The textbook describes the properties of working bodies, thermal engines, fuel properties, combustion theory, furnace devices, boiler plants. Thermodynamics studies ways to convert some types of energy into others; the main task of thermodynamics is to study methods for converting thermal energy into work (mechanical energy). The content of the book fully complies with the TUP and the State Inspection Service of specialty 0802000 "Construction and Operation of Gas and Oil Pipelines and Gas Storage Facilities." The manual is intended for the training of mid-level specialists.