Splicing of U-tubes (how to interpret Clause 8.3.4 of GB/T151-2014)

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This post was last edited by Morning glory_FANR_JHQY on 2018-7-21 at 10:40. I would like to ask everyone how to understand Clause 8.3.4 of GB/T151-2014: The original text of Clause 8.3.4 states that when the length of the straight section of the heat exchange tube is greater than 6000 mm, it is permissible to splice such tubes, and they must meet the following requirements (the specific requirements are not listed here). My question is, how to understand \"the length of the straight pipe section is greater than 6000 mm\". ““The length of straight tubes should be greater than 6000 mm.” This is easy to understand: for straight heat exchange tubes, when their length exceeds 6 meters, it is allowed to join them together (with one joint permitted). This is probably because the tubes that are commonly available on the market have a length of 6 meters; therefore, heat exchange tubes longer than 6 meters can be joined using one joint. And does “the length of the straight section is greater than 6000 mm” mean that the length of the straight section on one side of the U-shaped tube is greater than 6000 mm? If that’s the case, then can’t U-tubes with many straight sections of 6000 mm or less each, but a total length of the U-tube exceeding 6000 mm, be joined together? Or can it be understood that splicing is allowed when the sum of the lengths of the straight sections on both sides of the U-tube is greater than 6000 mm? For example, in the heat exchanger I’m dealing with now, the straight section on one side of each U-tube is exactly 6000 mm long, while the total length of each U-tube exceeds 12.8 meters (nearly 13 meters). I would like to ask: according to GB/T151-2014, is it permissible to join such U-tubes together?