For DN1600 pipes supported by saddles, how should the supports be entered when modeling in CⅡ?
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Hello everyone, I have a question: for DN1600 pipes that are supported by saddles, when modeling in CⅡ, should the support conditions such as +Y be entered at just one point as well? Should it still be defined in some special way? I’m wondering that with saddle support, it’s the entire length of the pipe that is supported, rather than just a single point. I’m not sure if I’m overcomplicating things; I hope the experts here can give me some advice! ! !
Pipes this large are no longer suitable for calculation using C2
Yeah, I attended some training before, and the instructor also said that for large-diameter components, C2 is not allowed; instead, ANSYS should be used for analyzing the bends in those components. So if C2 is not used, what software or methods can be used to perform stress analysis on such large-diameter pipes?
For such large pipes, should they be buried or placed above ground? If the load is high, it would be advisable to consider adding supports inside the pipes.
It depends on what conclusion you want to draw. If it’s about local stress values, it is recommended to use ANSYS for analysis of the individual pipe fittings, while C2 can be used to calculate the overall stress conditions of the piping system. Regarding support, you need to consider whether the support point can rotate; you can simulate 4 to 6 support points to replace the support provided by the bottom plate of the saddle.
It’s on the ground – what does it mean by having internal supports? Could you be more specific?
It mainly depends on the piping system, but the instructor in the training I attended said that C2 yields inaccurate calculation values for large-diameter pipes, as these values tend to be too high. Also, does the support you mentioned rotate, and what does it mean to simulate 4 to 6 supports? Could you explain the specific points? Thank you!
The C2 calculation is indeed inaccurate for pipes with large diameters; this depends on the ratio of wall thickness to diameter. When the wall thickness is too thin, the pipe cross-section is not an ideal circle, allowing for a certain degree of irregularity. As a result, the overall stiffness of the pipe deviates from the theoretical value. Simulating 4 to 6 supports means treating the pipe support base plate as 4 to 6 pivot points, using a rigid component to model the bottom surface of the pipe support, and applying +Y constraints without applying any rotation constraints. You will find that the stress on the several support points you create is not uniform; some of them may even lift off, but the amount of displacement is very small. This simulates the actual stress conditions on the bottom surface of the tube support.
The pipe diameter is too large; if the medium is in a liquid state, such as water, then stress is concentrated at the support points, and the pipe may deform. If the pipe load is fine, it should be okay. For large-diameter pipes, it is essential to take them seriously.
Mm-hmm, I feel like there’s still a lot I don’t understand. Thank you for your guidance