文档介绍：自贡郊区埋地输气管道
外加电流阴极保护设计
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摘要
目前地下钢质管道的使用寿命仅几年到十几年,如果采取有效防护措施可将寿命延长到20~50年。这些措施包括使用防护涂层、阴极保护以及涂层与阴极保护的联合保护。
本设计对Φ630舒坪-雷公滩埋地输气管道采用外加电流阴极保护和涂层联合保护进行设计。设计内容包括涂层的种类(石油沥青玻璃涂层和3层PE涂层)、辅助阳极种类(高硅铸铁、石墨)、辅助阳极的规格(直径、长度、质量),辅助阳极的埋设方式(水平和立式)等。通过综合比较,确定了在采用外加电流阴极保护和涂层的联合保护下,本设计得到的最佳设计方案为:选用石墨作辅助阳极,涂层为石油沥青玻璃纤维,水平埋设方式为水平埋设一支辅助阳极,阳极规格为直径75mm,长度1000mm,参考质量为10kg,使用寿命24年。
关键词:外加电流,阴极保护,涂层
ABSTRACT
At present, underground steel pipeline life is from only a few years to 10 years, which can prolong use life for 20~50 years if effective protective measures is adopted. These are measures such as protective coating, cathodic protection and coating and cathodic protection of bined protection to be used .
Shuping-Leigongtan gas pipeline buried for Φ630 was used the joint protection of the impressed current cathodic protection and coating to constructe in Zigong in the design. Design contents included coating type(the petroleum pitch glass coating and 3-layer PE coating), type of auxiliary anodes (high silicon iron and graphite), specification of auxiliary anodes (diameter ,length and mass),and embedment fashion of auxiliary anodes (level and vertical embedments)and so on. By parison,under bined protection of the impressed current cathodic protection and coating the the optimum schemes have been identified that graphite is acted as the auxiliary anode ,the coating is the petroleum pitch glass fiber , 1 auxiliary anode is layed for the level, and the graphite anodes specifications are choosed that the diameter is 75mm, the length is 1000mm, reference quality is 10kg, the service life is 24 years.
Keywords:Impressed Current,Cathodic Protection,Coating
目录
中文摘要 Ⅰ
英文摘要 Ⅱ
1绪论 1
引言 1
阴极保护的发展历程 1
阴极保护原理 2
阴极保护的分类 3
牺牲阳极法 3
外加电流法 4
两种方法的比较 4
阴极保护参数 4
保护电位 4
保护电流密度 5
6
设计原理 6
设计实例 7
11
12
2自流井区埋地天然气管道阴极保护设计方案 13
设计原则 13
原则 13
应用条件 13