Is there a problem with purging using a jacketed tube?
Thread Content
Is there a problem with purging using a jacketed tube? The inner tube contains high-temperature steam, while the outer tube holds cooling water, with the water temperature being kept below 60°C. Flanges are used to connect each section together (the maximum length is determined based on stress calculations). Guess the advantage is: overall pipeline thermal expansion **reduces** ； No insulation required ； The requirements for pipe racks will decrease significantly ； Easy to move and assemble. The disadvantages are: high cost, detailed stress analysis. Your insights are welcome! ! !
Based on your reasoning, all the advantages you mentioned are unfounded. 1. The thermal expansion of the pipe will not decrease, as the temperature of the inner pipe remains very high. This approach actually increases the stress between the inner and outer tubes, as the temperature difference is large, resulting in significant differences in their thermal expansion rates, which is a problem. 2. The cost of not having insulation is too high; simple insulation is sufficient to meet the requirements. 3. The requirements for pipe racks will increase, as each set of equipment is different; even if they are basically similar, the distances will certainly vary, making it impossible to simply apply the same solutions in all cases. 4. I’m not sure how this mobile assembly unit can be moved; it might be possible if it’s within the factory premises. In summary, you want to create a reusable purging pipeline. My suggestion is that for essentially the same device, a basically identical purging pipeline design can be used. The idea of using a jacketed tube is not feasible; flange connections work, allowing for simple insulation and reuse.
If each jacketed section is made into a concentric tube heat exchanger, will the thermal expansion be the same? In manufacturing, adding more fins to the inner tube improves the cooling effect