.

　　3.A105 BLANKLE BL FLANGEInstallation commonality:

If different standards from different countries are used, the standard number of the blue law should also be clearly indicated. In fact, after careful comparison, the various standards are different. Some standards, such as the chemical industry flange European system and flange, under the same DN, when the DN is less than 100mm, its outer diameter, number of threaded holes and size are the same as the flange, so it can be widely used in the automatic control profession. If the project pressure level is pressure level 1.6 MPa, the instrument pressure level is pressure level 2. 0 MPa, if the HG 20592-97 European system is used, as long as the withstand voltage level allows, it can be completely matched. The general parameters of flanges under ordinary pressure levels need to consult the relevant literature.

4. Chemical A105 blind plate BL flange standard American system

After careful comparison, the chemical industry flange standard American system is not universal at pressure levels below 5.0 MPa, which is different from the European system and should be paid attention to in application.

　　5.A105 BLANKLE BL FLANGETemperature Considerations

Various standards of flanges have different withstand voltages at different temperatures, so they cannot be matched casually. In ANSI-150, if the pressure is equivalent to 4.448 N/square inch = 6.89 5千帕 (lbf = 0.4536 kgf), it is 667. 2 Newton/square inch = 1.034 MPa (150 lbf), but different standards have different pressure resistance at different temperatures. Suitable for flanges of different standards, such as mercury, JIS, American National Standards Institute, German National Standards Institute, etc. We should not only use the pressure to correspond, but also consider the temperature level. Even if the same material has different pressure resistance at different temperatures, please refer to Resources for details.

6.A105 BLIND BL FLANGE MATERIAL-RELATED PROBLEMS

For the same standard flange, different materials have different withstand voltages at different temperatures. The relationship between temperature, material and pressure resistance in HG 20604-97 standard. As there are many kinds of steel in the world, the commonly used steel grades in the literature are grouped according to their characteristics, in which the nominal pressure grade belongs to the flange of the European system, and the material group number is 1.0-14. 0 (11 grades in total); the nominal pressure level belongs to the flange of the American system, and the material group number is 1. 02.4 (12 grades in total). The same standard number under the same temperature conditions. If the number of material groups is different, the pressure resistance (high impact pressure resistance) of the flange is also different.

　　7.A105 BLANKLE BL FLANGEConcluding remarks

a) The flange standard for automatic control shall be determined according to the process characteristics. Due to the different flange withstand voltages of different standards, temperatures and materials, the automatic control profession should select flange standards and flange standards according to the decision of the process profession.

At present, the interface flange of some instruments can have various specifications. The automatic control designer can make suggestions to the instrument factory according to the flange standard and the scale of the process specialty. Special attention should be paid to the correspondence between various materials, pressure levels and temperatures.A105 BLANKLE BL FLANGE

c) If the flanges of some instruments are rarely used and cannot be matched with the flanges of process equipment or pipelines, the instrument factory may be required to provide flanges matched with the instruments at the same time if the material, temperature and pressure requirements are met. Of course, the price of the matching flange may be relatively expensive.