Pipe box flange
Thread Content
1. The pipe and shell side pressures are 1.6 and 1.0 respectively. When selecting the connection method between the A-type tube plate, the pipe box cylinder and the shell side cylinder, the pipe box flange and the cylinder flange should have the same pressure level, right? 2. If the steel pipe is used as the barrel of the shell, can pipe flanges be used for the pipe box flange and the shell flange? What should I do if SW6 fails to pass the verification after selection? Can we only design non-standard ones?
1. The pipe box flange and the cylinder flange should be selected according to their respective pressure levels, but the flanges connecting the pipe box and the cylinder should be the same. If they are different, the two will not be connected. 2. You can choose a standard pipe flange and check the flange standard. As long as the maximum non-impact working pressure at the corresponding temperature can meet the requirements. Whether it is a pipe flange or an equipment flange, it can be used as long as it meets the standard requirements. Generally, it fails the SW6 check, but it can be used.
1. When selecting equipment flanges for the pipe and shell side, they should be selected according to the same level of pressure and should also be selected according to the higher pressure level. In addition, the author noted that when the pipe side pressure is greater than the shell side pressure, in order to check the tightness of the connection between the pipe and the tube sheet, the shell side test pressure should be considered according to the following methods and needs to be clearly specified: ①: Increase the shell side test pressure to equal the tube side test pressure. ②: If the above method cannot be used after calculation, or is unreasonable from technical and economic considerations, after the shell side and pipe side are tested according to their respective required pressures, the shell side should conduct an ammonia leakage test with reference to Appendix A of HG20584-19988 "Ammonia Penetration Test Method for Pressure Vessels". 2. Of course, if the steel pipe is used as the shell, the pipe flange can be used as the equipment flange, but it must be calculated and passed by SW6. It does not need to be calculated if it is standard. During calculation, if the bolt spacing is greater than the maximum bolt spacing, it will not affect the flange calculation as long as the strength is met. Of course, special circumstances require non-standard designs.
Agree with the point above. Although the pipe flange used is also a standard part, it is not a container flange. Strictly speaking, it still needs to be calculated, but we all use it directly.