一、前言本研究的目的是用冻堵法对输油管道进行检修、更换阀门、管道试压,以便在施工中应用。该法原理是利用局部冷冻管内液体,使之形成冻塞,隔离管内液体,以便进行管道检修等施工作业。本法的优点是设备简单,操作方便,管上不开孔,能保持管道的完整性。我们应用该法已获得成功。 First, the preface The purpose of this study is to freeze blocking method of oil pipeline overhaul, replacement of valves, pipeline pressure test, so that the application in the construction. The principle of the method is to use the local freezing of the liquid in the tube to form a freezing plug and isolate the liquid in the tube for construction work such as pipeline inspection. This method has the advantages of simple equipment, easy operation, the pipe is not open, to maintain the integrity of the pipeline. We have succeeded in applying this method.