| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.15 ( October 1986 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Installation of Oxygen Submarine Pipeline in Mizushima Port Satoshi Maeda, Akio Yokoyama, Shinsuke Sakai |
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Synopsis : In the installation work of the oxygen pipeline from Mizushima Works of Kawasaki Steel to Okayama Works of Tokyo Steel Mfg. Co., Ltd., a submarine pipeline was installed in the Mizushima Port by the floating two method after various studies. A long and deformed pipeline was prefabricated on land according to specifications, equipped with floaters, launched, towed, and then sunk simultaneously at the time. The pipeline consists of the service pipe whose nominal diameter is 200 mm and the steel jackets whose nominal diameter is 300 mm. The earth-covering thickness for the pipeline is 3 m. In design, the safety of the pipeline was especially confirmed by the dynamic analysis of expected stress of the pipeline during earthquakes. A large backhoe dredger equipped with spuds was applied for excavation of the seabed in order to remove hard sandy soil efficiently, and safety provisions, for example, large guardships, were sufficiently provided. |
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