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윤병만,서정필,노영신 한국수자원학회 2001 한국수자원학회논문집 Vol.34 No.6
본 연구에서는 군말뚝 교각 주위에서의 세굴특성을 실험을 통하여 파악하였다. 실험은 4개, 9개, 15개, 35개의 파일로 구성된 군말뚝에 대해 수행하여 파일수, 유속, 접근각에 따른 세굴형상, 최대세굴심의 깊이 및 위치의 변화를 살펴보았다. 실험결과에 의하면, 4개 및 9개로 구성된 군말뚝의 경우 유속비와 상관없이 단일교각의 최대세굴심과 흡사하였고, 15개와 35개로 구성된 군말뚝의 경우 유속비가 증가함에 따라 최대세굴심도 급격히 증가하여 단일교각 세굴 This study analyzed the general scour characteristics around group pile foundations through laboratory experiments. The experiments were performed for the pile groups consisting of 4, 9, 15 and 35 piles to investigate the effects of pile number, mean velo
A study on corrosion of distance piece on Exhaust Gas Cleaning Systems (EGCS) discharge water line
박인영,노정필,윤용섭,양정현 한국마린엔지니어링학회 2020 한국마린엔지니어링학회지 Vol.44 No.6
An exhaust gas cleaning system (EGCS) is a requisite in ships for complying with the IMO 2020 global sulfur limit requirements. However, corrosion in the distance piece between the EGCS overboard valve and ship hull can cause a large amount of seawater to enter the engine room. Although the distance piece is constructed according to an approved design employing steel piping with an epoxy coating, acidic wash water still comes into contact and reacts with the steel pipe. This is most likely caused by a defect in the epoxy coating or damage to the coating incurred during pipe installation. The results of this study show the importance of maintaining cleanliness during surface treatment and proper painting thickness during pipe installation. This study focuses on the importance of selecting the correct design and appropriate materials for the EGCS discharge water distance piece.