The program was conducted to improve an existing leak-plugging system, designed for plugging underwater holes up to 0.1 meter (4 inches) in diameter, and to modify it to satisfy the requirements for use by Coast Guard pollution response personnel. Eight prototypes of the external leak plugger were fabricated and extensively tested, both in the laboratory and in the field, the latter by Coast Guard Strike Team divers. The reliability of the device was verified. It was used to adequately plug holes well beyond the design limits and within seconds of activation by an operator. Aspects of satisfactory plug formation were thoroughly investigated, resulting in dramatic improvements in the applicator tip design. A larger-scale loading system for formulating significant quantities of polystyrene foam and for loading individual devices with the premixed foam was developed and used. A large plug feasibility study showed no insurmountable engineering problems precluding the development and use of a scaled-up leak-plugging system. A detailed analytical investigation of sizing requirements, loading requirements, and environmental considerations produced a recommended system configuration with a high probability for system success. A system integration study furthered the production and deployment of the external leak plugger by selecting the optimum leak plugger shipping configuration, determining the most cost-effective approach for producing the external leak plugger in quantity, filing a formal application with the DOT for exempting the loaded device from certain shipping regulations, and preparing a training program. (Author)

  • Corporate Authors:


    CEDAR RAPIDS, IA  United States 
  • Authors:
    • Melvold, R W
    • Tu, W H
    • Smith, G H
  • Publication Date: 1979-12

Media Info

  • Pagination: 145 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00326234
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: EMSC8316.1FR, USCG-D-30-80
  • Contract Numbers: DOT-CG-81-78-1817
  • Files: NTIS
  • Created Date: Dec 11 2003 12:00AM