Stress calculation of gas turbine pipelines: junction at the sliding point between the unit’s inlet pipeline and the customer’s pipeline

When using AUTOPIPE or C2 software to calculate the stresses in gas turbine pipelines, the key to simulating the junction between the unit’s intake pipeline and the customer’s pipeline at the sliding point is to accurately represent the displacement and stress conditions at that junction. Here are the general steps and suggestions: 1. **Define the properties of the sliding point**: First, it is necessary to define a special node in the software to simulate the sliding point. This node should be able to simulate the displacement and rotation of pipes in reality due to changes in temperature and pressure, without applying additional restraining forces on the connected pipes. 2. **Enter displacement and force data**: The displacement and force data provided by the user must be accurately entered into the model. In AUTOPIPE, the displacement and force conditions of nodes can be set through Boundary Conditions. In C2 software, there are similar functions for defining the constraints and loads of nodes. 3. **Simulated sliding support**: In actual pipeline systems, sliding points are usually achieved through sliding supports. In software, this can be simulated by selecting the appropriate type of support, such as sliding or rolling support, which allows displacement in certain directions while imposing constraints in other directions. 4. **Consider the effects of temperature and pressure**: In addition to direct forces and displacements, changes in temperature and internal pressure can also affect pipeline stress. Ensure that the model takes into account the effects of temperature and pressure loads, which can be set according to actual operating conditions. 5. **Perform simulation and analysis**: After setting all the necessary conditions and loads, the simulation can be run to analyze the stresses and displacements of the sliding point and the pipes in its vicinity. Based on the analysis results, adjustments may be necessary to the pipeline design to ensure compliance with safety and operational standards. 6. **Result Verification**: Finally, it is important to verify the accuracy of the simulation results by using actual measurement data or by comparing them with theoretical calculations. The specific circumstances of each project may vary; therefore, when conducting simulations, it is necessary to adjust the aforementioned steps according to the actual design requirements and operating conditions. If there are specific displacement and force data, it is possible to discuss in more detail how to set them up in the software. .

You’re welcome! Feel free to ask me if you have any other questions. .

2. **Enter displacement and force data**: The displacement and force data provided by the user must be accurately entered into the model. In AUTOPIPE, the displacement and force conditions of nodes can be set through Boundary Conditions. In C2 software, there are similar functions for defining the constraints and loads of nodes. ———————————————— The sliding point achieves thermal displacement in a predetermined direction by setting constraint conditions (guidance or axis limitation). What is the difference between this approach and setting boundary conditions by using fixed-point input thermal displacement?

By setting guide or axial limits to enable the sliding point to undergo thermal displacement in a predetermined direction, it is possible to simulate actual pipe supports or connectors that allow the pipe to expand and contract freely in one direction while restricting its movement in other directions. This approach mainly simulates the physical behavior and constraints of pipes. The method of directly applying a thermal displacement at a fixed point involves manually applying a thermal displacement load at a fixed constraint point. It is a simplified assumption used to directly simulate the expansion and contraction of pipes due to temperature changes, rather than simulating the supports or connectors of the pipes. The main difference between the two methods is as follows: 1. **Reality of simulation**: Setting guide or axial limits closer to those of an actual pipe support system allows for a more accurate representation of the behavior of the pipes under operating conditions. 2. **Engineering applications**: Inputting the thermal displacement of fixed points is more suitable for simplified analyses or when detailed knowledge of the pipeline support system is not available. When performing stress analysis, the choice of method depends on the purpose of the analysis, the required accuracy, and the available detailed design information. Generally, if the specific details supporting this are available, it is recommended to use setup guidance or axial restraint for simulation, as this allows for a more accurate prediction of the stress and displacement conditions of the pipeline under actual operating conditions. .