Results of a Survey on the Actual Operation of Marine Main Engines : 1st Report : Boiler

Abstract

Shipbuilders and main engine makers indeed operate marine main engines at their test runs, but the test runs do not allow them to get all-round experiences of operation on board of actual ships. Actual experiences of engineers on board are not fully exchanged even among the engineers themselves. In view of this situation, the Kansai Society of Naval Architects planned and carried out an extensive survey on the actual operation of marine propulsion engines. The survey was concerned on the process of warming-up and cooling-down of main boilers and turbines, and the process of several operations of main diesel engines. In this first report is explained the result of the survey on warming-up and cooling-down of main boilers. It was found that the average speed of raising steam-pressure was 71℃/hour when expressed in the saturation-temperature raising speed. The variation among the reported speeds was, as might be expected, very large, and a ship was reported to have had its main boilers in excellent conditions for two years since its first voyage up to the time of the survey in spite of an exceptionally high speed of pressure raising of 480 ℃/hour.