Ultrasonic Phased Array technology can be used for weld inspection in lieu of radiography on piping, pipelines, pressure vessels, and tanks per code approvals. We also provide Phased Array for corrosion scanning of piping, pressure vessels and tanks.
Unlike traditional UT methods Phased Array uses many different beams in one transducer, instead of the one beam in traditional ultrasonics. These multiple phased array beams is more sensitive and faster. As seen in the figure below.
The colors represent the amplitude from the returned signals. Red being the deepest area of corrosion.
Along with this C-scan presentation an A-scan presentation with a digital number representing the depth of corrosion is also given to the operator of the Phased Array unit. This is included into the report.
Typical A, B and C – scan images for corrosion scanning evaluation.
A-scan image is a time versus amplitude display. Time it takes for the ultrasound wave to travel to the indication and back, amplitude is amount of received sound back from indication.
B-scan is a cross sectional view of indication. If you can picture cutting a pipe in half and looking at the pipe wall, this is the cross section.
C-scan image is plan view of indication (looking down similar to x-ray film).
The benefits of using Phased Array in lieu of Radiography are many, some of which are Phased Array is less expensive, faster and no area to be cleared. Production personnel can continue to work as Phased Array is being done.
Results are immediate as the technician scans, no film developing required or storage of film. All results can be given on CD, printed report or emailed. Phased Array can be done manually, semi automated or a completely automated system.
Reporting is an important aspect to Phased Array Ultrasonic’s. The report is easily printed from the PA unit or can be exported for further processing into other programs. The report, can be easily formatted to be read by untrained personnel.
The report generated offers more detail than RT film and is more easily interpreted. Below is a typical screen shot of a single bevel weld, using weld overlay software we use in our inspections. The software can be set up for any weld configuration, including bevel angle, thickness and root opening.
QCNDT’s phased array instrument is code compliant for the inspection of ASME Section VIII pressure vessels, B31.3, B31.1 piping and API 1104. AWS codes.
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