Long Range Ultrasonic Testing is an advanced technology for detecting and analysing corrosion where access is difficult.


  • Low cost screening with 100% coverage
  • Focussing capability to evaluate corrosion distribution around pipe circumference
  • Typical test range 60m from single location, ideal conditions can achieve longer distance.
  • Testing of pipes up to 48” diameter
  • Proven capability on pipe in service up to 125 oC
  • Detection of metal loss > 3%
  • Ideal where conventional testing is impossible or very costly e.g. clamped,insulated, elevated, sleeved or buried pipes.


  • Low frequency ultrasound is transmitted and received from a single location
  • The guided waves used travel long distances, even in buried, submerged or insulated pipe
  • Reponse from flaws is a function of their depth and circumferential extent
  • Focussing allows ultrasound energy to be concentrated into a small region of pipe for detailed localised inspection
  • Teletest® uses ‘multi-mode’ technology to characterise and quantify any flaw detected
  • A laptop PC runs dedicated Teletest® data acquisition and analysis software. The flaw detector communicates with the PC via a high-speed data link


Pipe types

  • Seamless
  • Longitudinally and spiral welded

Pipe materials

  • Ferritic and stainless steels
  • Other metals

Pipe situations

  • Buried
  • Air-to-soil interface
  • Air-to-water interface
  • Elevated on racks
  • Sleeved in road crossings
  • Wall, bund or berm penetrations

Flaws found

  • External corrosion
  • Corrosion under insulation (CUI)
  • Internal corrosion or erosion

Pipe coatings etc.

  • Foam or mineral wool
  • PVC, epoxy, coal tar epoxy
  • Paint
  • Bitumastic wrapping

Pipe coatings etc.

  • Transmission and distribution lines
  • Refinery and Chemical plant
  • Offshore risers
  • Jetty lines
  • Tank farm link lines
  • Power plant service pipe
  • Storage sphere support legs
  • Headers