Results 1 to 10 of about 149 (70)
Mitigation methods and their applicability for DC stray current interference [PDF]
, 2016 Through indoor simulated experimental equipment,mitigation methods which contained the bond resistor method,galvanic anode method and metallic shield method were studied to mitigate DC stray current interference caused by the impressed current cathodic ...
DU Yan-xia, LI Wei, WANG Jie-jun
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±1100 kV特高压直流接地极对埋地油气管道直流干扰实测与分析
Gaoya dianqi, 2023 直流接地极电流会对大范围的埋地油气管道造成腐蚀和危险影响，特别是±1 100 k V特高压直流接地极，额定入地电流大，影响程度更大，影响范围更广。为获得特高压直流接地极对埋地油气管道的影响水平和管道电压分布规律，文中首次在昌吉—古泉±1 100 kV特高压直流输电工程调试期间，对邻近的川气东送管道进行了全面的测试，得到了管道通/断电电位分布、泄漏电流密度、阀室引压管电压和土壤电位梯度。根据现有标准中管道直流干扰的各项评价指标对管道测试结果进行了分析，相关测试结果可为川气东送管道的安全运行维护提供数据支撑，
曹方圆 +5 more
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Dianci bileiqi, 2022 随着综合能源走廊修建,电力架空线与油气管道交叉跨越情形时有发生,电力架空线在雷电袭击时会影响周围的埋地油气管道,此种情况下雷电冲击安全防护措施研究极为重要。本研究通过COMSOL Multiphysics有限元软件对混凝土桩基加设人工接地体方案进行建模计算,分析了土壤电阻率、外延接地体长度对管道电位的影响,对比了人工接地体与混凝土桩基钢筋导体的散流作用。针对杆塔水平与垂直方向接地体"引流"对临近管道电位的影响,提出了管道临近处杆塔接地网散流优化方案 ...
高晓晶 +6 more
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Dianci bileiqi, 2023 为分析大区域电网对埋地油气管道的持续干扰，本研究在分析持续干扰电压幅值随线路和管道间距变化规律的基础上，提出利用阈值确定大区域电网建模边界，以构建电网对管道持续干扰分析模型的方法，并建立了计算截断误差的概率模型。结果表明：由距离管道较远线路产生的小幅值干扰电压分量的向量和近似为零，且这些干扰电压分量向量和的模值近似服从瑞利分布；在分析线路平均间距大于200 m的220 kV电网对管道的持续干扰时，仅考虑管道两侧4.20 km内导线按ZB型杆塔排列的线路，4.10 km内导线按ZM型杆塔排列的线路，10 ...
郭磊 +7 more
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Optimization of IMU-based bending strain solving algorithm and full-scale experimental validation [PDF]
Objective The pipe bending strain identification technology based on an inertial mapping unit (IMU) in-line detector has seen extensive applications in China and abroad.
Jun WANG +7 more
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Mechanism-learning prediction model for pitting depth of buried pipeline based on HMOGWO-RF [PDF]
Objective China's oil and gas pipeline networks are expected to reach 24×104 km by 2025. Pipeline transportation has become one of the key means of transportation in the country.
Fulin SONG, Hong ZHAO, Xingyuan MIAO
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Dianci bileiqi, 2020 针对西北地区输电线路和埋地油气管道相邻交叉,输电杆塔接地体可能在雷电冲击下对油气管道放电的情况,通过试验的方法确定了针电极对油气管道间砂质土壤的平均击穿场强,分析了临界击穿场强的影响因素,并对土壤的击穿机理进行了讨论。试验结果表明沙质土壤中针电极对管道的临界击穿场强为200～300 kV/m,土壤电阻率对土壤的临界击穿场强影响不大,为确定西北砂质土壤地区输电线路和埋地油气管道的安全距离提供了参考数据。
郑智慧 +5 more
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Research on the inversion method of pitting corrosion defects in buried pipelines based on weak magnetic detection [PDF]
ObjectiveBuried pipelines play a vital role in the transportation of resources such as petroleum and natural gas. However, pitting defects frequently occur in these pipelines exposed to surrounding soil environments, seriously compromising their ...
Hong ZHAO +5 more
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Feasibility of lowering-in of longitudinally continuous cold-bends [PDF]
Objective Lowering-in is a primary method for underground pipeline laying. Continuous cold bends are utilized in place of hot-bending elbows at longitudinal turns along these buried pipelines.
Haichun LIU +8 more
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Soft detection model of corrosion leakage risk based on KNN and random forest algorithms [PDF]
Objective The integrity management of urban gas pipeline networks demands effective risk assessment methods. Corrosion leakage risk assessment necessitates the comprehensive integration of risk assessment factors with various detection operations ...
Chengzhi LI +4 more
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