Ocean Engineering : Jurnal Ilmu Teknik dan Teknologi Maritim

Analisis Biaya dan Waktu dengan Metode Time Cost Trade Off menggunakan Aplikasi Primavera P6

2024-07-31T01:05:41+08:00

In the construction industry, management costs and construction project time are important factors for achieving project success. Cost overruns and time delays can result in significant financial losses for project owners and contractors. Therefore, it is important to adopt an effective approach to construction management to optimize project costs and time. One method for overcoming problems in achieving construction project cost and time targets is the Time Cost Trade Off (TCTO) method. The TCTO method is an approach used in construction project management to achieve a balance between project costs and time. The analysis results show that the FO Krian Development Project, which has a normal duration of 522 days, can be accelerated to 500 days (scenario 1) and 498 days (scenario 2). Direct costs tend to increase due to additional working hours and additional workforce. The alternative used or which is more profitable in completing the project is to use scenario 2, namely additional labor due to a decrease in duration of 24 days from the normal project time and experiencing a decrease in total project costs of IDR 292,008,708.16.

Kajian Keuletan pada Beton Variasi Limbah Granit Sebagai Substitusi Parsial Agregat Kasar

2024-07-31T04:06:52+08:00

Concrete is one of the most common construction materials used throughout the world. Concrete consists of three main components: cement, coarse aggregate, and fine aggregate. Coarse aggregate serves as the main structural component in concrete, providing strength and resistance to external loads. Currently, technological advancements in construction are rapidly progressing. Therefore, innovation in concrete production is necessary, one of which is recycled aggregate concrete. The aim of this research is to determine the effect of using granite waste as a partial substitute for coarse aggregate on toughness of concrete. The method used in this research is experimental method. In this study, the variation level of granite waste used in this study was 0%; 15% ; 30% ; and 45%. The objects used for this research are blocks with dimensions of 400x100x100 mm tested using a Universal Testing Machine. The results of this research show that the toughness value obtained from the results of toughness testing on concrete with varying levels of 0% granite waste; 15% ; 30% ; and 45% respectively, namely 1.9589 kNmm; 2.2362 kNmm; 2.4189 kNmm; and 2.2118 kNmm.

Faktor Pengelolaan Operasi dan Pemeliharaan Irigasi di Kabupaten Tanah Datar

2024-07-31T09:12:43+08:00

Based on the Regulation of the Minister of Public Works and Public Housing of the Republic of Indonesia Number 14/PRT/M/2015 concerning Criteria and Determination of Irrigation Area Status, Tanah Datar Regency has 635 regency Irrigation Area authorities with a total Irrigation Area of 29,437 Ha. Over the last 5 years, the Tanah Datar Regency Government, especially the PUPR and Land Services Department, has allocated funds both from the APBN (DAK) and from the APBD (DAU) for the construction and rehabilitation of irrigation networks as well as improving irrigation networks, with the result that the irrigation conditions in Tanah Datar Regency are in good condition. good by 56.69%, in other words as many as 379 irrigation areas which were only in good condition were maintained in poor condition. The aim of this research is to determine the factors of irrigation maintenance and upkeep operations in Tanah Datar Regency by looking at six aspects of irrigation network maintenance and rehabilitation. The method used in this research is a qualitative descriptive method. Primary data was taken through interviews with informants from the Public Works and Spatial Planning and Land Service of Tanah Datar Regency, Tanah Datar Regency in the Water Resources sector, namely the Sub-coordinator of the Tanah Datar Regency irrigation Maintenance Operations. The research results show that there are 2 (two) factors that influence Irrigation Operations and Maintenance, namely (1) Condition factors of physical infrastructure and supporting facilities, (2) Personnel and institutional organizational factors of P3A.

Evaluasi Efektivitas Kinerja Instalasi Pengolahan Air Limbah (IPAL) di Kota Surakarta

2024-08-02T01:20:23+08:00

Household sewage treatment in Surakarta City depends on the performance of the available domestic wastewater treatment plants (IPAL), including Pucangsawit IPAL, Semanggi IPAL, Mojosongo IPAL, and UNS IPAL. Each of these IPAL’s serves a specific area, such as the UNS IPAL which serves the UNS area and its surroundings, the Mojosongo IPAL which is in charge of the North Area of Surakarta, the Semanggi IPAL which takes care of the South Area of Surakarta, and the Pucangsawit IPAL which serves the Central Area of Surakarta City. This research aimed at the effectiveness of the performance and development plan of each IPAL in the next 20 years. This research used descriptive qualitative and quantitative analysis methods. Qualitative descriptive analysis was conducted by observing the existing condition of IPAL Komunal in the research location. Quantitative descriptive analysis in this study was carried out by testing samples at the inlet, aeration, and outlet points of the IPAL. Based on the quality standards of the Minister of Environment and Forestry Regulation number P 68 of 2016, each IPAL. UNS IPAL is 47.27% for BOD, 73.81% for COD, 76.36% for TSS. Mojosongo IPAL is 88.71% for BOD, 76.50% for COD, 78.57% for TSS. Pucangsawit IPAL was 91.88% for BOD, 83.20% for COD, 74.82% for TSS. Semanggi IPAL is 20.45% for BOD, 69.95% for COD, 69.05% for TSS. Alternative development at the IPAL that can be done to prepare for the next 20 years is to increase the volume in the initial settling basin, aerobic biofilter basin, and also the final settling basin.

Rancang Bangun Smart System Safety Doorlock pada Kamar Crew Kapal Menggunakan Face Recognition dengan Esp32 Wrover Cam

2024-08-30T04:52:43+08:00

Security systems in the maritime sector are crucial for preventing criminal activities and theft on board ships. The physical key systems commonly used today have vulnerabilities that can be exploited by unauthorized individuals. This research aims to design and test a smart door lock system using facial recognition with the ESP32 Wrover cam and a 4x4 Keypad as an additional security measure. The test results show that the system successfully recognizes faces with a 90% success rate at a distance of 15-100 cm, although there is a decrease in efficiency when more than one face is registered. The system also demonstrated 100% success in

Penerapan Aturan P2TL pada Saat Dinas Jaga Laut Guna Menunjang Keselamatan Pelayaran di MV. Meratus Palembang

2024-08-30T06:44:57+08:00

The P2TL rule is an abbreviation for the Collision Prevention Regulation at Sea, a rule that makes it easier for ships to sail safely and avoid the danger of collisions between 2 or more ships. The aim of this research is to explain the application of P2TL rules when ships are sailing to reduce the risk of collisions between ships and create safety in navigation on MV ships. Meratus Palembang. This research was carried out using quantitative descriptive statistical research methods. With data collection techniques based on the results of questionnaires, observations, literature studies related to P2TL regulations during maritime guard duty. Then the data was analyzed using SPSS calculations and described. Based on the research results, it was concluded that the P2TL rules were applied during maritime guard duty on the MV. Meratus Palembang has complied with established procedures. This is to ensure safety at sea by preventing accidents that could result in loss of life, damage to ships, and potential environmental pollution at sea.

Rancang Bangun Sistem Keselamatan terhadap Gas CO2 dalam Ruang Penyimpanan Tabung Gas CO2 Menggunakan Raspberry Pi Pico W

2024-09-02T08:05:22+08:00

The storage space for CO₂ gas cylinders is inside the ship's accommodation, so there is a risk of danger if a leak occurs because the ship's accommodation has poor air circulation. This research is devoted to removing dangerous gases from the room. This research designs and modifies a tool that can detect CO₂ levels and can provide a danger signal to the surroundings. This modification uses a Raspberry Pi Pico W microcontroller. This research method uses system design, a series of tools with wiring design and uses 2 test plans, namely: testing static and dynamic testing. Testing the precision of the sensor by reading the CO₂ leak detector using a CO₂ measuring instrument obtained an average error value of 3.5%. The error value is still categorized as a safe difference value and the prototype works according to the expected function. Testing the function of the tool results in values for the MQ-135 buzzer and exhaust fan sensors which will turn on if the CO₂ level is above 600 ppm in accordance with the safe threshold for CO₂ levels in the air which has been set in the program. Telegram request bot testing can work well as expected. Testing the Telegram Receive bot can work well as expected. However, for testing Telegram bots, requests and receives are influenced by the internet network.

Smart Count Of Vehicle Loading Prototype pada Kapal Berdasarkan Berat Kendaraaan Menggunakan ESP32

2024-09-02T08:50:50+08:00

The primary focus of this research was to create a Smart Count of Vehicle Loading Prototype for ships, with an emphasis on monitoring and tallying vehicles boarding and disembarking from ships based on their weight. Microcontrollers, such as the ESP32, were utilized for the counting process and to determine if the ship's cargo weight exceeded its maximum capacity. The main objective was to prevent overloading on ships, which could lead to accidents during voyages or while vehicles were being loaded onto the ship. To achieve this goal, weight and distance sensors were installed on the ship and controlled by the microcontroller, allowing for accurate monitoring of the quantity and categories of vehicles being loaded. After designing and testing this prototype device, it has become a new technological innovation that makes monitoring the weight and quantity of cargo on ships easier and more efficient. This is supported by the fact that each sensor's readings can work well with an average error rate below 2%. Additionally, the maximum communication range between the Blynk IoT application and the ship system can reach up to 20 meters.

Rancang Bangun Safety Device pada Conveyor Menggunakan Arduino Mega

2024-09-02T09:06:19+08:00

Unloading equipment is equipment used to assist the process of loading or unloading cargo, such as cargo or bulk cargo from transportation facilities. One example is a conveyor, a mechanical system that can move goods. However, damage often occurs to the conveyor, so an Arduino Mega-based safety device was designed to fulfill the safety aspect. The aim of this research is to find out how to design an Arduino Mega-based safety device system for conveyor unloading equipment using the Research and Development (R&D) method. Using 2 types of testing, namely: static and dynamic testing. Arduino MEGA works fine. If the motor rotates and the conveyor moves, the conveyor is said to be working properly. The safety device on the Arduino Mega-based conveyor was made using Arduino IDE software using the C++ programming language. This safety device is able to secure the conveyor when damage occurs by cutting off the electricity when there is an overload on one of the conveyors so that the entire conveyor stops working. The conveyor series consists of a power supply, box panel, and three conveyors. After the tool has been tested and can work well, the testing is complete and the tool is ready to be used.

Pengaruh Kualitas E-Ticketing terhadap Kepuasan Konsumen PT ASDP Cabang Ketapang Banyuwangi

2024-09-04T09:46:50+08:00

The purpose of this research is to find out whether the quality of e-ticketing can provide satisfaction to consumers, what is consumer satisfaction with the services provided by e-ticketing, and to find out the effect of e-ticketing quality on consumer satisfaction at PT ASDP Ketapang Branch. The population of this study is all passengers who purchased tickets online at PT ASDP Ketapang branch, the sample used was 30 people. The data analysis techniques used are quantitative descriptive analysis techniques, simple linear regression analysis, classical assumption tests, hypothesis tests and coefficient of determination tests (R2). Based on the research results, it can be seen that the quality of e-ticketing can provide satisfaction to consumers or passengers who use ship services belonging to PT ASDP ketapang branch Banyuwangi, apart from that consumers/passengers are satisfied with the services provided by PT ASDP Ketapang branch Banyuwangi related to the existence of e-ticketing. ticketing or purchasing tickets online. Based on the calculation results, it is known that R square has a value of 0.667 or 66%. This shows the magnitude of the positive influence of E-Ticketing Quality on PT ASDP Ketapang branch , Banyuwangi (Y) is 66%, the remaining 34% is the influence of other factors.

Perawatan Kompresor Udara dalam Mendukung Kinerja Mesin Penggerak Utama di Kapal MV. Tms Glory

2024-09-09T09:36:50+08:00

Air compressor on board MV. Tms Glory has a vital role in supporting the performance of the main drive engine. This study evaluates the air compressor maintenance system through direct surveys, interviews with personnel, and document reviews. The results show that the implementation of preventive care has succeeded in reducing the risk of operational disruption. Challenges such as lack of resources for planned care were identified. Recommendations include the use of advanced condition monitoring technology and increased personnel training to support proactive care. This approach is expected to increase the operational availability of ships and reduce maintenance costs in the long term.