Underwater

Underwater

Ecotoxicological assessment of underwater welding impact during the construction of marine pipelines

Published in Vladimir Litvinenko, Advances in Raw Material Industries for Sustainable Development Goals, 2020

K.Y. Kirichenko, K.S. Pikula, A.M. Zakharenko, A.V. Gridasov, S.G. Parshin, S.A. Medvedev, I.A. Vakhniuk, K.S. Golokhvast

The practical application of underwater welding is complicated by several factors, including poor visibility, which in turn makes it difficult to make butt joints as the welding path is easily lost. In this regard, during the experiment, a fillet weld of lap joint was performed, and the edges of plates were used as guides for the electrode.

Numerical and Experimental Study of Reciprocating Seals in Seawater Hydraulic Variable Ballast Components for 11,000-m Operation

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Journal Information

Published in Tribology Transactions, 2023

Defa Wu, Yunxiang Ma, Zhenyao Wang, Hao Min, Yipan Deng, Yinshui Liu

Seawater hydraulic components utilize natural seawater as the working medium, with the advantages of no pollution, high environmental adaptability, and low cost (1, 2). Therefore, it is suitable for ocean engineering and has been widely used in underwater operating systems, such as underwater manipulators, autonomous underwater vehicles (AUVs), deep-sea mining tools, and so on (3–5). Reciprocating seals are critical in hydraulic systems and play a key role in isolating the external environment and working medium (6, 7). Research on reciprocating seal performance helps to improve the operating efficiency of the seawater hydraulic variable ballast system (SHVBS) and guide the structural optimization of the components. However, because of the complexity of seal behavior and material research, the mechanism of reciprocating seals cannot be fully explained.

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Ecotoxicological assessment of underwater welding impact during the construction of marine pipelines

Numerical and Experimental Study of Reciprocating Seals in Seawater Hydraulic Variable Ballast Components for 11,000-m Operation