Accession Number:

AD0461146

Title:

UNDERWATER MOORING SYSTEM

Descriptive Note:

Final rept., Jul 1961-Sep 1964

Corporate Author:

NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA

Personal Author(s):

Report Date:

1965-04-07

Pagination or Media Count:

35.0

Abstract:

On 17 July 1961, a sea water environment test was initiated to determine the useful life of a 764-in.-diameter galvanized steel cable, sheathed with a 0.020 polyethylene coating. This specific work was undertaken as a part of NCEL Task NUSL-16407, Development of a Container for a Master Repeater Unit. The test cable had a proven breaking strength of 1600 pounds. The test consisted of an underwater mooring of a 32-ft-long, 20-in.-diameter cylinder with 700 lbs of positive buoyancy. This cylinder container was lowered to a depth of 130 ft at its lower end, held by the test cable attached to a 1500-lb concrete clump anchor. The design life of the test cable was six months. The container was found adrift approximately one mile from its moored position on 23 September 1964, three years and two months after installation. There are reasons to believe that the test cables useful life far exceeded its design life due to the protection against sea water corrosion of steel cable provided by polyethylene coating.

Subject Categories:

  • Couplers, Fasteners and Joints
  • Coatings, Colorants and Finishes
  • Machinery and Tools
  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE