CAJ | 학술논문

为了满足油气输送需求，现将一输水管线改输高压天然气，需对该管线改输的可行性进行研究论证，通过ANSYS建模分析得到腐蚀缺陷处在4.75 MPa高压下所受到的最大等效应力小于管道的设计抗力273.6MPa，满足安全标准。利用OLGA模拟出管道输送高压天然气时的压力和温度曲线满足实际工况要求，OLGA模拟出的预测腐蚀速率最大处为0.04mm/y，对管道的剩余寿命影响较小。应用DNV腐蚀因素失效概率模型计算得到该管道的失效概率小于1.5×10-3，安全等级介于“一般”和“很高”之间。经研究论证得该管道改输高压天然气是可行的。该研究提出了针对管线改输可行性分析的一般方法和步骤，能够为其他改输管线提供一定的参考。
위료만족유기수송수구，현장일수수관선개수고압천연기，수대해관선개수적가행성진행연구론증，통과ANSYS건모분석득도부식결함처재4.75 MPa고압하소수도적최대등효응력소우관도적설계항력273.6MPa，만족안전표준。이용OLGA모의출관도수송고압천연기시적압력화온도곡선만족실제공황요구，OLGA모의출적예측부식속솔최대처위0.04mm/y，대관도적잉여수명영향교소。응용DNV부식인소실효개솔모형계산득도해관도적실효개솔소우1.5×10-3，안전등급개우“일반”화“흔고”지간。경연구론증득해관도개수고압천연기시가행적。해연구제출료침대관선개수가행성분석적일반방법화보취，능구위기타개수관선제공일정적삼고。
In order to meet the transport needs of oil and gas , a water pipeline needs to be changed into the high-pressure natural gas pipeline , and the feasibility should be demonstrated .By ANSYS modeling and analysis , it showed that the maximum equivalent stress at corrosion defect position of the pipeline under high pressure 4 .75 MPa was less than the designed resistance of pipeline 273.6MPa, which could meet safety standards .The pressure and temperature curves of the pipeline transporting high-pressure natural gas were simulated by using OLGA software , which could meet the actual working conditions .The maximum corrosion rate was 0.04mm/y by OLGA simulation, which caused little impact on the remaining lifetime of the pipeline .The failure probability of the pipeline was less than 1.5 ×10 -3 by using DNV corrosion factor failure probability model , and the security level was between "nor-mal"and "very high".The conclusion was concluded that changing the pipeline to transport high -pressure natural gas is feasible .The study presents the general feasibility analysis method and steps for pipeline transport switcho -ver, and it can provide a reference for other transport switchover pipelines .