Results of a Survey on the Actual Operation of Marine Engine : 2nd Report, Steam Turbine

Abstract

While the main engine manufacturers prepare instruction books and etc. from the designer's view point, chief engineers usually operate the engines according to the instructions with a certain extent of deviation based on their own past experiences. It is logical to think that such experiences of engineers should be fully studied by manufacturers and incorporated into design. Unfortunately, however, it appears that shipbuilders have not attempted to make such study. In view of the circumstances, the Kansai Society of Naval Architects in Japan sent inquiry to the chief engineers of more than thirty vessels to find the actual operating method of main engine. The following is the time required for and method for warming up and cooling down in actual operation found from the results of the inquiry. 1. Process of warming up and cooling down on each vessel is almost the same. 2. The time required for warming up and cooling down is largely different on each vessel. a. Turning hour of engine for warming up: Perfectly cold up to 3 hours Started after two day engine stop 2 to 3 hours Started after one day engine stop 1 to 2 hours Started after a half day engine stop up to 1 hour b. Time required from load up to full power 0.5 to 1 hour c. Time required from full power to propeller shaft stop 0.5 to 1 hour d. Time required from propeller shaft stop to turning for cooling down 3〜5 minutes 6. Time required for cooling down less than 2 hours