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[1]王炎兵 张宏 夏梦莹 周泓宇 李柏松 黄启玉 刘啸奔.LNG储罐进液管道应力状态计算及潜在失效风险识别[J].油气储运,2025,44(03):1-12.
WANG Yanbing,ZHANG Hong,XIA Mengying,et al.Stress State Calculation and Potential Failure Risk Identification of LNG Storage Tank Inlet Pipeline[J].Oil & Gas Storage and Transportation,2025,44(03):1-12.
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WANG Yanbing,ZHANG Hong,XIA Mengying,et al.Stress State Calculation and Potential Failure Risk Identification of LNG Storage Tank Inlet Pipeline[J].Oil & Gas Storage and Transportation,2025,44(03):1-12.
LNG储罐进液管道应力状态计算及潜在失效风险识别
《油气储运》[ISSN:1000-8241/CN:13-1093/TE]
卷:
44
期数:
2025年03期
页码:
1-12
栏目:
出版日期:
2025-03-25
- Title:
- Stress State Calculation and Potential Failure Risk Identification of LNG Storage Tank Inlet Pipeline
- Keywords:
- LNG terminal; inlet pipeline; temperature field; mechanical performance; stress calculation; failure risk identification
- 分类号:
- TE832
- 文献标志码:
- A
- 摘要:
- 【目的】进液管道作为LNG储罐的重要附属设施，在运行过程中管道的压力与温度变化大、分布不均匀，且进液管道受力状态复杂，预先识别管道潜在的失效风险有利于保障LNG储罐的安全运行。【方法】以某LNG接收站储罐进液管道为例，建立管道温度场数值计算模型，将管道的真实运行参数作为输入，计算管道在预冷、进液工况下的温度变化，获得LNG储罐罐顶进液管道环向及壁厚方向的温度分布。选取LNG储罐进液管道用304/304L不锈钢，对管材在常温与超低温环境下的拉伸性能、疲劳性能进行力学性能测试。结合管材特性测试结果，建立进液管道应力计算模型，将温度场模拟结果作为边界载荷条件，计算进液管道在不同运行工况下的应力状态。【结果】进液管道在预冷过程中环向存在不均匀的温度分布，管顶与管底的温差达到40 ℃，管道内外壁温差达到23 ℃；在进液初始时刻，管道环向温度均匀分布，内壁温度快速降至－160 ℃，内外壁温差超过50 ℃；在超低温环境下，管材的屈服强度、抗拉强度分别达到454 MPa、1 463 MPa；在0.8%的应变下，管材的失效循环次数在4 500次以下，低于LNG储罐设计寿命内预计进液次数。进液管道在正常服役工况下，因内压、温度等会导致管道结构发生变化，但产生的应力较小；若罐顶进液管道阀门存在内漏、较高的保冷温度，再叠加管道不满流运行产生的环向不均匀温度分布，会在管道底部内表面不等壁厚焊接位置产生超过材料屈服强度的轴向及环向应力，管道易发生裂纹失效风险。【结论】对于LNG储罐进液管道，运行过程中管道内外的巨大温差是影响管道应力的最主要因素之一，今后应从降低温差的角度优化运行工艺，排查安全风险，保障管道稳定、可靠运行。
- Abstract:
- [Objective] As an important ancillary facility of LNG storage tanks, the inlet pipeline experiences large and uneven pressure and temperature changes during operation. The pipeline is also subjected to the weight of valves and the pipeline itself, resulting in a complex stress state. Identifying potential failure risks of the inlet pipeline is of great significance for ensuring the safety of LNG storage tanks. [Methods] A numerical calculation model for the temperature field of a storage tank inlet pipeline at a certain LNG receiving station is established. The actual operating parameters of the pipeline are used as inputs to calculate the temperature changes of the pipeline under pre cooling and inlet conditions, and obtain the temperature distribution in the circumferential and wall thickness directions of the tank top inlet pipeline. Select 304/304L stainless steel for the LNG storage tank inlet pipeline, conduct mechanical performance tests on the inlet pipeline, and test the tensile and fatigue properties of the pipe material at room temperature and ultra-low temperature environments. Based on the test results of pipe characteristics, a stress calculation model for the inlet pipeline is established. The temperature field simulation results are used as the boundary load conditions for the model to calculate the stress state of the inlet pipeline under different operating conditions. [Results] There is an uneven temperature distribution in the circumferential direction of the pipeline during the pre cooling process, with a temperature difference of 40 ℃ between the top and bottom of the pipeline, and a temperature difference of 23 ℃ between the inner and outer walls of the pipeline; At the initial moment of liquid inlet, the temperature distribution around the pipeline is uniform, with the inner wall temperature rapidly decreasing to -160 ℃ and the temperature difference between the inner and outer walls exceeding 50 ℃; At ultra-low temperatures, the yield strength and tensile strength of 304/304L stainless steel reach 454 MPa and 1463 MPa, respectively; At a strain of 0.8%, the failure cycle of the pipe is less than 4500 times, which is lower than the expected number of liquid intakes during the design life of the LNG storage tank. Under normal service conditions, the inlet pipeline experiences structural changes due to internal pressure, temperature, and other factors, resulting in relatively low stress; If there is internal leakage and high insulation temperature in the valve of the liquid inlet pipeline at the top of the tank, combined with the uneven temperature distribution in the circumferential direction caused by the operation of the pipeline under non flowing conditions, axial and circumferential stresses exceeding the yield strength of the material will be generated at the welding position of the uneven wall thickness on the inner surface of the pipeline bottom, and there is a risk of crack failure in the pipeline [Conclusion] For LNG pipelines, the huge temperature difference generated inside the pipeline during process operation is one of the main factors affecting pipeline stress. Research should be conducted from the perspective of reducing temperature difference, optimizing operating processes, identifying safety risks, and ensuring safe operation of pipelines.
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更新日期/Last Update:
2025-02-11