White Rock North, Water Transmission Main Failure Investigation

Dallas, TX

Completion

2002
White Rock North, Water Transmission Main Failure Investigation
White Rock North, Water Transmission Main Failure Investigation

The White Rock North Water Transmission Main is a 17 mi, 84 in. dia. prestressed concrete cylinder pipeline, embedded cylinder type, which delivers approximately 200 million gallons per day of treated water. SGH was hired as a subconsultant to Halff Engineers to perform a failure investigation of the transmission main after a pipe segment ruptured.

Scope | Solutions

SGH performed a failure investigation involving the following:

  • Hydraulic analysis
  • Soil and geotechnical tests
  • Corrosion potential surveys
  • Stress analysis of pipe
  • Chemical and petrographic analysis of mortar coating
  • Scan electron microscopy/energy dispersion spectroscopy of mortar coating
  • Mechanical testing and metallurgical analysis of prestressing wire and steel cylinder
  • Inspection of failed and adjacent pipes

SGH also determined that carbonation of the mortar coating was extensive and variable around the pipe circumference and that the likely primary cause of the rupture of the pipe was carbonation of the mortar coating from acidic groundwater.

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