The two ends of a horizontally laid straight thermal pipe are fixed. Which parameters does the axial thrust at these two fixing points depend on?
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This post was last edited by 1.6 on 2022-5-11 at 16:09. The horizontal straight heat transfer tubes are fixed at both ends; what parameters are related to the axial thrust at these two fixing points? (The process parameters such as medium, temperature, and pressure remain constant.) 1. Is it related to the length of the horizontal straight pipe? Why? 2. Will adding more fixing brackets in between the two end fixing brackets affect the axial thrust of those end fixing brackets? Does the intermediate fixing frame have any axial thrust? Background: Yesterday, while performing calculations using C2, I came across a section of 20# pipe at 150℃ and with dimensions of Φ108*4. With fixed supports at both ends, the thrust of the fixed supports remains 52.7 t when the length of the pipe in between is 600 mm, 6000 mm, or 60000 mm. After adding several additional fixed supports in the middle of the 60,000 mm pipeline, the thrust at both ends remains 52.7 tons, while the horizontal thrust from the additional fixed supports in the middle is 0. I can’t figure out why, so I’m asking on this forum
I don’t understand what is being tried to convey. First of all, why do horizontal heat pipes need to be fixed at both ends? What should be done regarding pipe thermal expansion if it’s fixed? What does perseverance have to do with sticking to a topic? Then what’s the purpose of all those brackets? First of all, since it’s a thermal pipeline, shouldn’t you consider thermal compensation? Shouldn’t you think about using expansion joints or Π-bends to address the effects of thermal expansion? Is the magnitude of the axial thrust what determines the selection of the pipe rack? ? ? Returning to the question, Question 1: Assume that the heat absorption effect on a one-meter-long pipe is x. For 10 meters, it’s 10x – how could there be no impact? Second question: the purpose of the fixing frame goes without saying; since it’s fixed in place, thermal expansion is confined to that area. But this doesn’t eliminate the effect, as the force remains present. So there’s no need for further explanation. The stress calculation in thermal pipelines is based on the fact that high temperatures cause thermal expansion of the pipes, and it has nothing to do with the pressure of the medium. Whether the pressure is constant or not doesn’t matter either; proper compensation is all that’s needed. I still don’t understand what exactly the problem is. If possible, could you clarify it so that we can discuss it together?
Thank you for the reply! Thermal pipelines must definitely have Π bends.
Yesterday, while performing calculations using C2, I came across a 20# pipe with a temperature of 150℃ and dimensions of Φ108*4. With fixed supports at both ends, the thrust of the fixed supports remains 52.7 t when the length of the pipe in between is 600 mm, 6000 mm, or 60000 mm. After adding several additional support brackets in the middle of the 60,000 mm pipeline, the thrust exerted by the support brackets at both ends remains 52.7 tons, while the horizontal thrust exerted by the brackets added in the middle is 0. I can’t figure out why, so I’m asking on this forum – a beginner in water supply piping
What the hell? 52.7 tons? ? ? ?
I haven’t used C2 properly, so I don’t understand it very well; I’m not clear as to why there’s a 0. What happens after it runs?