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IJOCE (International Journal of Offshore and Coastal Engineering)
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : -     EISSN : 25800914     DOI : -
Core Subject : Engineering,
Engineering
IJOCE, International Journal of Offshore and Coastal Engineering, is an academic journal on the issues related to offshore, coastal and ship science, engineering and technology. Published quarterly in February, May, August, and November.
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol 7, No 2 (2023)" : 6 Documents clear
Design and Construction of Flap Type Wave Maker Using Servo-Motor Equipped with The Reducer for Generating Waves in 3-D Wave Tank Danial, Mochammad Meddy; Panjaitan, Seno Darmawan; Lestari, Arfena Deah; Meirany, Jasisca; Suratman, Teguh; Abqari, Muhammad
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 7, No 2 (2023)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v7i2.19330

Abstract

Laboratory physical models in ocean engineering field are beneficial methods to conduct various research experiments. One of the most important equipment in the ocean engineering laboratory is a wave maker to generate and mimic the actual ocean wave. This research aims to design and construct a wave maker to generate waves on the wave tank with the dimensions of 7.5 m x 15 m x 1 m. The selected type of wave maker is a flap with hinged at the bottom, which is driven by a 3-phase motor 5 HP and gearbox reducer WPA 80 with a ratio of 1:40. The flap was connected to pulley B1-12 by shaft. There are three designs of wave maker system, i.e., stroke length of 0.5 m and the gearbox reducer with ratio 1: 40; stroke length of 0.5 m and the gearbox reducer with vbelt and pulley; stroke length of 0.05 m and the gearbox reducer with ratio 1: 40. The performance of the wave maker shows that the third design is more satisfying and suitable than the two others. However, the absorption structure must be added from both ends of the wave tank to reduce the wave reflection.
Priority Infrastructure Development on Tablolong Beach Tourism Kupang Regency - East Nusa Tenggara Johannis, Dian Erlina Wati; Trisnoyuwono, Diarto; Mata, Abia E.
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 7, No 2 (2023)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v7i2.19331

Abstract

The Tablolong beach area is one of the natural tourism objects in Kupang Regency. However, it is not matched by adequate tourist area infrastructure. This study aims to analyze the required infrastructure to assess the existing condition of infrastructure in the Tablolong beach area using a qualitative descriptive analysis, analyzing the IPA (Importance-Performance Analysis) level of importance of infrastructure in tourist areas and providing recommendations for infrastructure development directions. The results of the study indicate that the priority infrastructure developed to support the fisheries and trade services sector are 1) provision of domestic waste management facilities (laundry waste and toilets), provision of a clean water network system, provision of waste disposal sites; 2) handling potholes in road conditions and asphalting of roads that are still pavement; 3) provision of various modes of transportation and drainage systems, especially in fishing settlements and beaches; 4) provision of transportation support facilities, improvement of telecommunications performance, improvement of electricity network performance in the Tablolong Beach area under the development of the area.
Local Analysis of The Padeye-Brace Clamp Structure Strength during Installation of Riser-Spool at Offshore Platform Prastianto, Rudi Walujo; Nahar, Yusapril Hagie Syamsun; Hadiwidodo, Yoyok Setyo
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 7, No 2 (2023)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v7i2.19332

Abstract

The need for natural gas in Indonesia has developed very rapidly, thus encouraging the construction of many production support facilities. One of them is the Wellhead Platform B (WHP-B) in West Pangkah waters, East Java. This production platform is in shallow water conditions with a depth of less than 5 m and a distance of less than 5 km from the shoreline. Therefore, when the pipe installation process is carried out, a crane barge or construction vessel type cannot be used. To be able to connect the gas flow from the well to the production platform (WHP-B), it requires a supporting structure in the form of a spool and riser. The size of the spool and riser that will be installed on WHP-B is 16” and 6” with the condition that the riser and spool are connected. A crawler crane carried by a barge can be used for the installation process to occur efficiently. For the 16”-6” riserspool to be lowered simultaneously, it requires a temporary structure that serves to clamp the two pipes so that they can be installed simultaneously. This structure is a modification between the padeye and the brace clamp. The process of lowering the 16”- 6” riser-spool experienced a critical condition when it was in the splash zone. Based on the global analysis results, it is known that the UC that occurs is 0.97 with a vertical bending stress of 172.36 MPa in the 3rd padeye-brace clamp structure. After conducting local analysis on the 3rd brace clamp, it is known that the clamp structure is still in a safe condition with a maximum von Mises stress of 2.42 MPa and a maximum deformation of 0.0096 cm.
Post-Pandemic Risk Assessment and Safety Management at Academic Institution Environment Frestiqauli, Santi; Nandalianadhira, Nafisa; Hermanto, Mochammad Fathurridho; Samuel, Samuel
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 7, No 2 (2023)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v7i2.19333

Abstract

The World Health Organization (WHO), on March 11, 2020, declared the novel coronavirus (COVID-19) outbreak a global pandemic. Safety, people protection, equipment and environmental protection are serious concerns anywhere, including in an institution or university environment. In the meantime, the number of accidents has increased in academic institutions nationwide. Students, staff, lecturers, and academic personnel are involved in activities that expose them to minor to major fatal accidents. This study developed risk assessment using combinations of hazards and risk factors to scale measures in a risk reduction action plan. Health, safety and environment risk assessment conducted for 27 assessed hazardous activities at 18 locations divided into three areas: laboratories, public facilities, and offices at the Department Ocean Engineering Sepuluh Nopember Institute of Technology. The frequency and severity of health hazards were higher in accumulation number, which is 790, compared to safety hazards, which score 509, and environmental hazards, with 104. The highest number for accumulation of potential hazards in health, safety, and environment for laboratories area is 883, followed by accumulation of potential hazard at health, safety, and environment for office area and public facilities area with scores 239 and 281.
Reliability and Risk Analysis of Lubrication System on Sabuk Nusantara 43 Suardi, Suardi; Setiawan, Wira; Alamsyah, Alamsyah; Wulandari, Amalia Ika; Hidayat, Taufik
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 7, No 2 (2023)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v7i2.19319

Abstract

This study aims to present a systematic approach to evaluating the reliability of the lubrication system on the Sabuk Nusantara 43. The methods used in conducting risk assessments are quantitative methods and qualitative methods or semi-quantitative methods. In the quantitative method, the approach taken is more to the value (number) approach. Meanwhile, in the semi-quantitative method, the approach used is a qualitative approach and a quantitative approach. This method can identify potential events that not only cause disruption to pipeline operations but also events related to safety and the environment. The results showed that the biggest risk in the installation of Sabuk Nusantara 43 lubricant was found in the filter section with damage levels reaching five times in one year with risk matrix plotting in the major category (Not Acceptable) and risk control options (recommendation). Selection of filter components that are better and fulfill standards of existing rules, regular maintenance and checking, and avoiding the use of lubricating oil that is too old and used.
Bivariate Archimedean Copulas to Solve Complex Dependency in Marine Engineering Problems Ramadhani, Adhitya Ryan; Pranowo, Waskito
International Journal of Offshore and Coastal Engineering (IJOCE) Vol 7, No 2 (2023)
Publisher : Pusat Publikasi Ilmiah Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25800914.v7i2.19334

Abstract

Climate change has made offshore installations suffer severe consequences from extreme marine hazards. These offshore installations were designed to withstand extreme natural hazards. Marine natural hazards commonly occur interdependently. Thus, a multivariate model to capture this complex dependence structure is necessary. Practically, modelling marine natural hazards is usually assumed to be mutually independent or correlated by a multivariate Gaussian distribution. However, this biased assumption is not relevant to capture the real dependence structure between marine parameters. Copula functions are used to model the complex dependence structure between marine parameters. A simplified case study is selected to illustrate the modelling between wave height and wind speed. Results are compared with the traditional joint probability approach to demonstrate the advantage of copula functions. The use of copula functions provides a better result to model any complex dependence structure between correlated variables.

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