Determination of the slide structure in extractable tube bundles
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GB151-1999 specifies the structure of slides, including slide plates, rollers, and sliding strips. In practical applications, a slide plate structure is often used for the tube bundles of U-tube heat exchangers. However, when the tube bundle is heavy, using a slide plate structure may make it difficult to install or remove the tube bundle; in such cases, a roller structure is generally employed. The biggest drawback of the roller structure is its complex manufacturing process, which reduces the number of tubes that can be used； Sliding strips are generally used for the installation and removal of the tube bundles in kettle-type reboilers ； So, for the roller structure, at what weight of the tube bundle is it applicable (under what conditions should it be used to make the overall design of the equipment more reasonable)?
No one has replied, so I’ll answer instead. In our factory, the vast majority of heat exchangers have custom-designed structures, and large heat exchanger units (shell-and-tube type) utilize a roller-based structure. As far as I know, the maximum net weight of a tube bundle using a roller structure is 20 tons, with a diameter of 2400 mm and a total length of the tube assembly of 8 meters. On the other hand, the minimum net weight of a tube bundle using this structure is only 350 KG, with a diameter of 350 mm and a total length of 1 meter. For the design of many devices, we draw inspiration from the designs of a well-known global manufacturer of heat exchangers. I don’t think it’s important to determine exactly what weight limit is suitable for a roller structure; what matters most are the requirements of the operating environment. Of course, manufacturing considerations also need to be taken into account, but the operating environment is the key factor. In fact, a roller structure can also be designed to be quite simple; you can refer to my post at http://bbs.hcbbs.com/thread-437212-1-4.html
I’ve seen the structure of sliding strips before; surprisingly, the manufacturer used angle steel to assemble them, resulting in an uneven surface. . . To save material? ? ? It took us a tremendous amount of effort to install it! It’s very difficult to align the bolt holes on the tube sheet flanges. . . I don’t plan to use this manufacturer anymore. . . Sigh