Maritime Transport Of Oil And Gas Pipeline Corrosion Failure Risk Analysis

In China Oil and gas pipeline transportation is the fifth industry,It has a very important role in the national economy, within the scope of logistics and transport, called "Energy blood". In recent years, with the offshore oil and gas fields in the country’s development, transportation of oil and gas subsea pipeline corrosion risk is increasingly prominent, resulting in a marked increase in the number of accidents. Subsea pipeline corrosion failure once the accident, not only affect the entire oil and gas production and pipeline transportation operations will result in great economic losses to the state society. To carry out offshore oil and gas pipeline corrosion failure analysis, it is of great significance to guarantee the safe operation of the pipeline. Therefore, failure modes and reliability of study to assess the risk of submarine pipelines for corrosion, concrete work as follows:1) Firstly submarine pipeline environment, mainly due to corrosion of the summary; describes three methods to prevent corrosion and principles: the principle of cathodic protection method, a pipeline coating method and internal corrosion buffer method.2) Summary assessment of the five methods submarine pipeline corrosion residual strength of checking on the basis of literature: ASME-B31 G, DNV-RP-F101, PCORRC method, API597 guidelines and finite element method, and the advantages and disadvantages of five methods to compare analysis.3) Based on the model of external pressure and internal pressure pipeline corrosion defects in system reliability, it uses three models to evaluate the reliability of subsea pipeline corrosion, namely gamma model, inverse Gaussian model, geometric Brownian model. In the three models based on the above, this paper analyzes the reliability of calculation and based on homogeneous Gaussian process time(HGP) growth model, and using both corrosion defect analysis in real data-service pipe segment. Using Monte Carlo simulation stage method of data preprocessing and failure probability calculation of submarine pipelines, the final judgment of pipe possible failure modes: a small leak, a large leak, rupture.4) According subsea pipeline complexity of the environment, the establishment of a model based on subsea pipeline corrosion and do analysis. First, to predict CO2 corrosion defects comparison, and then on the basis of existing guidelines for pipeline corrosion characteristics were analyzed and compared, and finally the remaining strength of corroded pipes standard made parameter modification.5) Based on the complexity of submarine pipeline environment, a corrosion model based on submarine pipeline is established and the residual strength is evaluated.. Firstly studied and analyzed based on CO2 corrosion defect prediction model and its influencing factors, and then on the basis of existing guidelines on pipeline corrosion characteristics were compared. Finally, the correction parameters evaluation criteria predict the remaining strength of corroded pipeline.