摘要
目的分析DNV-RP-F101方法评价相邻腐蚀管道失效压力的应用条件和计算方法的适应性。方法采用实验数据分析了DNV-RP-F101方法预测不同组合相互影响腐蚀管道失效数据的适应程度,应用已被实验数据验证可靠的非线性有限元数值,仿真研究了DNV-RP-F101标准的适应性。结果 DNV-RP-F101方法评价单腐蚀管道剩余强度的误差小,适应性强,作为相邻腐蚀管道失效压力评价基础合理。DNV-RP-F101方法评价相邻腐蚀管道失效压力的轴向间距限制条件设置合理,但环向角度限制应用条件远远偏离实际作用角度。DNV-RP-F101方法评价同尺寸相邻腐蚀管道失效压力整体误差在10%范围内;评价相邻腐蚀单独腐蚀长度系数之和超过某临界值后,预测值有大于真实值的趋势,评价结果存在预测风险;评价不同深度相邻腐蚀管道失效压力预测值明显高于真实值,评价结果存在预测风险,且误差范围跨度大,预测稳定性差。结论 DNV-RP-F101方法评价相互影响腐蚀管道剩余强度存在超过真实值的风险。
The work aims to analyze adaptability of evaluating application condition and calculation method of failure pres-sure of adjacent corroded pipelines in DNV-RP-F101 method. Experimental data was utilized to analyze adaptability of predict-ing failure data of different combination of interactional corroded pipelines in DNV-RP-F101 method, nonlinear finite element value verified to be reliable by experimental data was applied, and adaptability of DNV-RP-F101 standard was studied by simu-lation. The DNV-RP-F101 method had minor error and strong adaptability in evaluating residual strength of separate corroded pipeline, hence it was reasonable basis of evaluating failure pressure of adjacent corroded pipelines. DNV-RP-F101 method had reseasonable limit setting of axial spacing in evaluating failure pressure of adjacent corroded pipelines, but application condi-tions of toroidal angle limit highly deviated from actual action angle. Overall error of evaluating failure pressure of similar-sized adjacent corroded pipelines in the DNV-RP-F101 method was less than 10%. As separate corrosion length coefficient sum of adjacent corroded pipelines exceeded a certain critical value, predicted value tended to exceed true value, the evaluation results were subject to prediction risk. Predicted value obtained by evaluating failure pressure of adjacent pipelines in different depth in DNV-RP-F101 method was apparently higher than true value, the evaluation results were subject to prediction risk, the error range span was big and prediction stability was poor. The predicted value obtained by evaluating residual strength of interactive corroded pipelines in DNV-RP-F101 method may exceed the true value.
出处
《表面技术》
EI
CAS
CSCD
北大核心
2017年第7期183-190,共8页
Surface Technology
