Typical  Watermain Inspection Process

Preparatory Work

  • Review drawings, GIS data, ect and plan inspection route.
  • Preliminary site inspection, identify any preparatory work needed such as pumping of valve boxes, hydrant cleaning, brush clearing and any safety or access concerns.
  • Develop and approve inspection plan.

Field Work

  • Site safety inspection & briefing
  • Set-up traffic control (if required)
  • Watermain location detection (if required)
  • Measure the geometric distance between each chosen hydrant (sensor and sound source locations)

  • Set-up the base station by placing the sensor on the shut-off valve of hydrant 2 (shown on body for illustrative purposes only)
  • Connect base station to radio receiver
  • Instrument hydrant 3 with sensor and transmitter
  • Flow hydrant 1 to remove any air
  • Disinfect hydrant adapter and attach sound source to hydrant 1
  • Using an impact-hammer tap the operating nut of hydrant 1, or a valve key resting on shut-off valve
  • Observe signals at base station and adjust sensor gains
  • Record background signals
  • Possible leak locations are displayed at base station
  • Operate sound source and record

  • Close hydrant 1 and remove sound source
  • Move sensor and transmitter from hydrant 3 to hydrant 1
  • Flow hydrant 3 to remove any air and verify sound transmission to sensors
  • Disinfect hydrant adapter and attach sound source to hydrant 1
  • Tap hydrant 3 to adjust the gain on the sensors
  • Record background sound,
  • Potential leak locations are displayed
  • Operate sound source and record readings
  • Remove sound source from hydrant 3

  • Disinfect hydrant adapter and attach Thermodilatohydrometer to hydrant 3
  • Conduct  measurements with Thermodilatohydrometer
  • Remove Thermodilatohydrometer and close hydrant 3
  • This measurement is not required for each short segment
  • Remove the base station and sensors from hydrants 1 and 2.
  • (Optional) Confirm any suspected  leak locations with ground microphone.
  • (As required) Site clean-up.

Reporting

  • Analyze wall condition data using TAP software.
  • Prepare preliminary condition assessment and leak detection report formatted to customer specifications.
  • Conduct any needed validation or additional information gathering.
  • Deliver final report.