Conclusions and Suggestions were encountered management information risk grade is the beginning and end of the oil and gas pipeline is encountered with the old pipeline connection is shown in figure 1 of the risk assessment process encountered management encountered pipe section 1.5.1 hazards identification risk control risk assessment report section area for oil and gas pipeline is encountered divided into risk assessment method based on the oil and gas pipeline integrity management norms "finally a weld or flange. The principle of pipeline section division is to optimize route selection by risk classification of related factors in the process of oil and gas pipeline rerouting. When it is not possible to avoid high consequence areas, safety (GB32167-2015) should be adopted. When important changes are realized in high consequence areas during the construction period, segment points are inserted. In the risk assessment, we must identify and analyze the harm degree of different factors, and take full protective measures in the process of refined oil line change.

Rerouted pipeline routing is also based on the specification of high consequences in the risk sources mainly include: ① Analysis of the risk factors of the transport medium. The high consequence area identification report can effectively improve the safety and economy of pipeline operation. The semi-quantitative wind high consequence area identification ② pipeline line risk factor analysis. (3) 1.5 risk factors for risk assessment of oil and gas pipeline construction process encountered is to point to by pipeline defect of ontology, local planning adjustment or after high consequence areas, etc., and to adjust the original pipe routing and laying of pipeline renovation project, in order to reduce the reroute pipeline risk levels need to be encountered pipe mouth in risk assessment, and can have oil and gas pipelines in encountered before carrying out, Prior to the evaluation, the contractor shall require the pipeline management unit and the preliminary design of the diversion scheme. The risk assessment of the pipeline segment is the risk assessment method of feasibility demonstration.

Practical risk assessment methods. Stage of risk assessment of buried steel pipeline. The risk assessment process, such as the case design unit providing the required information, varies with the level of detail provided at different stages of the route change. The information includes but is not limited to the following aspects: (1) Project overview. (2) Qualification of engineering design unit and its scheme design report. ③ Other relevant information. Listen to the risk assessment of line change. (4) Analysis of risk factors during operation. 1.1 Risk assessment process 1.2 Data collection and analysis 1.3 Hazard identification 1.4 Identification of high-consequence areas As shown in Figure 1.