长输管道封存技术

尽管闲置的长输管道始终采取防腐涂层和阴极保护来控制管道外壁的腐蚀，但管道内壁发生的腐蚀过程却是不可避免的。针对长输管道的特点，提出了三种封存技术，并进行了模拟长输管道封存试验。试验结果表明，水气相封存技术，即在扫线水中添加适量的缓蚀剂，可有效地抑制管道钢材在封存期内的腐蚀。该缓蚀剂一方面可抑制水相腐蚀，同时亦可挥发进入气相，抑制气相腐蚀。电化学研究表明，添加了缓蚀剂的封存液能防止管道内表面的腐蚀。

Plugging Technology Applied in Long Distance Pipeline.

The internal corrosions can not be avoided although external protection is always given by the coatings and CP for the idled long distance pipelines. Three plugging technologies are set forth in the light of the characteristics of long distance pipeline , and a plugging test simulating long distance pipeline has been made. The results showed that the water/gas plugging technology, by which proper inhibitor is added to the pigging water, can inhibite effectively corrosions occured to steel pipes within the plugging period. The inhibitor can control water phase corrosions and/or gas phase corrosions in the case of evaporating into a gaseous state. The test results from electrochemistry showed that the plugging liquid added with inhibitor can prevent the internal surface of the pipe wall from corrosions. This plugging technology is considered practical with its operability, low cost and good economical benefits.