bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mooring Tension Analysis of the Effect of Mooring Configuration Variations when LNG Carrier Moored to a Jetty
Authors: Yasmin Zein Indah Aqnaita Tidar , Djatmiko Eko Budi , Murdjito  
Published: February 2022

Abstract
Oil and gas exploration is mainly carried out offshore, which results in the need for an efficient means of structure for further onshore oil and gas processing. LNG Carrier is an effective and efficient means of transportation, therefore to maintain and restrain the movement of LNG Carrier during offloading to remain in a stable condition, it is necessary to build a mooring system facility. One of the critical things regarding the mooring system is the configuration of the number of moorings installed. It will affect the determination of operating limits and also the effectiveness of the installation. In this study, configurations will analyze the configuration of mooring vessel to jetty with variations in configurations 2-3-1, 3-3-2, and 4-4-3 and variations in vessel load case using operating environmental conditions and extreme conditions with swell effects. This research focuses on tension analysis in each mooring to find out the proper and effective configuration as well as obtain the operating limits that have been set.
The Strength Evaluation of 5600 DWT Double Hull Oil Tanker Subjected to Fender Load
Authors: Sisworo Sarjito Joko , Mursid Ocid , Samuel  
Published: February 2022

Abstract
The double hull of the oil tanker is more critical on the fender load because the wing tank was void at the full load condition. The strength evaluation of the side hull oil tanker based on fender load using two variables. Scenario A shows that the hull structure was safe based on the fender load. Scenario B shows that the side plate and longitudinal structure were damaged. PIANC needs to review the allowable strength of the pressure of the fender load on the ship with the tank.
Standardization of Technical Specifications and Budget of Charter Rate in Indonesian Oil & Gas Upstream Operation Support Vessel
Authors: Yuniar Willy , Dinariyana A A B 
Published: February 2022

Abstract
Special Task Force for Upstream Oil and Gas Business Activities (SKK Migas) is an institution tasked with managing upstream oil and gas business activities based on Production Sharing Contract (PSC). In carrying out technical evaluations and budget recommendations, there are often differences in specifications and budgets between PSC Contractors. In order to reduce the problems mentioned above, it is necessary to standardize technical specifications and charter rates for operations support vessels which will later be used as the basis for evaluating technical specifications and recommendations for charter budgets, for preparing owner estimates as the basis for negotiations in the ship procurement process. The problem-solving methodology adopted in this research is to collect data on operations support vessels in PSC Contractors and then evaluate the data with Multi Criteria Decision Making (MCDM) through the Elimination Et Choix Traduisant la Realite (ELECTRE) method, then the results will be analysed qualitative data, to further develop a standard technical specification and recommendation for vessels charter rates for each type of vessel.
Study Sedimentation Rate of PLTU Pulang Pisau Due to Jetty Modification in Efforts to Improve Production Capacity
Authors: Huda Abiyani Choirul , Maulana Muhammad Ilham , Pratikto Widi A , Suntoyo  , Wirawani Muhammad Khaisar , Michael Parulian S 
Published: February 2022

Abstract
Pulang Pisau Steam Power Plant (PLTU) is one of the plants that is used to fulfill the electricity needs of the people in Central Kalimantan Province. By using coal as a source of steam production, the Pulang Pisau PLTU has a capacity of up to 2 × 60 MW. Such a large population growth cannot be avoided and it is therefore denied that the Pulang Pisau PLTU is deemed to require additional production capacity. One alternative that can be given is to increase the amount of fuel capacity, namely coal that can be accommodated. By changing the design of the existing jetty, it is expected that ships with larger capacities can lean on the Pulang Pisau power plant pond. In this study, an analysis of sediment volume rate in the existing condition jetty and two alternative jetties in the PLTU river basin area, where the modeling is done using MIKE21. The results of the existing jetty modeling show the sedimentation volume that was line up for 12 months at 9550.017 m3, while the sedimentation volume of alternative jetty 1 and 2 produced for 12 months respectively were 917.444 m3 dan 8616.040 m3. The first alternative jetty is more efficient in dealing with sediment in terms of increasing production capacity. The alternative jetty is considered to be able to maintain the determined vessel draft and not cause excessive sedimentation impacts in the Pulang Pisau power plant area.
Design and Operating System of Floating Waste Treatment Facility in Belakang Padang
Authors: Ali M , Zaman M B , Prastowo H , Pitana T , Priyanta D , Siswantoro N , Busse W 
Published: February 2022

Abstract
The district of Belakang Padang consists of 108 islands. On these islands, 43 islands are inhabited and 65 islands are uninhabited. The source of pollution on this island comes from community activities on land, such as throwing garbage in the sea and so on. In this paper, Floating Waste Treatment Facility will be designed on Self-Propelled Barge (SPB) with principle dimension: Lpp = 13 m; B = 2.48 m; and T = 0.589 m. The barge can accommodate 7 tons of waste consisting of a garbage tank and a sorting process along with a plastic press machine to reduce the volume of plastic waste. In the calculation of the volume requirement for waste weighing 7 tons, that is 16.43 m3. With an estimated 9 hours of sorting work, it can meet the volume of waste needs. The total investment for the construction of this facility is Rp 362,087,076.12 and the annual operating costs are Rp 458,692,802.67. This facility is feasible to build because of the value of several economic metrics as follows: NPV Rp 488,234,793; IRR 26% and PI 2,348.
Design of Ocean Wave Power Plant with a Two-Axis Vertical Pendulum Mechanism System
Authors: Prananda J. , Setiawan A.M. , Baidowi A. 
Published: February 2022

Abstract
Renewable energy is a promising potential for the future, where this energy is low emission and environment friendly. One of the renewable energies that are abundant and rarely used is ocean waves. Energy from ocean waves can be extracted using an ocean wave power plant with a pendulum system (PLTGL-SB). The main components of PLTGL-SB are pontoon and pendulum, where the pendulum will oscillate when ocean waves hit the pontoon. This research will analyze PLTGL-SB with a two-axis mechanism. The analyzes were performed with simulations using CFD applications (computational fluid dynamics) and only used three degrees of freedom (pitching, rolling, and heaving). The design of PLTGL-SB has a length of 2.2 m, a width of 1.3 m, a height of 1.61 m, and an overall mass of 199.5 kg with two axes and two pendulums on each axis. The highest simulation results obtained a maximum deviation angle of 32.31° and an angular velocity of 1.44 rad/s with 10 kg pendulum mass and 1.0 m pendulum length at 0.5 m wave amplitude. If this design is used in the rumah apung Bangsring, it will require seven modules of PLTGL-SB and two additional 12V 50Ah batteries.
Modularization with Rule Based Algorithm in Three-Dimensional Design of Engine Room Layout Harbour Tug Diesel – LNG Dual Fuel Engine 2 × 2500 HP
Authors: Fathallah Aguk Zuhdi Muhammad , Prasojo Laurensius Abhisa Valasranggi , Semin  
Published: February 2022

Abstract
Implementation of the dual-fuel engine as ship main propulsion in Indonesia is low. There is a need for a study about the ship design process for dual fuel engine ship, especially for the engine room. Process and instrumentation diagram can’t give a whole picture of the real engine room, but three-dimensional can provide this. First, this study is to know about the process and instrumentation diagram on harbour tug diesel-LNG dual fuel engine 2 × 2500 HP. Second, this study is to know about the original, clustered, and reordered design structure matrix of all piping components. Third, this study is to know about three-dimensional design using modularization with rule-based algorithm. Components from the bilge & ballast system, oily water separator system, firefighting system, domestic supply and discharge system, marine diesel fuel oil system, LNG fuel oil system, lubricating oil system, cooling system, and compressed air system are inserted in original DSM. The rule-based algorithm is for clustering and reordering. At the end of the original, clustered, and reordered DSM there is a need for the objective function and sum value calculation. In this study, DSM modeler is used to do the clustering and reordering process included in one by clicked clustering algorithm feature. So, in this study is decided that reordering process is done manually using the workflow of the system to ensure that clustering algorithm feature can give clustered and reordered DSM, by compared the objective function and sum value from the original, clustered, and reordered DSM. The result of the objective function and sum value comparison always give less value than the original and clustered DSM. Clustered and reordered DSM had the same value. Sometimes the objective function and sum value of reordered DSM is greater than clustered DSM, which means there is human error when manually reordering the clustered DSM. Less value of the objective function and sum value DSM is used to create three-dimensional. Components that are included in one cluster need to be located nearly. Modularization with rule-based algorithm is applicable in three-dimensional design engine room layout.
Analysis of the Effect of Bend Angle Outlet Main Steam Line on the Steam Flow Characteristic
Authors: Nikmah A , Amalia R , Satrio D 
Published: February 2022

Abstract
Pressure drop is one of the problems that can occur due to bend components in the piping system. To minimize the pressure drop, modification of the bend pipe component was made at the bend outlet of the main steam line. In this study, an analysis of the effect of the bend angle on the pressure drop was carried out on the pressure and velocity steam distribution. The angle variations used are 30°, 45°, and 60° with the Computational Fluid Dynamics (CFD) method simulated by CFD software. The simulation results show that the lower the angle of curvature of the pipe, the lower the pressure drop and the lowest pressure drop is obtained in the 30° bend domain of 26.2 kPa. The pressure distribution pattern shows that the pressure value will increase from the inner wall to the outer wall. The greater the bend pipe angle, the greater the possibility of flow separation and pressure drop value. The velocity distribution pattern shows that the flow velocity becomes non-uniform after passing through the bend pipe. The greater the bend angle, the sharper the flow direction so that the time taken is longer. In addition, the greater the bend pipe angle, the greater the flow stagnation.
Numerical Study the Effect of Gap Ratio on Flow Characteristics and Heat Transfer in Staggered Tube Banks
Authors: Ariansyah M N , Diana L , Satrio D 
Published: February 2022

Abstract
Condenser is a type of heat exchanger that serves as condensation for turbine output steam. In general, a steam power plant uses a surface condenser. This type of condenser is a type of shell and tube. Condensers have a phenomenon of convection heat transfer. The change in distance between condenser tubes is one way to increase the rate of heat transfer. To produce maximum heat transfer, it can be determined by the variety of distances between tubes. The research was conducted by analyzing the flow characteristic and heat transfer around condenser tube banks with gap ratio variation (s/d), which compares transverse distance (ST
) and tube diameter (d) with variations of 3.2, 2.7, 2, and 1.7. 2-dimensional simulation with Computational Fluid Dynamics (CFD) is a numerical method and algorithm for solving and analyzing problems that occur in fluid flows. Based on the results obtained, the smaller the Gap Ratio, the lower the outlet temperature produced and the maximum heat transfer, but the pressure drop value obtained the bigger. Also, the smaller Gap ratio, the bigger v max produced. The lowest outlet temperature value at the variation of 1.7 is 310.66 K, and the coefficient of heat transfer is 103.34 W/m2K. Pressure drop produced at variation 1.7 is 515.99 Pa. Variation 2 is the best gap ratio variation, seen from the heat transfer result and the pressure drop value is not too large. The coefficient heat transfer and pressure drop in variation 2 are 76.95 W/m2K and 119.17 Pa.
Experimental Study on Coupled Motion of Floating Crane Barge and Lifted Module in Irregular Waves
Authors: Firdaus Nurman , Djatmiko Eko Budi , Prastianto Rudi Walujo , Muryadin  
Published: February 2022

Abstract
Installation and decommissioning activities of offshore structures often applied a floating crane barge for a lifting operation. The excessive movement response of lifted module affected by the motion of floating crane barge in waves can increase a large amplitude. However, the coupled motions of a floating crane barge and lifted module are not easy to predict accurately due to the dynamic movement of a lifted module and the complex coupling system. The coupled motion responses of a floating crane barge and a lifted module during lifting operation were investigated based on time domain by experimental method in this study. The model tests are carried out at Manoeuvring and Ocean Basin of Indonesian Hydrodynamic Laboratory, BRIN. The experimental conditions include the load cases of without and with a load of lifted module in crane tip, and the lifting operation was evaluated under irregular wave conditions. The experimental results show in that the phenomena of shift resonant frequency for the dynamic responses are clearly observed on the coupled motion of multibody system. The dynamic oscillations of the lifted module have a significant effect on the motion response of the floating crane barge. And the hoisting of lifted module has an obstructed effect on the rolling motion of crane barge.
Comparison of short-circuit current in AC and DC shipboard electrical power distribution systems: A case study of 17,500 DWT tanker vessel
Authors: Gumilang Ahlur R.N. , Kurniawan Adi , Sarwito Sardono , Budianto Firman , Kurniawan Akhmad R. 
Published: February 2022

Abstract
The current ability of power electronic devices increases the possibility to change the shipboard electrical power distribution system from widely-used alternating current (AC) to direct current (DC) systems. DC distribution systems has been known to offer higher power efficiency compared with AC distribution systems. However, the decision to move the shipboard electrical power distribution systems to DC systems requires more information in technical aspects aside of power efficiency. In this study, the investigation to compare short-circuit current between AC and DC distribution systems in non-electric propulsion vessel is conducted. The investigation is performed for electrical power distribution system of 17,500 DWT tanker vessel. Short-circuit current profile for both systems are obtained from simulation in computer software. The results indicate that the DC shipboard electrical power distribution systems has lower short-circuit current than the AC system for the same vessel.
LNG as marine fuel within Indonesia shipping sector, a literature review
Authors: Butarbutar R , Saut Gurning R O , Semin  
Published: February 2022

Abstract
The objective of this study is to review the state of art and the opportunity on LNG development as marine fuel for Indonesian shipping sector. Liquid Natural Gas (LNG) as one of source energy has become one progressing on research and development by several research company, classification society and shipping company. The research that has been done focused on the environmental benefit to the country. This was as a result of increasing quantity of pollutions due to marine fuel used by vessels. The interesting part from the study that LNG will reduce sulphur (SOx) until 90-95 % and reduce the carbon until 25 % which it causes for other alternative energy will develop and progress slowly. The use of natural gas as alternative energy is one of the goals to find the potential solution for ship owner to follow the IMO requirement for the stakeholder to implement the limitation on sulphur content from marine vessel exhaust gas. Annex VI mandated the ship operator to use marine fuel which contain 0.5 % sulphur or install the scrubber which it will expensively cost for the ship owner. LNG from some of literatures shown the most advance compare to other alternative fuel and it will provide benefit from environmental protection and cost efficiency.
Analytical Approach of Wave Transmission Coefficient through on Composite Hanging Breakwater
Authors: Paotonan C , Umar H , Rahman S , Rachman T 
Published: February 2022

Abstract
Conventional breakwater like a rubble mount is require large infestation, especially when that structure construct in deep water. Currently, innovations are needed to solve financial problems in building breakwaters. Composite hanging breakwater is proposed as a new solution in marine structure. Composite hanging breakwater made by both of stone and concrete or steel material consist of two-part are structural part and filler. Structural parts are piles, beams, and brackets made of concrete or steel. Filler material using of stone or other material. This structure has the advantage are cheaper than conventional breakwater, precast material, and the diameter of stone filler is relatively small. Until now, the performance of composite hanging breakwater is unknown. Commonly, the key performance indicator of breakwaters is wave transmission and represent by the waves transmission coefficient. Therefore, in this study, an analytical equation of wave transmission coefficient was developed using the conservation of energy concept. Based on this equation shows that the wave transmission coefficient is influenced by both structure and wave parameter. After the equation has been obtained, then it is compared with previous research. Research that has been used as a comparison includes research by Weigel (1960), Abul-Azm (1993), Liu and Abbaspour (1982), Abu-Azm (1993), Heikal (1997), Koraim (2005), Rage and Koraim (2010), and Koraim (2014). Wave parameter represents by waves steepness implicitly, and structure parameter is represented by the permeability of structure, relative length, and relative depth. The greater the value both of relative depth and length, the smaller value of wave transmission coefficient. The greater the value of structure permeability, the smaller the value of wave transmission coefficient. When the D/h is zero, the wave transmission coefficient is equal to one and when the D/h is equal to one, the transmission coefficient is close to or equal to zero. When the D/h value is less than 0.5, the Kt value in this present study is lower than the Kt value in previous studies for the same D/h value, and when the D/h value is greater or equal to 0.5 then the Kt value is close or the same with the previous study.
Finite Element Analysis and Topology Optimization Design of Anchor Mooring Winch Support Bracket
Authors: Huda Nurul , Mursid Ocid 
Published: February 2022

Abstract
The weight of the deck machinery greatly affects the position of the small ship’s center of gravity so that it also affects the stability of the ship. Therefore, it is necessary to conduct optimization studies to reduce the weight of ship deck machinery, especially anchor mooring winch, by reducing the weight of ship deck machinery will lower the position of the center of gravity of ship so that can improve ship stability. This paper presents the effects of a topology optimization examination based on the finite element evaluation on anchor mooring winch support bracket using the SolidWorks Simulation module. The main intention to examine is to optimize the general weight of the anchor mooring winch support bracket via way of means of thinning specific regions of the anchor mooring winch support bracket in keeping with the calculated minimum strain energy. The topology optimization algorithm that is used in the current study gives an optimal structural shape of the support bracket of the anchor mooring winch with the largest stiffness, considering the given quantity of mass so that it will be eliminated from the preliminary layout space. The complete sequence of steps for carrying out the topology control optimization study is shown, taking into account the constraints arising from the construction features and the method of manufacturing the support bracket of the anchor mooring winch. The layout became carried out, and the effects have been provided via way of means of evaluating the preliminary version and the optimized version. As the result of topology optimization study, its stress was increased by about 4MPa and mass was reduced by about 15kg in comparison with the initial design.
Risk Based Design of LNG Regasification Terminal in Kupang
Authors: Azalia A F , Dinariyana AAB , Artana KB , Ariana IM 
Published: February 2022

Abstract
The government of Indonesia has decided to switch fossil fuel to LNG for power plant fuel supply. According to Indonesian Ministry of Energy and Mineral Resources Decree RI No. 13K/13/MEM/2020, the government of Indonesia has decided to switch fossil fuel to LNG for 52 power plants in Indonesia, PLTMG Kupang Peaker is one of them. Currently, there are no facilities for receiving and regasification LNG in Kupang. Therefore, this research will accommodate the design of LNG regasification terminal by utilizing the vacant land in PLTMG Kupang Peaker area. The design is based on NFPA 59A and evaluated through fire risk assessment. In this research, the fire risk assessment consists of identifying hazards with HAZOP studies according to BS IEC 61882 : 2001 standard, frequency analysis through fault tree analysis (FTA) and event tree analysis (ETA), consequences analysis using fire modelling software ALOHA, and risk mapping using f-N curve UK societal risk criteria for process facility. From the risk mapping, there are 4 scenarios that are in the intolerable region. After mitigation using Layer of Protection Analysis (LOPA), the frequency value decreases and the risk for 4 scenarios that previously in the intolerable region can be lowered to the acceptable region.