Accession Number : ADA306391

Title :   Deep-Ocean Biodeterioration of Materials. Part 6. One Year at 2,370 Feet.

Descriptive Note : Final rept. Feb 65-Aug 66,

Corporate Author : NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Personal Author(s) : Muraoka, James S.

PDF Url : ADA306391

Report Date : MAY 1967

Pagination or Media Count : 66

Abstract : As Part VI of a series of reports on the biological deterioration of materials in the deep ocean, this report covers the data obtained after exposing metallic and nonmetallic specimens for 03.4 months on the floor of the Pacific Ocean at a depth of 2,370 feet (Test Site II). The specimens were attached to a Submersible Test Unit that was emplaced in April 0965 and retrieved in May 1966. Preliminary examination of the specimens was made abdard ship, and the final examination, tests, and analyses were performed at the Naval Civil Engineering Laboratory. On recovery, most of the plastic materials and all of the rope specimens were covered with bacterial slime. Cotton and manila rapes were severely deteriorated by marine microorganisms. Wood panels, certain plastics, and manila ropes were attacked by molluscan borers. Some of the plastics were attacked by borers directly from seawater environment without the aid of wood bait pieces. Hydroids and tubeworms were found on metal panels. Sea anemone, snails, and crabs were also found attached to various test panels. The surface of a silicone rubber electrical cable insulation was deteriorated by same marine organisms. Typical fouling organisms such as barnacles and bryozoa were not found. Glass, elastomers, and certain plastics were not adversely affected. Data from evaluation of these specimens are presented.

Descriptors :   *METALS, *NONMETALS, *MARINE BIOLOGY, *DEEP OCEANS, *MICROORGANISMS, *BIODETERIORATION, TEST AND EVALUATION, ENVIRONMENTS, BACTERIA, MATERIALS, PANELS, ELASTOMERS, ROPE, PACIFIC OCEAN, AQUATIC ORGANISMS, PLASTICS, SEA WATER, BARNACLES, WOOD, FOULING ORGANISMS, SUBMERSIBLES, SNAILS, COTTON, CRABS, POLYCHAETA, SLIME.

Subject Categories : Biochemistry
      Biological Oceanography
      Metallurgy and Metallography
      Elastomers and Rubber

Distribution Statement : APPROVED FOR PUBLIC RELEASE