共查询到16条相似文献,搜索用时 250 毫秒
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概述了漏磁检测技术的原理,及其在常压储罐底板腐蚀缺陷检测中的应用。采用英国Silver-wing公司最新的Floormap VS2i储罐底板腐蚀扫描仪对华阳电业有限公司后石电厂3000 m3储油罐进行了现场检测,得到了储罐底板腐蚀缺陷的分布情况。 相似文献
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基于振幅分布理论、统计理论,引入风险概念,综合分析储罐底板腐蚀的声发射检测和漏磁检测数据,得到基于漏磁检测数据的声发射参量对储罐底板腐蚀的量化方法。通过对10台样本储罐的分析,得到某一地区介质为原油的一类储罐的声发射典型参量对储罐底板腐蚀的量化关系,即声发射活度与风险腐蚀速率(CRP)的关系为Y=13514.65x,该模型的评价准确率为9022%。建立实际腐蚀速率(CTP)与CRP的关系模型,为Z=12.14x,得到CRP的12倍约为储罐底板腐蚀最严重部位的腐蚀速率的结论。这样对待评估储罐进行声发射检测,利用声发射量化评价模型,可得到CRP,进而得到管理腐蚀速率(CMP),参照API653-2009,可对储罐底板的剩余寿命进行预测。 相似文献
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基于统计理论,引入风险概念,综合分析储罐底板腐蚀的声发射检测和漏磁检测数据,得到基于漏磁检测数据的声发射参量对储罐底板腐蚀的量化方法。通过对6台储罐的分析,得到某一地区介质为原油的一类储罐的声发射典型参量与储罐底板腐蚀的量化关系,即声发射活度与风险腐蚀速率CRP的关系为:y=13946.9758x,得到CRP与实际腐蚀速率CTP的关系为:Y=12.0412x。对评估储罐进行声发射检测,利用该评价模型可得到CRP,进而得到管理腐蚀速率CMP,为储罐管理维修决策提供依据。 相似文献
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张勤 《机械工人(热加工)》2010,(2):65-66
大型储罐在石油化工行业使用普遍,但由于原油及其产品具有较大的腐蚀性,而且油罐在长时间使用中会使油罐底部的沥青基础下陷,造成底板局部有较大凹陷,形成腐蚀点,故储罐在使用当中底板被腐蚀烂穿的情况也很普遍。底板漏油,储罐将被迫停用影响生产, 相似文献
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原油储罐底板在运行中容易发生腐蚀,声发射监测技术通过分析声发射信号来判断底板腐蚀状态,为此需确定腐蚀过程中腐蚀信号的能量来源。根据声发射特点,利用表面能与电化学能推算出金属腐蚀的能量公式,并且利用MATLAB根据能量公式分析金属腐蚀声发射信号能量随腐蚀时间的变化关系。根据分析的变化关系曲线得出金属腐蚀电化学能量与表面能在金属腐蚀中所占比重有较大差别,说明金属腐蚀声发射信号能量的主要来源为电化学腐蚀产生的能量。对通过腐蚀速率来判断底板腐蚀状态具有一定的理论指导。 相似文献
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《Measurement》2016
The field signature method (FSM) is a nondestructive testing (NDT) method based on the potential drop (PD) technique and has been applied to online metal pipe corrosion monitoring for nearly three decades. The many advantages and benefits of the method have been reported in a number of studies, but few have reported on its limitations or shortcomings. However, the detection accuracy for pitting corrosion in FSM is very low. In this paper, the reasons for the low pitting corrosion detection accuracy of FSM were analyzed and it was found that different corrosion pits, which have different sizes, depths or positions, generally have differing influences on the potentials of nearby electrode pairs. Therefore, a new method using a subdivided resistor network to assess pitting corrosion is proposed and verified. When compared with the traditional method, the most important parameter, namely the pitting corrosion depth detection accuracy, can be significantly improved. 相似文献
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This paper presents the effect of external corrosion, material properties, operation condition and design thickness in pipeline
on failure prediction using a failure probability model. The predicted failure assessment for the simulated corrosion defects
discovered in corroded pipeline is compared with that determined by ANSI/ASME B31G code and a modified B31G method. The effects
of environmental, operational, and random design variables such as defect depth, pipe diameter, defect length, fluid pressure,
corrosion rate, material yield stress and pipe thickness on the failure probability are systematically studied using a failure
probability model for the corrosion pipeline. 相似文献