Accession Number : AD0845189

Title :   Influence of Lubricants and Polymer Coatings on Penetration of Oceanographic Coring Tools.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Erchul, Ronald Anton

Report Date : DEC 1968

Pagination or Media Count : 59

Abstract : The friction developed on the inner and outer faces of oceanographic coring tubes tends to decrease penetration and gross recovered length and to increase sample disturbance. An effort was made to decrease this friction through use of lubricants and polymer coatings and to thereby increase the penetration of smooth steel surfaces into fine grained sediments. Tests were conducted in the laboratory using steel plates and an Atwood test apparatus, and at sea using gravity corers. In the laboratory tests the lubricants STP, CRC, zinc grease, and lithium grease increased penetration 46, 25, 24, and 20 percent respectively. Tests at sea showed that use of STP lubricant increased corer penetration 18 and 35 percent and gross recovery length of cores 16 percent. Statistical analysis indicated that the above increases were highly significant. Teflon, FEP film, and nylon increased penetration 20 to 30 percent in the laboratory and merit special consideration since these coatings would not contaminate the core sample. (Author)

Descriptors :   *LUBRICANTS), (*COATINGS, MACHINE TOOLS), (*DRILLING MACHINES, POLYMERS, FRICTION, PENETRATION, SURFACES, PIPES, HALOCARBON PLASTICS, STATISTICAL ANALYSIS, NYLON, SEDIMENTATION, CONTAMINATION, OCEAN BOTTOM SAMPLING, GREASES, SOIL MECHANICS, THESES, SHEAR STRESSES.

Subject Categories : Coatings, Colorants and Finishes
      Lubricants and Hydraulic Fluids
      Machinery and Tools
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE