The manual on thermal control of serial ships was developed by the Fuel and Energy Department, the Main Directorate of Shipbuilding and Ship Repair Enterprises and the Central Technical and Design Bureau of the Ministry of River Fleet . Regular thermal control is one of the main conditions for the proper technical operation of ships . It contributes to the reliability, durability and efficiency of the power plant with high performance, helps to identify and use reserves of power and productivity of ships, increases the profitability of the fleet. Thermal control of serial ships includes checking the operation of the main engines, speed and traction qualities of ships . The purpose of thermal control: a) to detect and eliminate shortcomings in the operation of the power plant and the propulsion complex of the ship ; b) maintain the normal specified modes of operation of the main engines, which contributes to the fulfillment of operational and technical standards by the ship ; c) to identify reserves for improving the productivity of the vessel by improving its speed and traction qualities. The poor technical condition of the main engines and propellers is the reason for the decrease in engine power, speed and thrust of ships. This is also caused by incorrect adjustment of engines, violation of the rules of technical operation, untimely implementation of planned preventions .. The above shortcomings reduce the carrying capacity of ships, increase the delivery time of cargo, lead to overexpenditure of fuel for transport work. Thermal control of serial ships during the navigation period is carried out by both thermal engineering parties and crews of ships under the guidance of mechanics. The manual describes the methods of organization and conduction of thermal control of serial ships, passport characteristics, nomograms, graphs and reference material necessary for you to sing thermal control. For practical use, the current system of units is saved .