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| Flow State of Natural Gas Pipeline Buried in the Undulating Terrain during Pigging |
| Received:March 27, 2019 Revised:June 12, 2019 |
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| DOI：10.7643/issn.1672-9242.2020.04.019 |
| KeyWord:natural gas pipeline undulating terrain pig flow state in pipeline accumulated liquid |
| Author | Institution |
| XIE Hong-wei |
Guangxi Natural Gas Pipeline Co., Ltd, Beihai , China |
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| Abstract: |
| The work aims to clarify the change of flow pattern in the natural gas pigging process and propose the pigging time according to the amount of liquid accumulated based on the change of the flow state in the natural gas pipeline buried in the undulating terrain during pigging. The change process of the flow state parameters during pigging was revealed through OLGA software, and the corresponding pigging cycle was proposed. The pig running in the ascending pipe made the pressure and temperature at entrance increase slightly, while its velocity increased rapidly when the pig crossed the high point, causing the pressure and temperature at entrance to decrease rapidly. When the pig reached the lowest point, the amount of liquid accumulated in front of the pig was up to the peak. At the same time, the discharge rate of liquid at exit increased exponentially with the running time of the pig and the total volume of outflowing liquid was 333m3through integral computation, which was consistent with the actual results. For natural gas pipelines, the gas phase flow rate, followed by undulation Angle and liquid phase flow rate, was the most important factor affecting the amount of liquid accumulated in the pipeline. The amount of accumulated liquid in the natural gas pipeline reaches the maximum after the stable operation of pigged natural gas for 60 days. Therefore, it is recommended to conduct pigging when the amount of accumulated liquid is 100m3 within 20 days, and the volume margin of the designed end container is 1.2. |
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