天然气管道内涂层磨损研究

Study on wear of internal coating of gas pipeline

为了有效分析各种工况对天然气管道内涂层的影响,提高涂层的使用寿命,通过模拟实际工况条件,利用天然气管道内涂层全尺寸设备,进行了粉尘磨损、热风循环和清管器拖拉实验,分别得到天然气中携带粉尘、温度变化和清管器运行对涂层影响的实验数据。分析结果表明:天然气粉尘和清管器运行对管道内壁减阻涂层的磨损影响较大,温度变化产生的热应力对涂层的影响相对较小。因此,降低天然气中粉尘的含量,减小清管器皮碗与内涂层之间的摩擦因数,减少清管器过盈量和使用轻型清管器,均可以减轻天然气管道内涂层的损伤,从而延长其使用寿命。

For the purpose of analyzing different working conditions of internal coating of gas pipeline and improving service life of coating', a test is carried out on dust wear, heated-air circulation and pig pulling with a full-seize equipment by simulating actual working conditions, and the parameter in the impact of the dust carried by gas, temperature change and pig running on the coating are obtained, respectively. Analysis results show that dust and pigging running have great impact on the wear of internal coating of pipe wall, and the thermal stress caused by temperature change has a relatively slight impact on the coating. Therefore, decreasing the concentration of dust and reducing the friction factor between pig cups and the internal coating, as well reducing the magnitude of interference and using light-type pig can all reduce the damage to the internal coating, which can improve the service life of internal coating for gas pipeline.