PERANCANGAN DAN ANALISIS BOAT IMPACT ANJUNGAN LEPAS PANTAI TIPE JACKET TRIPOD DI PERAIRAN SELAT MAKASSAR
Alesha Zahira Khairunnisa dan Prof. Dr. Ir. Ricky Lukman Tawekal
Program Studi Teknik Kelautan
Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung,
Jl Ganesha 10 Bandung 40132
1alesha@students.itb.ac.id dan 2ricky@ocean.itb.ac.id
ABSTRACT: By the end of 2020, investment in the oil and gas sector in Indonesia had only reached 59% of the total target of US$13.8 billion. Although the investment trend tends to decline, in 2021 the investment target is still targeted to reach US$18 billion. This is due to the large demand from the public for processed oil and gas products such as fuel and LPG. Of course, to increase production to meet the demands of the community, an offshore platform facility that is safe and robust against various operational and environmental conditions at the drilling site will be required so that production activities can be accommodated properly. In accordance with the API RP 2A WSD 21st edition design standard code, several design criteria must be met for an offshore platform structure to be declared suitable for use.
This final project will be carried out by modelling the structure of an offshore platform with the type of fixed platform jacket tripod in the Makassar Strait. The modelled structure includes the main structure and sub-structure of the boat landing. The main structure must be able to meet the criteria for in-place, seismic, and spectral fatigue analysis. Meanwhile, the boat landing design will be made based on a specific design criterion, where the structure elevation will be based on water depth and also tested with boat impact and collapse analysis. Boat impact analysis is carried out to determine the capacity of the boat landing to absorb energy due to the impact of the designed ship’s berthing. The boat landing structure must not collapse when hit by the ship when berthed and must be able to absorb the kinetic energy of the ship when it hits the structure. As an approach to real conditions, a boat impact analysis was carried out on the structure consisted of 9 (nine) impact cases using a 1600-Ton ship with a speed of 0.5 m/s. The division of cases is carried out by taking into account the depth of the waters, the part of the ship that hit the ship, and the part of the landing boat that was pounded by the structure. The magnitude of the collision energy that occurs due to the ship docking is 220 kJ for the bow section of the ship and 280 kJ for the broadside collision of the ship. Based on the calculations, for the case of a ship collision, the amount of energy that must be absorbed by the boat landing structure is 199.1184 kJ for the collision of the bow of the ship and 92.0656 kJ for the collision of the broadside of the ship. Based on the results of the boat impact analysis, the boat landing is declared to be able to absorb energy due to the collision of a 1600-Ton ship when docked without undergoing plastic deformation or collapse. Checking the capacity of the boat landing structure was also carried out using boat impact analysis and the maximum capacity of the structure to absorb the ship’s central bow impact was 3380.3 kJ. Then the maximum capacity of the structure to absorb the ship’s broadside impact energy is 438.50 kJ, and the maximum capacity of the structure for the case of sideway bow impact is 3871.9 kJ.
Keywords: Platform design, In-Place, Seismic, Spectral Fatigue, Boat Impact, Plastic Collapse
Loading...
Reload document 
Open in new tab