输油泵轴承温度频繁超温原因及对策

Frequent overtemperature causes of bearings of oil pump and its countermeasures

通过对某输油站输油主泵频繁出现非驱端轴承超温过热导致的停泵问题进行分析,指出故障表象是非驱端轴温逐渐升高并超标,而故障实质是主泵级间迷宫平衡套被通过平衡孔的夹带杂质的高压油流产生频繁抛丸冲蚀,导致轴向力逐渐不平衡,最终推力轴承不能平衡多余的轴向力;指出工艺管道布置方式是导致该输油站3#泵故障率最高、2#泵故障率次之、1#泵故障率最低的原因。基于这些因素,提出改进措施:在运行管理环节应采取调整进站过滤器滤网目数、缩短过滤清理周期、加强对重点管段的清管工作等措施;在站场工艺环节,应增加新型高效强磁除锈装置的技术改造。实际应用结果表明:上述措施可有效控制进入输油主泵的杂质量,从而保护主泵内部构件,特别是级间迷宫平衡套,有效地保证了输油主泵长周期运行。

Oil pumps are frequently shut down due to overtemperature of bearings at non-driving end. The failure is reflected by rising temperature of such bearings out of limit. In essence, axial force becomes gradually out of balance because shot blasting and erosion are frequently generated at interstage labyrinth balance set of primary pump by high-pressure oil flow with impurities that runs through balance holes, and consequently excess axial force can not be balanced out by thrust bearing. It is shown by further analysis that pump failure rate （3#〉2#〉1#） is dominated by process piping arrangement. Accordingly, it is concluded that the following measures shall be applied to operation management, such as adjusting screen mesh of incoming filters, shortening filter cleaning cycle and strengthening pigging of major pipe sections. Additionally, it is necessary to adopt novel high-efficiency strong magnetic cleaning devices in station process. In practical operation, the amounts of impurity that move into primary oil transfer pump is effectively controlled in a certain range due to the application of above mentioned measures, so the component parts inside the primary pump （especially interstage labyrinth balance set） are protected well. In this way, long-period operation can be guaranteed for primary pumps.