Long range ultrasonic testing (lrut)
Long Range Ultrasonic Testing – NDT Inspection Technique
Long Range Ultrasonic Testing is an advanced technology for detecting and analysing corrosion where access is difficult.
Benefits
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.
Process
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
Applications
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
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
Contact Dexon today to learn more about how we can help you to protect your most valuable assets with certainty and save money through predictable outcomes.