Toru Kagoura, Ken'ichi Ishii, Satoru Abe, Tetsuo Inoue, Takayoshi Hayashi, Takashi Sakamoto, Takashi Mochizuki and Tomohiro Yamada
Pipe-in-pipe technology has been implemented, whereby pipes of one continuous length are laid individually in the existing submarine pipelines belonging to petrochemical complexes in various locations across Japan to construct renovated networks for fluid transportation. Because the pipelines have a number of sharp bends, development of a new pipe with excellent flexibility and lightweight was required to construct such a network. Thus Furukawa Electric, Nippon Steel, and Idemitsu Kosan have jointly developed the pipe thereby succeeded in acquiring a special certification as a flexible pipe for transportation of high-pressure liquefied petroleum gas. The developed pipe has been successfully laid in the existing submarine pipeline (3.3 km in total length) in the Tokuyama Refinery of Idemitsu Kosan in July 2002.