关于防腐大修的讨论与建议

地长输油气管道的防腐绝缘层大修理是延长管道运营寿命的必要措施。介绍了秦皇岛输油公司所辖防腐大修情况，分析并讨论了防腐大个舯存在的问题，认为：第一，理论上认为沥青防腐绝缘层寿命为２０ａ左右的观点并非合理，２０ａ应是平均寿命，不能一概而论；第二，用现行的离腐绝缘层电阻率的测量方法得到的数据不能可靠地说明防腐层老化程度；第三，防腐大修现场施工困难，质量难以保证。建议：防腐大修方案应在加强管理和实际检测不

Discussion and Suggestion on Pipeline Old Coating Displacement

Old coatings displacement is a necessary measures taken for elongating the service life of buried oil/ gas pipeline. The analysis and discussion have been made on the problems existed during the displacement by Qinhuangdao Oil Transportation Company. It is concluded that the standpoint which the service life of asphalt coating was 20-year is not correct on thoery,but the year should be an average service life and not treated as the same;the resistivity data of coating measured according to the current measurement method can not instruct the ageing extent of the coating;the old coating displacement is difficult to conduct because of inconvenient construction in the field. It is suggested that the displacement program should be worked out on the base of inspection;the displacement program of coatings should be firstly based on the results of leakage detection and bellhole inspection, secondly on analysis of the inspection of coating resistivity and daily inspection records;the displacement should be combined with coating repair;the quality supervision must be strenghened;the proper materials and new methods have to be selected to conduct the renovation and inspection of pipeline coatings.