原油储罐检修周期

Overhaul interval of crude oil tanks

基于极值统计原理,提出了原油储罐检修周期的评价方法,包括储罐腐蚀检测数据统计、腐蚀速率分析和不停产检修可使用寿命评估方法等。根据某原油库18座在役储罐的腐蚀检测数据的统计分析,得出储罐底板、壁板的减薄量及其腐蚀速率的统计值,评估了这些储罐的可使用寿命。结果表明,储罐的可使用寿命在8年以上,适当加厚底板或采取其他措施可延长储罐的检修周期。基于评价结果,建议延长原油储罐的停产检修周期,特别是将原油储罐的第二次及以后的检修周期由SY/T5921—2000标准中规定的5～7年延长至8～10年。

On the basis of the extremum statistical principle,a method to evaluate the overhaul interval of crude oil tanks was put forward,which includes statistical analyses of corrosion inspection data,the determination of corrosion rates and the assessment of serviceable life of on-line maintenance.A statistical analysis of corrosion inspection data for 18 in-service tanks of a crude storage was then made using this proposed evaluation method.Corrosion rates of tank floors and walls were statistically determined and their serviceable life was assessed.The results show that the serviceable life of the most tanks exceeds 8 years,and thickening the floor of tanks or taking other measures can extend their serviceable life.Based on these evaluation results,we recommended that the overhaul interval should be extended,especially the second and subsequent overhaul interval should be extended from 5～7 years specified in Standard SY/T 5921 to 8~10 years.