Steel pipes with thermal insulation made of polyurethane foam with a protective shell are a rigid “pipe in a pipe” structure. They are intended for underground laying of heating networks (in a polyethylene shell – in a trenchless way, with a shell made of thin-sheet galvanized steel – in through channels and tunnels) and above-ground laying of heating networks (for pipes with a shell made of thin-sheet galvanized steel) with the following design parameters of the coolant: working pressure of no more than 1.6 MPa and temperature of no more than 140 ° C within the schedule of high-quality regulation of heat release 150 ° C-70 ° C). Insulated pipes are also used for pipelines transporting other substances (oil, gas, etc.).