Acoustic Pulse Reflectometry for Tube Inspection


Acoustic Pulse Reflectometry is a Non-Destructive Testing (NDT) technology that sends sound pulses through air medium and measures any ensuing reflections.

  • Any change in the cross sectional area in the tubular system creates a reflection.
  • Reflections are created by defects in the tube
  • Each defect has its own signature and our patented algorithms identify and report location, type and size of defects

Uniqueness of APRIS:

  • Non Invasive (uses only sound waves)
  • Applicable for any shape or configuration (Straight/ multiple bend, finned, coiled, spiral, helical tubes etc.,)
  • Inspect any tube materials (Ferrous, Non-ferrous, graphite, composites etc.,)
  • Ultrafast inspection (Less than 10 seconds per tube)
  • Easy to use
  • Sophisticated algorithm to identify precise location, type and size of defects
  • Intuitive software with artificial intelligence to generate reliable and quality report
  • Seamless communication with portal to enhance user interactions

APR (Acoustic Pulse Reflectometry) Signatures:

Pre requisites to carry out APR Inspection:

  • Tubes to be cleaned and dried (No water stagnation)

Limitations of APR:

  • Defects in the outer diameter can’t be detected
  • Inept to detect the defects under deposits/scales
  • Cracks under pressure (Closed Cracks) shall not be detected

International Standards:

  • ASTM E2906/E2906M-13: Standard Practice for Acoustic Pulse Reflectometry Examination of Tube Bundles
  • ASME BPVC.V-2017: Article 18-Acoustic Pulse Reflectometry (APR) Examination

Comparison Study-APR Vs ECT
Comparison of Technologies