摘要
秦皇岛—北京输油管道外包缠改性石油沥青防腐绝缘层,同时采用外加电流及局部牺牲阳极的电化学防护方法进行防腐,由于管道埋地近20a,防腐层已逐渐劣化。根据管道防腐层现状,详细分析了防腐层老化的原因,(1)防腐层施工质量差;(2)预制管子在安装、运输、储存及下沟回填过程中的损坏;(3)管道热油运行的影响;(4)沥青材料随埋地时间的增长而劣化等。提出在加强防腐层施工质量、预制管道施工质量管理的同时,对热油埋地管道的运行应控制输油温度在60℃以下,防止防腐层老化、剥离、脱壳,定期进行管道防腐层检漏工作,及时安排管道防腐层的大修。建议结合我国实际情况,采用煤焦油瓷漆、挤塑聚乙烯和熔结环氧粉末等作为防腐材料。
Qinhuangdao-Beijing Crude Oil Pipeline is protected externally with modified petroleum asphalt plus impressed current and local sacrificial anodes. The coating has been gradually degraded due to long time underground burial of over 20 years. Based on site investigation analyzed in details are the causes of coating deterioration:(1) poor application quality;(2) damages to the prefabricated pipes during installation,transport,store and lowering-in/backfilling;(3) effects of hot oil in pipeline;(4) natural asphalt deterioration with time of burial. The following suggestions are given against coating deterioration;keeping the temperature of pipeline flow below 60 ℃ to prevent coating from degradation,disbonding and de jacketing; checking the pipeline regularly for leakage; organizing coating replacement whenever necessary; and paying attention to coating application and prefabricated pipes construction. It is pointed out that coal tar enamel,extruded polyethylene and fusion bonded epoxy powder are suitable coating materials in China.
出处
《油气储运》
CAS
北大核心
1996年第6期25-28,共4页
Oil & Gas Storage and Transportation
关键词
热油管道
防腐
绝缘层
沥青
输油管道
hot oil pipeline, corrosion protection, analysis, insulation, degradation, as-phalt
