International Journal of Marine Engineering and Applications

IMPLEMENTATION OF RCM IN MAINTENANCE STRATEGY OF FO SYSTEM, LO SYSTEM, AND COOLING SYSTEM MAIN ENGINE

2025-10-15T01:41:52+00:00

The performance of a ship’s main engine largely depends on the reliability of its three primary subsystems: fuel, lubricating, and cooling. These systems must operate optimally to ensure efficiency and safety under varying operational conditions. This study evaluates the reliability of the KM. Lawit main engine subsystems using the Reliability Centered Maintenance (RCM) approach. Four analytical methods were applied: Failure Mode and Effect Analysis (FMEA) to identify critical components, Fault Tree Analysis (FTA) to trace root causes of failures, Reliability Block Diagram (RBD) to model interrelationships, and Monte Carlo simulation to estimate system reliability probabilistically. The analysis was based on operational and maintenance data from 2023–2024. FMEA identified the duplex filter in the fuel system (RPN = 288), the lubricating oil filter (RPN = 280), and the expansion tank in the cooling system (RPN = 140) as the most critical components requiring priority maintenance. Monte Carlo simulation over a 3,250-hour period showed the cooling system achieved the highest reliability, with a Mean Time to Failure (MTTF) of 1,022.21 hours and a Mean Time Between Failures (MTBF) of 7,587.47 hours. Across all systems, availability levels exceeded 99%, indicating strong reliability and minimal risk of operational failure. These findings highlight the effectiveness of integrating FMEA, FTA, RBD, and Monte Carlo simulation within the RCM framework. The results emphasize the need for preventive maintenance strategies to sustain the long-term operational stability and safety of the main engine

ANALYSIS FOR A SAILING SAFETY INFORMATION SYSTEM IN KARANGHARJO VILLAGE, KRAGAN SUBDISTRICT, REMBANG REGENCY

2025-10-13T06:12:05+00:00

Karangharjo Village, located in Kragan Subdistrict, Rembang Regency, is a community where the majority of residents work as small-scale fishermen using vessels under 5 GT. These fishermen face a high risk of maritime accidents due to a limited understanding of and access to sailing safety technology. Based on a social mapping survey conducted in 2024, the village has 25 fishing groups with a total of 250 fishermen. Every year, maritime accidents occur, resulting in physical disabilities, fatalities, and an increasing number of orphans. Advanced satellite-based safety mitigation and navigation technologies, which are commonly used by larger vessels, are difficult for these small-scale fishermen to access due to informational and economic constraints. The Marine Affairs and Fisheries Agency of Rembang Regency states that 30% of maritime accidents are caused by a lack of information and inadequate navigation devices, a situation worsened by the fishermen's highly fluctuating income. The problems are formulated as follows: how can sailing safety technology be implemented for small-scale fishing groups, and how can an information system workflow be designed for maritime emergencies? The problem-solving approach for this research involves a needs analysis of small-scale fishermen and the development of an information block model for emergency response. Based on these issues, the objectives of this study are to reduce the rate of maritime accidents in Karangharjo Village and to accelerate the handling of emergency situations. This study uses a mixed-methods approach, combining quantitative and qualitative techniques with the Sustainable Livelihood Approach (SLA). The expected outputs of this research are a publication in an accredited international journal and a copyright, falling under the category of Key Performance Indicator (IKU) 5, as research results that are utilized by the community.

DEVELOPING A DATA-DRIVEN METHOD FOR YACHT DIMENSION PREDICTION

2026-02-03T04:05:51+00:00

A yacht's principal dimensions can be found in many ways. However, due to the massive technological advancements in the yacht industry, using these ancient methods is just a waste of time. A new statistical method is necessary to determine yacht dimensions in an easy and effective way. In this paper, 122 modern yacht data have been used to investigate the relationship between length, breadth, draught, speed, gross tonnage, and power, and to perform regression analysis to develop a new method for estimating yacht dimensions. This study developed two predictive models: Model 1 utilizes empirical ratios and trendline equations, while Model 2 employs sequential stepwise multiple regression. The models effectively estimate breadth, draft, gross tonnage (GT), speed, and power from a specified length, with geometric parameters (e.g., GT prediction R²=0.97 in Model 1) showing higher reliability than performance parameters. The minimum and maximum ratio of Length to Breadth, draught to breadth, for a different range of ship length is also determined. This research is conducted in such a way that the owner’s requirement for a new yacht is the length, and other particulars are determined accordingly.

ANALYSIS OF PROCESS TIME AND COPPER SLAG REQUIREMENTS IN THE SHIP HULL BLASTING PROCESS

2026-02-03T04:04:31+00:00

The blasting process in the shipping industry aims to clean the surface of the plate from dirt, rust, and mill scale, and provide surface roughness so that the paint layer can adhere well. In the blasting process, abrasive materials are often used once or twice, but in field practice, reused copper slag has been used as an abrasive material. This study aims to analyze the weight of abrasive material requirements and process time during the blasting process using the Analysis of Variance (ANOVA) method with variations in new copper slag use, reused copper slag 1 and 2 as abrasive materials reaching the standard cleanliness level of SA 2.5 and the surface roughness level according to the International Maritime Organization (IMO) Performance Standard for Protective Coatings (PSPC) 30 – 75 mikron and the International Organization for Standardization (ISO) 8501-1. The results of this study indicate that fresh copper slag and reused copper slag-1 exhibit lower effectiveness in the blasting process; both types of copper slag require a longer time to reach the SA 2.5 cleanliness standard, resulting in increased abrasive material requirements. On the other hand, reused copper slag-2 exhibits better performance with shorter blasting time and minimal abrasive material requirements in accordance with the ISO 8501-1 SA 2.5 cleanliness level.

STRENGTHENING CYBER SECURITY IN PORT FACILITIES: NEW THREATS AND MITIGATION STRATEGIES

2025-09-24T02:16:02+00:00

The development of digital technology and automation in port facilities increases the risk of cyberattacks that can disrupt logistics operations and maritime security. According to a recent report, 72% of port facilities in Indonesia have experienced attempted cyberattacks in the past three years, with potential losses reaching USD 5.2 million per incident. This study aims to analyze cyberthreats in port facilities and evaluate mitigation strategies. The research method used was descriptive quantitative, with data collected through a survey of 120 port security officers, interviews with 15 operational managers, and an analysis of 10 related cybersecurity policy documents. The results showed that 68% of facilities had a moderate to low level of cybersecurity readiness, 74% of respondents emphasized the importance of human resource training, and 63% of facilities had not implemented a real-time intrusion detection system. Recommended mitigation strategies include the implementation of comprehensive network security protocols, multi-layered digital surveillance, and regular training programs for all personnel. These findings emphasize the urgency of integrating cybersecurity policies with daily port operations to reduce the risk of disruption, improve operational reliability, and minimize economic losses.