Automated Ultrasonic inspection uses several types of UT transducers, depending on the examination type and the desired inspection to be performed. These transducers are mounted to a magnetic robotic crawler which has the ability to cover large areas of the vessel or piping surface. The data is collected and displayed in real-time color using multiple views such as A-Scan, B-Scan, C-Scan, and D-Scan images. A-scan representation is a time trace view in which signals are represented an amplitude in screen height. The B-scan and D-scan presentations are two-dimensional views of cross-sectional planes through the test object on different axis. These images are helpful in distinguishing mid-wall inclusions such as laminations and hydrogen damage in the form of blistering and step-wise cracking, from back-wall discontinuities like corrosion/erosion and internal attachments. The C-scan image is a plot plan view of the object. C-Scan is the most recognized view in AUT as it represents a topographical image of the test piece.
Corrosion mapping is the most basic form of AUT inspection. Information provided by corrosion mapping allows engineers and inspection personnel to look at the test piece and it's structure to determine corrosion rates, maintenance scheduling, and overall fitness-for-service. AUT also is used to evaluate equipment for hydrogen damage in the form of HIC/SOHIC (hydrogen induced cracking/stress oriented hydrogen induced cracking). Laminar discontinuities and blistering are a major concern for services where hydrogen is present as they lead to step-wise cracking and catastrophic failure. It is possible to scan up to 500 square feet of surface area per day with the automated system. Material degradation is found in all areas of petrochemical and refining systems. A proper AUT inspection program helps locate and monitor these trouble areas to help ensure the safety of the facility, it's personnel, and the surrounding communities.
Below is an actual Corrosion Map taken from an In-Service Pipeline and video of the system working on a 160 deg. F. tower.
Automated Ultrasonic Testing
The Bighorn AUT inspection system uses cutting edge technology to provide complete automated inspection capabilities. The system has the capabilities to apply basic Pulse Echo Corrosion Mapping, TOFD techniques, and Phased Array technology to ultrasonically screen pressure vessels and piping systems found in the refining and petrochemical industries. A true representation of the tested material is presented to the inspector for complete evaluation of the piece. The data is digitally recorded and stored. Scans are marked on the test piece for repeatability for long-term monitoring purposes.Type your paragraph here.