Welcome to this issue of the introduction to the production process of polyurethane prefabricated buried insulation steel pipes. In the process of producing polyurethane prefabricated buried insulation steel pipes, we need to pay special attention to the following issues: first, we need to strictly control the production quality. To ensure uniform and dense polyurethane injection, avoid defects and voids in the insulation layer, which may affect the insulation effect, we need to strictly control every step of the production process.