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SS MANHATTAN TESTS. A REVIEW OF THE ICE PROGRAM

The U.S. Army Cold Regions Research and Engineering Laboratory was contracted by Humble Oil company to formulate and supervise the ice testing aspects of their Arctic Tanker Tests aboard the SS Manhattan. Since the prime purpose of the entire Test Program was to derive thrust and resistance values for varying ice types, USACRREL's responsibility was clearly to define the ice conditions encountered. While the ship was underway in ice, a continuous description (log) of ice conditions, speed, propeller rpm, etc. was maintained. For formal tests ice thickness was measured at adequate intervals to define the sheet over the test section. Total channel width, size of cusps and other parameters were also noted. The major effort for formal tests was to measure the ice strength which was done primarily to enable comparison of tests in floes of equal thickness. Temperature and salinity profiles of the ice sheet were taken which could be used indirectly to measure ice strength. Brazil tensile tests were made to measure the strength directly but, as with all small sample ice testing, there was a large scatter in the results. A least square fit of the Brazil data vs brine volume as determined from the temperature salinity measurements gives the following relationship: Brazil tensile strength in kg/cm squared equals 4.82 minus 5.68 times the square root of the brine volume. To compare the strength of one sheet to another for purposes of correlating ship's tests it appears that brine volume measurements should be used rather than small sample tests. Although the relationship between brine volume and strength is not precisely known there is far less scatter in the brine volume measurements.

  • Supplemental Notes:
    • Abstract of paper delivered at the First International Conference on "Port and Ocean Engineering under Arctic Conditions" held at Trondheim, Norway, August 23-30, 1971
  • Corporate Authors:

    POAC Conference

    ,    
  • Authors:
    • Den Hartog, S L
  • Publication Date: 1971

Subject/Index Terms

Filing Info

  • Accession Number: 00025701
  • Record Type: Publication
  • Source Agency: Arctic Institute of North America
  • Files: TRIS
  • Created Date: Mar 28 1972 12:00AM