Pipeline construction method for torch emptying system

The invention discloses a pipeline construction method for a torch emptying system. The pipeline construction method comprises the following steps that S1, an inner pipe is prefabricated; S2, a plurality of pipe sections are welded and seamless pipe sections penetrate through a pipe according to a preset drawing in sequence; S3, a support of the prefabricated inner pipe is welded and inspected; S4, an elbow in the inner pipe, the remaining pipe section and a torch head flange are welded, and a welded junction of the prefabricated inner pipe is inspected; S5, pressure test treatment is carried out after installation of a plug and a tool is completed; S6, a bearing protection plate in the first split pipe section is welded according to the preset drawing, the split pipe section is installed, and assembling and welding of the first split pipe section and a seamless steel pipe section are completed; S7, the remaining multiple split pipe sections are assembled and welded in sequence; S8, an outer pipe is prefabric