Abstract: The safety management was among the most important management work for oil and gas pipelines． As an alternative，the risk grading division based on WebGIS was being considered to improve safety management．An information
management system for oil and gas pipeline based on WebGIS had been established using ArcGIS Server as the developing system of WebGIS，SQL Server as the database to store pipeline data and ArcSDE as the GIS Server．According to the practical pipeline situations，the expert grading method on risk assessment of oil and gas pipeline set by Muhlbauer W K was modified．
An analytic hierarchy process （AHP） was introduced to comprehensively evaluate the expert grading method，and a kind of categorization method for the risk of oil and gas pipelines was proposed．Finally，it was demonstrated with examples that this improved categorization method based on WebGIS is more intuitive and easier to apply．

Key words: WebGIS , Oil and gas pipeline , Risk grading division , Analytic hierarchy process

摘要： 安全管理是油气管道十分重要的管理工作之一。作为一种方法,基于WebGIS的风险等级区划能够提升安全管理水平。以ArcGISServer作为WebGIS开发系统,SQLServer作为存储管道数据的数据库,采用ArcSDE作为GIS服务器,构建了基于WebGIS的油气管道信息管理系统;结合管道的实际情况,对KentMW的风险评分法进行修改;引入层次分析法对专家评分水平进行综合评定,提出了油气管道风险等级区划方法。实例表明,基于WebGIS的改进的风险区划方法直观、简单易用。

关键词: Web GIS , 油气管道 , 风险等级区划 , 层次分析