高海拔长距离管线输油泵机械密封失效分析及预防

Failure Analysis and Prevention of Mechanical Seal for Long Distance Pipeline Oil Pump at High Altitude Area

油泵密封是影响泵工作可靠性的重要因素,机械密封具有泄漏少、摩擦功耗低和寿命长等优点,广泛应用于流体机械,其密封失效是造成设备维修的主因。通过对世界海拔最高的长距离输油管线离心泵机械密封的失效现象进行分析,指出主要原因有压力过高、汽化、管线内杂质以及过滤器堵塞造成的正压抽空现象。针对现场实际,提出了稳定操作工艺、避免压力超限、密封弹簧的合理预紧以及消除杂质等预防措施,从而提高了泵工作的可靠性,保证了输油的安全性与经济性。

Oil pump seal is an important factor affecting the reliability of pump work. The mechanical seal has the ad- vantage of leakage, low friction power consumption and long life, and it is widely used in fluid machinery. The seal failure is the main cause of equipment maintenance. The failure of mechanical seal for long distance pipeline oil pump at high altitude area is analyzed. It is pointed out that the main reason is that the pressure is too high, vaporization, impurities in the pipe and positive pressure evacuation caused by filter blockage. In order to improve the reliability of the pumps, ensure the safety and economy of oil transportation, the corresponding preventive measures such as stable operating process, avoiding the pressure limit, reasonable pre tightening of the seal spring, removing the impurities and so on are put forward according to the actual situation of the field.