库鄯输油管道开都穿越工程经验

Kaidu River Crossing in Korla-Shanshan Oil Pipeline

开都河穿越是库鄯输油管道一个大型穿越工程。工程采用了穿越速度快、管道埋深大、定位准确、对环境影响小的水平定向钻穿越方式。比较详细地介绍了施工技术和在工程质量控制方面所采取的措施。为避免低温焊接出现微裂纹,采取了焊前预热的措施;为保证回拖管道的防腐质量和管道使用寿命,选用两种美国产、专门用于河流水平定向钻穿越的热收缩套补口。为控制焊接质量,进行了试件检验及100％X光射线探伤和100％超声波探伤;为控制补口质量,除外观检查还进行了高压针孔检漏、防腐层剥离实验。在焊接、补口、检验完毕及管道回拖后进行了水压试验。通过一系列技术措施,使穿越工程顺利完成。

Kaidu River is a large river crossed by Korla-Shanshan Pipeline. Used in the project was the method of horizontal directional drilling, which is characterised by high construction speed, adequate depth of cover for pipeline, accurate location and low environmental impact. Described in this paper are the construction techniques and quality control measures. Preheating before welding was made to prevent microcracks. To prevent pipe coating from damage during back draging, American-made heat shrinkage sleeves were used, which are dedicated to the usage for directional drilling. Sample inspection, 100% x-ray and 100% ultrasonic examinations were made to guarantee welding quality. Joint coatings were inspected by means of high pressure pinhole, peeling test as well as visual examination. Finally, hydrostatic test was made.