Inserting a steel and ductile iron pipeline inside a 6-mi (9.7-km) stretch of 30-year-old water pipeline enabled the Seattle Water Department to rehabilitate the damaged line in three months. Each 20-ft (6-m) and 40-ft (12-m) length of inner steel pipe was welded spirally and coated inside with cement mortar before being positioned in the inner pipeline. Each pipe section was then connected to the adjoining pipe section by a fillet weld technique performed at the pipeline site. A mortar grout filled the space between inner and original pipelines. The carrier of the inner pipe units was winch-pulled by cable or self-powered through the old pipeline to deliver steel or ductile iron liners to their proper locations, positioning them for pipe-to-pipe welding.

Media Info

  • Features: Photos;
  • Pagination: p. 10
  • Serial:
    • APWA Reporter
    • Volume: 56
    • Issue Number: 8
    • Publisher: American Public Works Association
    • ISSN: 0092-4873

Subject/Index Terms

Filing Info

  • Accession Number: 00486642
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 31 1989 12:00AM