Long Range Ultrasonic Testing (LRUT)

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

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