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
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.
oil and gas pipelineO-ringlarge temperature differencesealing performanceleakage ratestress relaxation
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