Patents Assigned to ST Environmental Services
  • Method for the cleaning of water mains
    Patent number: 5915395
    Abstract: A method of cleaning water mains includes isolating a section of water main. Compressed air is then used to blow out the water within the water main. The water main is actually cleaned by interspersing slugs of water between sections of compressed air. The compressed air includes atomized chlorine and a polyphosphate inhibitor. Once the water main has been cleaned, the flow of water is returned to the isolated section.
    Type: Grant
    Filed: May 28, 1997
    Date of Patent: June 29, 1999
    Assignee: ST Environmental Services
    Inventor: Ronald S. Smith