AQUASHIELD NOW PATENTED IN CANADA as well !
Click to view Patent Doc #02137216.....
Patent : http://Patents1.ic.gc.ca/details?patent_number=02137216
Claims : http://Patents1.ic.gc.ca/claims?patent_number=02137216

AQUASHIELD United States Patent
Leong et al.

Patent Number: 5,567,076
Date of Patent: October 22, 1996

ABSTRACT

A method of positioning a pipeline across a water-course. A first coffer dam is formed to isolate a first area of the water-course and a first part of the pipeline is then positioned in the first area. A chamber is put at the distal end of the first part of the pipeline. The chamber has an upper portion with an open top and a lower portion as opposed ports to receive the pipeline. The first coffer dam is then dismantled. A second coffer dam is formed to isolate a second area of the water-course. The second area includes the chamber. The first and second areas of the water-course are positioned to include the path of the pipeline across the water-course. A second part of the pipeline is located in the chamber and aligned with the first part of the pipeline. The ports are sealed around the pipeline. Water is removed from the chamber to allow make-up of the pipeline by joining of the first and second parts within the chamber. The upper portion of the chamber is removed and the second coffer dam is dismantled. The pipeline is then in position. The invention also extends to the chamber useful in the above method.

WELDING CHAMBER

Inventors:

Kerry Leong, Okanagan Mission;
Dennis A. Connolly, Langley,
both of Canada

Assignee:

Arthon Construction Ltd.,
British Columbia, Canada

Filed:

December 3, 1993

Primary Examiner - Michael Powell Buiz
Assistant Examiner - Fredenk L. Langman

Click to see U.S. Patent
http://www.uspto.gov/patft/

The Patent, in part, defines...

A method of positioning a pipeline across a watercourse comprising:

  • forming a first coffer dam to isolate a first area of the water-course;
  • locating a first part of the pipeline in said first area;
  • locating a chamber at the distal end of said first part of the pipeline, said chamber comprising an upper portion having an open top and a lower portion and having opposed ports to receive said pipeline;
  • dismantling said first coffer dam;
  • forming a second coffer dam to isolate a second area of the water-course, said second area including said chamber and said first and second areas of the watercourse including the path of the pipeline across the watercourse;
  • locating a second part of the pipeline in said chamber, aligned with said first part of said pipeline;
  • sealing said ports around said pipeline;
  • removing water from said chamber to allow makeup of the pipeline by joining the first and second parts within the chamber;
  • removing the upper portion of the chamber; and
  • dismantling said second coffer dam.

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