In the world economy and the shipping industry, container, bulk carriers and oil tanker vessels are undergoing a bigger difficulty because of the imbalance on supply and demand with the view that ship's loading capacity is exceeded. For this reason, shipping companies are trying to reduce the operating cost through slow steaming. Thus, under this condition of continuous recession in shipping industry, saving on fuel consumption is the main issue. In this study, tests were conducted to find out the method of reducing fuel oil consumption by economically operating the ships, taking into account the main engine power and speed. The subject vessel's fuel consumption compared to the output is lower near the range of 138~157RPM. The engine speed showed significant increment to 144RPM and fuel consumption increased rapidly compared to the engine speed at 15knots and above. During sea trial test, the subject vessel's specific fuel rate(SFR) was 134.25[g/BHPh] while the calculated value after 10 years of operation is 137.1[g/BHPh] at speed range of 148~150RPM which is 70% of the load and this indicates an increase of approximately 2.1%.

Abstract
 1. 서론
 2. 선박의 제원 및 연료유 절감 방안
  2.1 제원 및 주기관 시운전 성적
  2.2 대상선박의 연료유 소모현황
 3. 실선계측 및 자료 분석
  3.1 주기관 출력 측정
  3.2 주기관 시운전 성적과 비교
 4. 대상선박 계측자료 분석
 5. 결론

• 김홍렬(목포해양대학교 실습선 지도교수) | H. R. Kim
• 김부기(목포해양대학교 실습선) | B. G. Kim Corresponding Author