Acoustic and Backscatter Tomography

Acoustic Pipe Inspection (API):

Acoustic (knock) testing involves striking the pipe and identifying anomalous regions of undermining or voiding by sound to locate and characterize the pipe, based upon the sound of flowing water.

API features include:
  • Can be active or passive, internal or external, use automated and remote data collection, and the inspection can be continuously monitored in real time.
  • Useful as a screening tool when used in conjunction with visual inspection for first tier screening.
  • Can help pinpoint areas for diagnostic BCT imaging.

Acoustic Pipe Inspection can locate leaks and quantify the scale of a leak at first reading – saving time and resources.

Backscatter Computed Tomography (BCT):

BCT imaging is essentially a CAT scan for infrastructure – a form of industrial diagnostic imaging to enhance the understanding of structural soil conditions around Corrugated Metal Pipe (CMP) assets.

BCT features include:
  • Creates a relative map of density, which allows the system to distinguish between materials of different densities and map their location.
  • Addresses the challenges of inspecting CMPs, and allows a full structural condition assessment –the only non-destructive method for imaging in-situ soil voids and undermining around CMPs.
  • Acquires measurements with the field hardware and transmits information to the head and office for image reconstruction and report generation.
  • Tier 1 screening excludes structurally sound pipes from Tier 2 screening. Assets requiring further investigation into their structural condition undergo Tier 2 assessment.
  • Applied to CMP structures, BCT is able to image and distinguish between the CMP wall, supporting soil and voids.
  • Offers descriptive, conclusive, and quantifiable evidence of the condition of the pipe’s supporting soil without damaging the pipe wall.
  • Can be used in asset management programs, rehabilitation planning, safe replacement or deferral, and post construction QA/QC.
  • Suited to evaluate corrugated metal, plastic, and composite pipe (lined or coated) in nominal diameters 900mm and larger.
  • A robust solution, failure modes, soil stability, and grout placement can be accurately visualized and understood.
  • Meets performance specs of a new installation and exceeds performance specs of the original installation.
  • Tackles unseen cues of structural deficiency representing an information gap, including undermining, soil movement, piping, and void formation.
  • Enhances culvert rehabilitation.

BCT optimizes individual rehabilitation projects, as well as long-term asset management and rehabilitation planning of CMP assets. By assessing pipe problems “trenchlessly” as opposed to digging them up, BCT can yield cost savings of over 50%.