Accession Number : ADA133640

Title :   Diver-Operated Sediment Excavation Tool.

Descriptive Note : Final rept. Oct 80-Sep 82,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Personal Author(s) : Thomson,Hugh

PDF Url : ADA133640

Report Date : Sep 1983

Pagination or Media Count : 61

Abstract : Underwater construction tasks frequently require the removal of seafloor sand and sediment. An experimental sediment excavation tool was fabricated from commercially available and specially designed components. The diver-operated tool combined a jet-eductor, a jet nozzle, and a hydraulically powered sump pump into a jet-dredge tool to increase excavation rates, reduce reaction forces, and improve water visibility in jetting operations. A later version included multi-jet nozzles rather than a single jet nozzle. Engineering tests of the experimental tool and all candidate components were conducted. The test results are presented in this document and show that the tool is effective. The next step in development is suitable engineering design for use by Fleet units. (Author)

Descriptors :   *Dredging, *Underwater tools, Ocean bottom, Sediments, Excavation, Removal, Diver equipment, Water jets, Annular nozzles, Jet pumps

Subject Categories : Civil Engineering
      Pumps, Filters, Pipes, Tubing, Fittings & Vlvs

Distribution Statement : APPROVED FOR PUBLIC RELEASE