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This paper introduces a multi-way block for large-diameter pipeline connectors designed based on Hubbed slip-on-welding steel pipe flanges, which solves the problems of complicated processing technology, poor mechanical properties, and short service life of existing welded multi-way pipe joints. The structural analysis and comparison of multi-way blocks and multi-way pipe joints under different working conditions are carried out. This paper adopts certain assumptions to simplify the model, analyzes the multi-way block and multi-way pipe joint in theory, and takes the PN16-150 multi-way block as an example to refine and verify the theoretical analysis results. In this paper, Pro-E is used to establish a three-dimensional model, and ANSYS workbench is used for structural static simulation. The simulation results show that the multi-way block has better mechanical properties than the multi-way pipe joint under the same working conditions, and the multi-way block after reducing the diameter has better mechanical properties than the equal-diameter multi-way block.

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The influence of support parameters on the parametric resonance of fluid conveying pipeline under pulsating flow excitation is studied. Firstly, the mathematical model of fluid conveying pipeline and support system is established, Then the Galerkin method is used for discretization, and the incremental harmonic balance method is used to solve the problem. The effects of support stiffness, support damping, support position, support number and support spacing on the boundary of parametric resonance region and the parametric resonance response are discussed. The results show that under the fixed pulsating amplitude, the pulsating frequency range of system instability becomes smaller with the increase of support stiffness, support damping and the number of support, while the support position and support spacing have less influence on it. The change of support stiffness and support position has little influence on the pulsation frequency that the parametric resonance lasts to the end, but the increase of brace damping makes its value decrease obviously. The research results can provide a theoretical basis for the design and installation of pipeline support system.

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