A pipeline shutoff pig for closing the interior of the pipeline in response to a radio signal includes an inflatable toroidal seal attached to the body, an inflatable cylindrical member in the flow opening of the torus, a valve for inflating the seal in response to a first signal was gas stored in the body, and another valve for venting the gas from the seal in response to a second signal.

  • Supplemental Notes:
    • U.S. Patent Classification: C1.138/97.
  • Corporate Authors:

    United States Patent Office

    2021 Jefferson Davis Highway
    Arlington, VA  United States  22202
  • Authors:
    • Barto, L B
  • Publication Date: 1969-12-16

Subject/Index Terms

Filing Info

  • Accession Number: 00056072
  • Record Type: Publication
  • Source Agency: American Petroleum Institute
  • Report/Paper Numbers: Patent
  • Files: TRIS
  • Created Date: Jul 15 1974 12:00AM