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This study estimated availability of an air compression system and a nitrogen generation system in liquefied natural gas—floating production storage and offloading unit (LNG-FPSO) with different design stages to investigate the gap between the availability at the early design stage and that at the late design stage. Although availability estimation in the early design stage is more important than the late design stage, it is difficult to estimate the availability accurately in the early design stage. The design stage was divided into three depending on the design progress. Monte Carlo simulation technique was employed for the availability estimation. The results of the availability estimation showed that there was 0.434% difference between the early and late design stages. This meant that the availability in the early design stage was underestimated due to limited information. A sensitivity analysis was performed to investigate critical factors affecting the results. The investigated factors were failure rate, repair time, redundant equipment, and modified preventive maintenance schedule. The most critical factor was redundant equipment. It increased 0.486% availability.
Youngkyun Seo; Jung-Yeul Jung; Seongjong Han; Kwangu Kang. Availability Estimation of Air Compression and Nitrogen Generation Systems in LNG-FPSO Depending on Design Stages. Applied Sciences 2020, 10, 8657 .
AMA StyleYoungkyun Seo, Jung-Yeul Jung, Seongjong Han, Kwangu Kang. Availability Estimation of Air Compression and Nitrogen Generation Systems in LNG-FPSO Depending on Design Stages. Applied Sciences. 2020; 10 (23):8657.
Chicago/Turabian StyleYoungkyun Seo; Jung-Yeul Jung; Seongjong Han; Kwangu Kang. 2020. "Availability Estimation of Air Compression and Nitrogen Generation Systems in LNG-FPSO Depending on Design Stages." Applied Sciences 10, no. 23: 8657.
This study investigated the corrosion resistance of oil impregnated anodic aluminum oxide (AAO) surfaces of aluminum 7075 for subsea application. Although aluminum 7075 has high strength, it is scarcely used in the subsea industry because of its corrosion issue. Some treatment of aluminum 7075 is required for subsea application. In this study not only a plate shape but also a cylindrical shape were investigated because a cylindrical shape is frequently used in the subsea industry for electronic device housing. Contact angles of bare aluminum and oil impregnated AAO surfaces of aluminum 7075 were measured after a salt spray test and a pressure test. The results showed that the contact angle of bare aluminum was considerably decreased after the salt spray test, whereas the oil impregnated AAO surface presented a relatively high contact angle after the salt spray test and the pressure test. These results showed that the corrosion resistance of aluminum 7075 could be enhanced by oil impregnation on the AAO surface, and thus can be utilized in the subsea industry.
Youngkyun Seo; Jung-Yeul Jung; Jihoon Chung; Sangmin Lee. Enhancement of Corrosion Resistance of Aluminum 7075 Surface through Oil Impregnation for Subsea Application. Applied Sciences 2019, 9, 3762 .
AMA StyleYoungkyun Seo, Jung-Yeul Jung, Jihoon Chung, Sangmin Lee. Enhancement of Corrosion Resistance of Aluminum 7075 Surface through Oil Impregnation for Subsea Application. Applied Sciences. 2019; 9 (18):3762.
Chicago/Turabian StyleYoungkyun Seo; Jung-Yeul Jung; Jihoon Chung; Sangmin Lee. 2019. "Enhancement of Corrosion Resistance of Aluminum 7075 Surface through Oil Impregnation for Subsea Application." Applied Sciences 9, no. 18: 3762.