TY - JOUR T1 - A Long Gravity-Piston Corer Developed for Seafloor Gas Hydrate Coring Utilizing an In Situ Pressure-Retained Method A1 - Chen,Jia-Wang A1 - Fan,Wei A1 - Bingham,Brian A1 - Chen,Ying A1 - Gu,Lin-Yi A1 - Li,Shi-Lun AD - Zhejiang Univ, Ocean Coll, Hangzhou 310058, Peoples R China. AD - Univ Hawaii, Dept Mech Engn, Honolulu, HI 96822 USA. AD - Hangzhou Dianzi Univ, Dept Ocean Engn, Hangzhou 310018, Peoples R China. AD - Zhejiang Univ, State Key Lab Fluid Power Transmiss & Control, Hangzhou 310027, Peoples R China. UR - https://archimer.ifremer.fr/doc/00264/37516/ DO - 10.3390/en6073353 KW - gas hydrate corer KW - in situ pressure-retained corer KW - mechanism of coring KW - long coring KW - gravity-piston KW - key pressure-retained structure N2 - A corer, which can obtain long in situ pressure-retained sediments of up to 30 m core containing gas hydrates, has been applied in the South China Sea (SCS) dozens of times. The corer presented in this paper is a convenient, efficient and economical long in situ pressure-retained coring and research tool for submarine sediments, that can applied to completely cope with all sediments close to the seafloor ranging from shallow waters to the deep sea depths of 6000 m. This article mainly presents the overall structure, working principles, key pressure-retained components, coring mechanism, sea trials and outlook of the corer. The analyses found that the coring ability was affected by formation characteristics, the outer diameter of the core barrels and inner diameter of the core liners, the shapes of the cutter and the dead weight of the corer. This study can provide the practical basis for the structural optimization of this type of corer and designs for corers with greater penetrability. Sea trials showed that the developed corer presented in this paper can support the in situ pressure of the seafloor sediment core, which is an improvement over the conventional piston corer. Y1 - 2013/07 PB - Mdpi Ag JF - Energies SN - 1996-1073 VL - 6 IS - 7 SP - 3353 EP - 3372 ID - 37516 ER -