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GUIDED WAVE
INSPECTION
The
inspection of large structures using conventional ultrasonic bulk wave
techniques is slow because scanning is required if the whole structure is to be
tested. Ultrasonic guided waves provide an attractive solution to this problem
because they can be excited at one location on the structure and will propagate
many metres.
However, guided wave testing is
complicated by the presence of many possible wave modes, most of which are
dispersive. These guided wave characteristics offer a wealth of opportunities
for the extraction of information about the structure, but it is crucial to
manage this complexity if the test is to be useable in industrial practice.
Guided wave ultrasonics are
utilized for the rapid scanning of large volume of piping systems. Guided wave
utilizes a ring of transducers that is place around the pipe and emits sound
waves that are sent along the pipe in both directions from the ring. Many feet
of pipe may be inspected at one time, depending on a variety of factors
including surface condition, the presence of pipe wrap systems and mechanical
features such as elbows etc... Guided waves are best used as a screening tool
as part of a more comprehensive strategy that pinpoints where more extensive
volumetric examinations should be performed.
GUL Wavemaker®G4™
The Wavemaker®G4™ is GUL’s newest platform for collecting guided wave inspection data. Released in 2011, it builds upon the proven success of the Wavemaker G3. It contains 32 transducer channels for interfacing to all of GUL’s transduction systems. It also contains a range of peripherals to ensure quality guided wave data is collected quickly and efficiently; these include automatic transducer detection and diagnostics, an operator identification method, and a built in GPS.
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KEY ADVANTAGES • The Wavemaker®G4™ pipescreening system allows long lengths
of pipes in difficult access areas to be quickly screened for corrosion and
other defects. • not needed disconnection of the equipment at the time of
diagnostics; • minimized costs of preparing for the testing; • time savings and high reliability of the identification of
potentially dangerous areas of the pipeline; • time saving on carrying out the technical diagnostics; • The Wavemaker®G4™ system employs lightweight transducer
rings to send guided waves along the pipe • Sophisticated software routines help categorize
reflections from changes in the cross section of the pipe |
