Long Range Ultrasonic Testing (LRUT)
Torsional or longitudinal guided waves are induced into the pipe body and propagated along the pipe segment being inspected. When these guided waves identify an anomaly or pipe feature their mode convert into laminar waves and reflect back to the tools original location. Using a laptop these signals are digitally captured and processed. The time-of-flight for each signature is calculated to determine the distance from the tool and the significance of the anomaly. The octants determine the position around the pipe.
For the detection of corrosion under Insulation and other metal loss flaws in piping.
The technique employs low frequency guided ultrasound, which is capable of propagation over considerable distances.
Permit extended lengths of pipe work to be examined without the need To remove large areas of insulation or wrapping. by using a pulse echo technique to transmit and receive the ultrasound at a single Location. The technique gauges percentage material loss from the depth and Circumferential extent of the defect.
Allows for volumetric examination of piping systems whether the line is insulated, buried, road crossings or high line without having to access the entire piping system. GWUT is a screening tool which detects cross sectional change in the wall thickness of the system being examined.
LRUT technology has many Benefits:
• Low cost screening with 100% coverage. • Focusing capability to evaluate corrosion around pipe circumference. • Test range under ideal conditions can achieve 300 m or more. • Testing of pipes from 1.5″ up to 48” diameter. • Reliable and accurate detection. • Ideal where conventional testing is impossible or very costly e.g. clamped, insulated, elevated, sleeved or buried pipes. • Operating Temperature -5 C to 100 C using normal modules and up to 350 C using the high temperature modules. • Inspection on insulated pipes without taking of the insulation (only where equipment will Be fixed). • Low cost screening with 100% coverage. • Focusing capability to evaluate corrosion around pipe circumference. • Test range under ideal conditions can achieve 300 m or more. • Testing of pipes from 1.5″ up to 48” diameter. • Reliable and accurate detection. • Ideal where conventional testing is impossible or very costly e.g. clamped, insulated, elevated, sleeved or buried pipes. • Operating Temperature -5 C to 100 C using normal modules and up to 350 C using the high temperature modules. • Inspection on insulated pipes without taking of the insulation (only where equipment will Be fixed).
LRUT technology has many Applications:
• Sleeved Road Crossings. • Corrosion Under Insulation (CUI). • Buried Pipe. • Wall Penetrations • Pipe Racks • Corrosion under supports • Offshore Risers and Caisson .
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