Installation Of A Deep-sea Water Supply System For Mariculture

A system was installed of pumping 460 m3 per day of deep-sea water from a depth of 320 m to shore for cultivating fish, shellfish, and algae. The material and the installation method were tested of a deep-sea water pipe. The particularly severe wave conditions that exist during a typhoon at the system site pose unique problems. It was determined that the most suitable material for a deep-sea water pipe was high-density polyethylene with steel wire armor, and that the reel-barge method was optimal for laying this pipe. Laying work was done accurately in a short period (two days). It was found that laying high-density polyethylene pipe with a steel wire armor by the reel-barge method was the best combination for construction of a deep-sea water supply pipeline. Before laying work, it was predicted that approximately 5 % of the total pipe was necessary for extra pipe because of possible errors during laying. During actual laying work, the pipe length was found to be practically equal to a designed pipeline length.