Stress and Pressure Pulsation Analysis of Low Temperature Compressor Piping System in LNG Vaporizing Station

Baoqing Wang, Zhi Zhang, Kun Huang, Yaotong Zhang, Zhenwu Zhang, Hui Gao and Lingdi Fu
Additional contact information
Baoqing Wang: Sinopec Tianjin LNG Co., Ltd., Tianjin 300457, China
Zhi Zhang: Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China
Kun Huang: Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China
Yaotong Zhang: Sinopec Tianjin LNG Co., Ltd., Tianjin 300457, China
Zhenwu Zhang: Anhui Province Natural Gas Development Co., Ltd., Hefei 230051, China
Hui Gao: Sinopec Tianjin LNG Co., Ltd., Tianjin 300457, China
Lingdi Fu: Environment and Technology Supervision Research Institute, PetroChina Southwest Oil & Gasfield Company, Chengdu 610041, China

Energies, 2022, vol. 15, issue 5, 1-21

Abstract: LNG (Liquefied Natural Gas) vaporizing stations are usually built in the cities and towns, and the BOG (Boiled Off Gas) pressurizing system is a very important element. In the pressurizing system, the severe vibration of the low-temperature reciprocating compressor may lead to a failure of the pipeline system and the equipment. Therefore, this paper analyzes the stress and pressure pulsation of the BOG compressor piping system in the LNG vaporizing station. The beam model was used to establish the pipe model. The static, harmonic and modal analysis were carried out based on the plane-wave theory and the pressure-fluctuation theory, and the influence factors of support spacing, the settlement of the fulcrum foundation, pipe pressure and elbow angle were analyzed. The main conclusions are as follows: (1) the unbalanced excited force caused by pressure pulsation greatly affects the stress of the exhaust pipe and compressor outlet pipe, and has less influence on the stress of the suction pipe and compressor inlet pipe; (2) although unbalanced excited force is generated in the elbow, it also has an impact on the straight pipe stress; (3) adding an expansion joint to the pipe of the BOG compressor can effectively reduce the stress of the pipe its the displacement, and can increase the flexibility of the pipe.

Keywords: LNG vaporizing station; low temperature compressor; piping system; stress analysis; modal analysis; pressure pulsation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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