. Deep-ocean biodeterioration of materials. Materials; Marine sediments. â «^^ Figure 23. Plastic electrical insulation tape wrapped around plastic rods. The burlap wrappings (Figure 24) on all the plastic rods and tubes were deteriorated by bacterial action, and the material could easily be torn apart by hand. The rubber electrical tape wrappings were not affected by fouling organisms although there were hydroids and sponges growing on the rubber material. Slight cracks (Figure 25) were found on the rubber and were probably produced by the effects of the deep-sea environment. Insu
. Deep-ocean biodeterioration of materials. Materials; Marine sediments. â «^^ Figure 23. Plastic electrical insulation tape wrapped around plastic rods. The burlap wrappings (Figure 24) on all the plastic rods and tubes were deteriorated by bacterial action, and the material could easily be torn apart by hand. The rubber electrical tape wrappings were not affected by fouling organisms although there were hydroids and sponges growing on the rubber material. Slight cracks (Figure 25) were found on the rubber and were probably produced by the effects of the deep-sea environment. Insulation on No. 16 Wire. The 15-inch-long nonstressed (straight) wire specimens were lost because the plastic cable clamps which held them to the phenolic laminated sheet were severed;-however, the stressed (coiled) wire specimens were recovered (Figure 26). In the laboratory, the insulations were examined under a stereoscopic microscope for signs of any deterioration. Electrical tests, such as insulation resistance and voltage breakdown tests, were also conducted on these specimens. The results of the electrical tests are presented in Table 10. The entire surface area of the silicone rubber insulation was roughened, and the thickness of the insulation was reduced considerably by the nibbling and chewing action of some marine organisms (Figure 27). The surfaces of other insulations, such as polyvinyl chloride, polyethylene. Government rubber styrene (GR-S), and neoprene rubber, were not affected. However, there were deep cracks in one area of a neo- prene rubber insulation (Figure 28), exposing the conductor to seawater. The insulation was exposed about 3 feet above the sediment. 31. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Muraoka, James S; Naval Civil Engineering Laboratory (Port Hueneme, Calif. ).
Size: 937px × 2667px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
