Determine whether the pipeline flexibility is sufficient?
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There are the following questions: Dear experts on this forum, how should I calculate this? There are only 2 fixed points, and it’s not a straight pipeline; surely flexibility is sufficient, right? But the question is asking whether it’s sufficient or not, and I’m a bit at a loss here. I would appreciate it if someone could give me some guidance; I don’t know much about this topic. Even after looking at SH/T 3041 and GB 50316, I still didn’t understand it, so I’m coming to ask for help. Thank you in advance!
Is there anyone here who can give some hints? Thanks
What kind of test question is this? It’s not very rigorous at all. What does it mean for flexibility to be sufficient? Flexible computing generally requires computing software. If you want to experience the pleasure of manual calculation, refer to DL/T 5366-2014.
Well, I also think the question is problematic； They are questions from the pressure pipeline design review training. Thank you, then I’ll go and experience the joy of manual calculation:D
Your question is exactly the same as the example in my table; P
But this formula is used to determine whether a formal flexibility analysis of the pipeline is necessary: ASME B31.3: Translation version: I’m not sure whether a failure to meet the requirements indicated by this formula means that the flexibility is insufficient I’ve just started working with this, so I’m not yet ready to make any judgments:$
This post was last edited by lupg on 2020-1-24 at 09:31. 1. To address the poster’s doubts, it is first necessary to understand the criteria for determining flexibility, and these criteria can be found in the formula provided by the user in post 6. 2. In the formula given by that user, there is a value of 208; understanding the meaning of this value helps one grasp the key aspects related to flexibility. 3. The origin of the value 208 is Sa (the stress range corresponding to displacement) divided by Ea (the elastic modulus of the material), which shows that it is related to stress. 4. In simpler terms: if a pipe deforms due to external factors such as thermal deformation, causing local areas to experience stresses exceeding the allowable limits, the pipe’s safety level drops below acceptable levels. In such cases, it can be said that the pipe lacks sufficient flexibility, and it is necessary to adjust its layout in order to increase its flexibility and reduce the stresses. 5. Therefore, the question posed by the original poster involves a simple mathematical calculation; the result of this calculation is then evaluated using the criterion provided by the friend in post 6 to determine whether it meets the flexibility requirements. 6. Adjusting flexibility is a technical task, and the original poster did not ask how to do it, so it will not be discussed here. 7. The two accompanying diagrams are rough sketches of the stress distribution created in haste using two different software; they show a schematic of the thermal stress distribution based on the dimensions of the pipes in the building, with high stress levels indicated in red.
Thank you for providing such detailed answers; I now have a general understanding, and I’ll study it further: lol