Last update: Jan 13, 2017
Long Range Ultrasonic Testing (LRUT) is an advanced nondestructive examination technique that was developed for testing large volumes of material from a single test point. What differentiates this from more traditional methods of ultrasonic testing is that, with LRUT, a liquid couplant between transducers and the surface is not required. For this reason LRUT is one of the fastest inspection tools for carrying out pipeline surveys for corrosion and other damage mechanisms.
LRUT is performed using a system which is made up of a low frequency flaw detector, a pulser receiver unit, some transducer rings, and a laptop computer which contains the software that controls the system. To begin, the transducer rings are fixed around a pipe, through which they will then generate a series of low frequency guided waves. It's the uniform spacing of the ultrasonic transducers around the circumference of the pipe allows for the guided waves to propagate symmetrically along the pipe axis, providing complete, 100% coverage of the pipe wall, including areas such as at clamps and sleeved or buried pipes. The waves are then reflected back to the transducer whenever they reach a change in wall thickness, which is how the process is able to detect corrosion, metal loss, or discontinuities.
LRUT is an invaluable nondestructive examination technique that has applications throughout the oil and gas industry. It is widely used in the inspection of pipes in areas such as road and river crossings, power plant tubing, risers, offshore topside pipework, jetty lines, and refinery pipework for the detection of issues such as corrosion under insulation. It has also found widespread use in situations where pipes or tubes are not accessible to other detection methods such as for pipes buried in soil, those encased in a sleeve, or those positioned at a high elevation.
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November/December 2016 Inspectioneering Journal
By Adam Gardner at PinnacleART
Beyond the financial hits, undetected degradation from corrosion can also lead to critical safety risks. To effectively manage mechanical integrity, organizations need reliable methods of identifying the current states of corrosion occurring within their assets.
May/June 2016 Inspectioneering Journal
By Borja Lopez at Innerspec Technologies, Inc.
In the last few years, electromagnetic acoustic transducer (EMAT) has come to prominence for its ability to quickly scan exposed pipelines for corrosion, cracks, and other defects using medium-range guided waves and without the requirement for liquid couplants.
June 1, 2015
Nondestructive Testing (NDT) makes up the majority of testing performed in our industry. There many different types of nondestructive testing techniques. Each method has its own advantages and disadvantages; each can detect different types of flaws. Some are simple to perform, others are difficult. Some are used on several different types of equipment, others are more restricted.
February 2, 2015 By John Reynolds at Intertek
The development of advanced NDE techniques/tools is one of the reasons the inspection trade has taken significant steps forward in the last couple decades; and the advancements appear to be accelerating. One of the many ways to keep up with advancing NDE technology is to attend the semi-annual NDE task group meetings at the Spring and Fall API Refining and Equipment Standards Meetings. In fact, that T/G is planning to document many of the advanced NDE...
It is difficult to cover all inspection applications with basic inspection procedures like radiography, ultrasonics, magnetic particle testing, and dye penetrant inspection. Owner-operators are finding that advanced NDE services such as guided-wave ultrasonics, AUT corrosion mapping, and eddy current testing are essential tools to keep their facilities operating safely and efficiently.