大温差对油气管道卡压式连接器O形圈密封性能的影响模拟  

Simulation of the Influence of Large Temperature Differences on the Sealing Performance of O-rings of the Oil and Gas Pipeline’s Jam-on Connectors

作　　者：王建峰 叶思莹 WANG Jian-feng;YE Si-ying(Jiangxisheng Ganhua Safety Technology Co.,Ltd.)

机构地区：[1]江西省赣华安全科技有限公司

出　　处：《化工机械》2024年第6期828-834,共7页Chemical Engineering & Machinery

摘　　要：研究大温差对油气管道卡压式连接器O形圈密封性能的影响。设计包含试验缸与传感器的O形圈密封性能试验台,利用试验台模拟试验环境,研究待测O形圈在大温差条件下的泄漏率、应力松弛和抗渗性。模拟结果显示:温度在-60~0℃时,O形圈泄漏率控制在0.009%以下;温度在30~120℃时,O形圈泄漏率最高可达0.039%,说明低温条件下O形圈泄漏风险低于高温条件下,即低温条件下的密封性能优于高温条件下。当温度为-60℃时,O形圈应力松弛速度较低;当温度提升至室温(18℃)再提升至120℃时,O形圈应力松弛速度呈现一定程度的提升,说明温度提升将导致O形圈最终应力下降,造成O形圈泄漏率提升,密封性能下降。温度在-60~0℃时,O形圈封装内部油质液体pH值不变;当温度达到120℃时,油质液体pH值显著下降,说明温度越高,O形圈抗渗性越差,密封性能越差。The effect of large temperature differences on the sealing performance of jam-on connector's O-rings in the oil and gas pipeline was studied;including having a test bed designed for the O-ring sealing performance;test cylinder and the sensor so as to simulate test environment and investigate leakage rate;stress relaxation and impermeability of the O-rings to be tested with large temperature differences.The sim-ulation results show that;the O-ring's leakage rate is less than 0.009%when the temperature ranges from-60℃to 0℃.When the temperature stays between 30℃and 120℃;the O-ring's leakage rate can reach up to 0.039%;which indicates that leakage risk of the O-rings with low temperature is lower than that un-der high temperature;that is;the sealing performance at low temperature outperforms that under high tem-perature.As for the temperature of-60℃;the O-ring's stress relaxation speed becomes low.When the temperature rises to room temperature(18℃)and then reaches 120℃;the O-ring's stress relaxation speed increases to a certain extent;indicating that the increase in temperature will lead to a decrease in the final stress of the O-ring;which resulting in an increase in the O-ring's leakage rate and a decrease in the seal-ing performance.Regarding a temperature between-60℃and 0℃;the pH value of the oily liquid inside the O-ring package keeps unchanged.When the temperature reaches 120℃;the pH value of the oily liquid decreases significantly;which indicating that the higher temperature will result in both worse impermeabili-ty and sealing performance of the O-ring.

关 键 词：油气管道 O形圈 大温差 密封性能 泄漏率 应力松弛 

分 类 号：TQ055.81[化学工程]