Supervision of marine resources to theft become one of the benchmarks that the country can maintain its maritime territorial sovereignty. Needs warships can certainly support the performance of the military to carry out military operations. The problem is that warship slamming behavior always occurs in high-speed vessels and can cause boat sunk. This research aims to predict the probability of slamming in operational areas where open water in Indonesia have a significant wave height of about 2 – 5 m. The probability of slamming is provided from the response spectrum of heaving and pitching motion. The response spectrum is obtained from the multiple between Response Amplitude Operator (RAO) and wave spectrum which these values are determinedby design of vessel and wave condition. This numerical analysis is carried out by using panel method. The output of this research is the probability of slamming which is important to determine the intensity of slamming during vessel operates. From the result of the numerical analysis, the intensity of slamming of warship is 1316 times per hour when the heading angle is 135 degrees and ship speed is 30 knots.
Naval Architecture, Institute of Technology Sepuluh Nopember, Indonesia
A Corrosivity Study Of Sea Water In Three Locations By The Rust In Impressed Current Cathodic Protection To The Protection Current Of Steel Pipe
M. Fitrullah, Fauzie Rachman, P. Tarigan, Wahyudin, Soesaptri O, Suryana, A. Aziza T. Partuti, Yanyan D, Andinnie J, Adhitya Trenggono, Anistasia Milandia
Corrosion is a serious problem and disadvantage in the material world. Losses caused by corrosion should be prevented so that the material can be resistant to the environment. One material that is susceptible to corrosion is made of steel pipes. Coating is intended for the first protection on the pipe and the impressed current cathodic protection (ICCP) is as protection when the coating layer is damaged, so it takes a combination of protection on the pipe. The damaged coating can be protected by the ICCP by giving the current flow through the structure to avoid the corrosion. However, in a seawater environment that is extremely corrosive, it may be that the pipe is not protected because of the different characteristics of the sea water. This must be anticipated by adjusting the current capacity given so that it reaches up to -850 mV potential conditions. Therefore, the current is required based on the sea water condition. This study was conducted using a sample of steel pipes of ASTM A106 Grade A giving the coating with primer coat epoxy and a top coat of epoxy. The pipe is then given an artificial defect with size of R3, R4 and R5 (ISO 4682-3) or equal to 1%; 8% and 40% of the surface area of the pipe and also the defect of 20% and 60%. Furthermore, it was conducted the impressed current cathodic protection with the steel anodes, reference electrodes of Ag / AgCl. The electrolyte media used is sea water in Tanjung Priok, Merak and Bojonegara. Before measuring the protection current needs from each sea water, the potential must show -850 mV at the end of the pipe. In the study, it can be seen that the wider disability, the greater the protection current flow. The more corrosive sea water, the greater the need for protection current.
Metallurgical Engineering, Faculty of Engineering, Sultan Ageng Tirtayasa University, Banten, Indonesia
Indonesian Coating Association – Bandung, West Java, Indonesia
This paper presents the collision avoidance assessments for ships passing through the Straits of Malacca. The data of the ships traffic in Strait of Malacca were obtained from automatic identification system (AIS) receiver installed at the Marine Technology Centre, Universiti Teknologi Malaysia (UTM). A MATLAB program was developed firstly to retrieve the data for assessing the collision risks and secondly, for evaluating collision avoidances by using fuzzy logic for a specified ships traffic area and period of time. The fuzzy membership function for collision risk assessment that have been considered for analysis, were distance to the Closest Point Approach (DCPA) and Time to the Closest Point Approach (TCPA). While fuzzy membership function for collision avoidance decision making were collision risk and collision condition. The decision making was formulated in accordance with the International Maritime Organization Convention on the International Regulations for Preventing Collisions at Sea (COLREGs), 1972, to avoid conflicts that might occur during sea navigation in the strait. Three critical collision conditions were evaluated for collision avoidance decision making, namely, head on situation, crossing situation, and overtaking situation. The results showed that the recommended decision makings from the developed fuzzy logic program follow well the COLREGS.
Marine Technology Centre, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Malaysia
Department of Aeronautics, Automotive & Ocean Engineering, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Malaysia
Navigational safety is an essential and very important element within an effective port and its operations. Relevant literature states that studies and researches on the service attributes of ports for ship navigation safety should be done as it enhances the ships passing through the narrow, shallow and busy waterways. In this study, a fuzzy Analytic Hierarchy Process (AHP) model is proposed to identify the perspectives of shipmasters on the service attributes of ports for ship navigation. Initially, those attributes will be investigated based on relevant literature and the features of ship navigation in ports. The quality of process in the fuzzy AHP model will be improved by the implementation of six sigma method. Causes of defects (errors) will be identified and removed. The variability analytical processes will be minimized. Dissatisfaction Attitude (DA) index will be used to determine the attributes’ priorities, where the port authorities may invest new policies to improve ship navigation safety. The result is expected to construct number of port service attributes for ship navigation safety. Besides that, the theoretical and managerial implications of the findings for port authorities in improving ship navigation safety are discussed.
Marine Technology Centre, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Malaysia
Lifeboat is one of important parts of the ship where without lifeboat, the ship not allowed to sail. Nowadays there were many problems on lifeboat releasing and handling system that involve injuries and fatalities, lifeboat should save people live but unfortunately lifeboat were cause loss of live on board ship during lifeboat operation. This study objective is to examine the factor and problem of lifeboat releasing operation. The factor, problem and activity were been highlight as the reference and guidelines for seafarer to prevent accident and problem during lifeboat operation. Several way and recommendation to minimize the problem is stated based on the factor determined. The factors have been examine are the design of lifeboat releasing system, maintenance of lifeboat and the training drill of lifeboat for this study and each relation was analysis by descriptive and qualitative in SPSS software. The mean and Pearson correlation tool were used to analysis the factor in this study. As the conclusion, the design of lifeboat releasing system show small relationship top lifeboat operation while lifeboat maintenance and training drill lifeboat show the strong relation to lifeboat releasing operation.
Marine Technology Centre, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, Malaysia
Water is a vital necessity in human life. At this time the community needs for clean water is increasing, this is not just due as a result of population growth with all its activities, but also with the increasing advancement of science and technology, also increase the level of social and economic. Especially in New York City that the geographical condition is below sea level, which is also known as the city of a thousand streams. But unfortunately the condition of the water is unfit for use in day- to-day. To overcome this, the need for a water supply system. Research under the title "Construction of Water Treatment Plant (IPA) With a capacity of 50 liters / hour" River to take raw water for the production process is carried out as well as laboratory taps for testing water samples before and after the process. Methods The study was done by several methods: The study was conducted in the field to carry out the retrieval source of raw water to be tested against the tools that have been made to get the water and then tested in labolatorim. After calculation, the water treatment plant with a capacity of 50 l / h obtained the following results Unit coagulation with contact time of 40 seconds, the volume of 0.00056 m3 tub, and the water level above the threshold v notch 0.096 cm. Flocculation unit system Buffel vertical channels with 6 stage flocculation, damp maximum height 0.437 m, the total contact time of 45 minutes, a maximum flow rate 0.1357 m / s. Sedimentation unit with a contact time of 0.88 hours, bebab external surface (so) 0.45 m3 / m2 / h, the Tilt Plate Settler (θ) 60o, number plate settler 51 pieces, Having conducted experiments on the tool by taking raw water is water river turbidity values obtained an average decline reached 96.26%. And reached 94.69% decrease in color.
Mechanical Engineering Department of Islamic University Kalimantan, Kalimantan, Indonesia
Industrial Engineering Department of Putera Batam University, Batam, Indonesia
Toll Road Development Project Nusa Dua - NgurahRai - Benoa, Bali is a big project that does not escape from the various safety and health risks due to the work done fixing some point in the middle of the sea that is a big risk. Poor risk management on the project will cause the loss is not small. Late work is also one that allows the risk to occur. The purpose of this study is to identify risks to safety and health on highway construction projects over the ocean (Nusa Dua – Ngurah Rai - Benoa) through brainstorming and interviews using questionnaires to the parties involved in handling-highway construction, and assess the risks identified so getting risks dominant (major risk), the risk categories are not acceptable (unacceptable) and the risk is not expected (undesirable), which is then performed mitigation measures to reduce the risk. In this study, the risks identified are as many as 43 (forty three) and is divided into 3 activity is a routine activity in the project area, offices, warehouses, workshops, public activity of which is the mobilization and demobilization in the field and the main activities include piling work, bar cutter/bender, formwork, casting concrete, paving and electrical installations. Risks that are obtained from natural sources of risk, project risk, technical risk and human risk. After the assessment, there are 6 categories of risk is not acceptable (unacceptable) and 14, the risk included in the category not expected (undesirable).
Civil Engineering Department, Bali State Polytechnic, Kuta Utara Badung Bali, Indonesia
The ultra-deep water is a severe condition that leads to a challenge to the subsea pipeline during installation and operation. Subsea pipeline is subjected to extreme internal and external pressures. The difference of internal and external pressures in ultra-deep water is a critical issue in selection of wall thickness of subsea pipeline to be safe during installation and operation. In this paper, design and assessment of subsea pipeline in ultra-deep water is presented using Subsea Pro Simulation based on safety zone. In the software, the safety zone is determined based on internal and external loads acting on subsea pipeline.Results of simulation agree with current operating wall thickness.
Department of Aeronautics, Automotive and Ocean Engineering, Mechanical Engineering, UniversitiTeknologi Malaysia, Malaysia
High Performance Computing, Centre for Information and Communication Technology, UniversitiTeknologi Malaysia, Malaysia
