Low-temperature U-type heat exchanger
Thread Content
This post was last edited by 370228683 on 2012-5-28 08:33. For a U-type heat exchanger, the design temperature for its shell side is -20°C, and the design drawings specify that it should be manufactured in accordance with the GB151-1999 standard. Does this mean that the equipment must be manufactured in line with the requirements of Appendix A of GB151-1999 (low-temperature shell-and-tube heat exchangers)? If the design temperature on either the tube side or the shell side is -20°C, does that mean the entire equipment qualifies as a low-temperature shell and tube heat exchanger?
For austenitic stainless steel, there is no need to apply it, and it is also not required in conditions of low temperature and low stress
The following are merely personal opinions: 1. First, consider whether, under these operating conditions, it is possible to achieve low temperature and low stress conditions; if so, there is no need to manufacture the device as a low-temperature container. 2. Does this equipment have insulation measures? If it does, the design temperature should be determined based on the actual operating temperature; for details, refer to the relevant sections of HG20585. 3. Regarding material selection: if materials resistant to low temperatures are used, then none of the issues mentioned above need to be considered. These are just personal opinions; experts are welcome to provide their feedback
The design temperature on either the tube side or the shell side is -20°C (of course, several special cases specified in Appendix A of GB151-1999 are excluded). The equipment belongs to the category of low-temperature shell-and-tube heat exchangers; however, design, manufacturing, and inspection requirements for the tube side and the shell side must be specified separately depending on whether they are operating under low-temperature conditions, which is similar to the classification method used for such equipment.