Most popular in the transportation of oil from production sites to the sites of processing were collapsible pipelines, which are characterized by high mobility, speed of assembly universal design (strip available in virtually any relief). During the construction of metallic collapsible pipelines (MSRT) is used steel valves: gate valves, cocks, valves, etc. In order to comply with all safety standards before commencing work on an assembly of piping, all the constituent parts are carefully inspected, there is also checking of details. After a thorough inspection begins msrt assembly – welding the main pipes and valves. The connection can be either flanged, as well as directly by welding. With a thickness greater than the thickness of fittings fittings pipe fittings or the transitional ring length less than 250 mm. Nozzles are made directly to the construction of workshops, from the pipes of the same brand of steel, and the pipeline, but with a wall thickness of less than rifles and more than a pipeline. Parameters of the heating front welded joints of pipe fittings with valves or rings point in the project collapsible pipeline, or are taken in accordance with these certificates for thicker walls or higher temperature heating.
Often, due to the nature of the relief is necessary to install bent parts collapsible pipelines. Rotations in the vertical and horizontal planes should be carried out by elastic bending, welding of the curves are bent in the cold or hot, or cooked in separate segments. Elastic bending pipe welded in a thong should be implemented with the help of cranes or other lifting Pipelayers mechanisms in the process of editing and laying prefabricated pipe in the trench. Welds performed on the track when welding the pipeline should be generally perpendicular to the axis of the aqueduct. Welding can be carried out both manual and mechanized method of arc welding by melting and pressing method on systems with automatic control of the welding process.