船舶力学
船舶力學
선박역학
JOURNAL OF SHIP MECHANICS
2014年
1期
124-131
,共8页
油气管道%腐蚀坑形貌%腐蚀坑剖面面积%腐蚀坑形状系数%有限元法
油氣管道%腐蝕坑形貌%腐蝕坑剖麵麵積%腐蝕坑形狀繫數%有限元法
유기관도%부식갱형모%부식갱부면면적%부식갱형상계수%유한원법
oil and gas pipelines%corrosion pit morphology%corrosion pit cross-section area%corrosion pit form factor%finite element method
ASME B 31G规范把复杂的腐蚀坑剖面曲线简化成矩形或抛物线投影,是造成ASME B 31G规范预测结果出现保守和不稳定性的重要原因。文章采用非线性有限元方法,综合分析了腐蚀坑剖面面积和腐蚀坑形状系数对腐蚀管道失效压力的影响,提出一种新的以腐蚀坑剖面面积和腐蚀坑形状系数描述腐蚀坑形貌的B31G修正公式,实际算例表明新提出的B31G修正公式的预测结果保守性低,预测误差稳定。
ASME B 31G規範把複雜的腐蝕坑剖麵麯線簡化成矩形或拋物線投影,是造成ASME B 31G規範預測結果齣現保守和不穩定性的重要原因。文章採用非線性有限元方法,綜閤分析瞭腐蝕坑剖麵麵積和腐蝕坑形狀繫數對腐蝕管道失效壓力的影響,提齣一種新的以腐蝕坑剖麵麵積和腐蝕坑形狀繫數描述腐蝕坑形貌的B31G脩正公式,實際算例錶明新提齣的B31G脩正公式的預測結果保守性低,預測誤差穩定。
ASME B 31G규범파복잡적부식갱부면곡선간화성구형혹포물선투영,시조성ASME B 31G규범예측결과출현보수화불은정성적중요원인。문장채용비선성유한원방법,종합분석료부식갱부면면적화부식갱형상계수대부식관도실효압력적영향,제출일충신적이부식갱부면면적화부식갱형상계수묘술부식갱형모적B31G수정공식,실제산례표명신제출적B31G수정공식적예측결과보수성저,예측오차은정。
The failure pressure of oil and gas pipeline with different morphology of corrosion pits was anal-ysed by using the nonlinear finite element method. The impact of the cross-section area of corrosion pit on pipeline failure pressure with the axial and circumferential corrosion was researched. The analysis showed that the cross-section area of corrosion pits seriously influenced the failure pressure of pipeline with axial corrosion, however, which was not enough to fully describe the effects of the morphology of corrosion pits on pipeline failure pressure. The research considered the effects of the morphology of corrosion pits by us-ing the cross-section area of corrosion pit and form factor of corrosion pit to descripe on pipeline failure pressure, and proposed a new B31G correction formula. The results show that forecast error and the fluctu-ation range of the error are little using the formula.