A variable buoyancy pipeline system consists of a multiconduit pipeline which weighs less per unit cross-section than water when empty and which has its buoyancy controlled by the specific gravity of the transported materials. A pair of spaced pigs are placed slidably in one of the conduits to define an air-tight chamber; a device moves the pigs along the conduit so that the buoyancy is increased in a selected portion, e.g., to raise it to the surface for inspection or repair. The chamber is filled with a fluid having a specified gravity less than that of water.

  • Corporate Authors:

    American Petroleum Institute

    1220 L Street, NW
    Washington, DC  United States  20005-4070
  • Publication Date: 1970-3-11

Subject/Index Terms

Filing Info

  • Accession Number: 00056114
  • Record Type: Publication
  • Source Agency: American Petroleum Institute
  • Report/Paper Numbers: Patent
  • Files: TRIS
  • Created Date: Jul 15 1974 12:00AM