Abstract
Deep ocean water (D. O. W), m eaning water 200 m below the surface, is expected to be a new oceanic resource characterized by cool heat-source, cleanliness and nutrition of plant. Recently in Japan, some prefectural laboratories have been built for researching characteristics of D. O. W, outside of economical studies. These laboratories have been used armored polyethylene pipe as upwelling pipeline with the safety of piping under long term use. A new economical laboratory was constructed using bare hard polyethylene pipe instead of armored polyethylene pipe on solitary island “Shimokoshiki-jima” near the Satsuma Peninsula in Kagoshima prefecture. Using polyethylene pipes they developed 3rd generation products since 1990, getting excellent strength under stressful conditions compared to those of older products. Engineering works of piping were established on board ship that is easier than those of equipment using armored polyethylene pipe because of the lightness of polyethylene, using electric fuse technique for prolongation of pipe and high tolerance for bending, stretching in the field. Economical studies of abalone cultivation on land were presumed to be promotion of an enterprise using D. O. W under economical construction system. Presumed results were fruitful and showed possibilities of commercializing D. O. W.
