How We Measure Up — Our Latest Results From Testing On API 653 Test Plates

Veritank has released the results of the inspection of a calibrated test plate using the two NDT technologies currently available on our in-service inspection robot— Pulsed Eddy Current (PEC) and Phased Array Ultrasonic Testing (PAUT). The test was run on a plate with known manufactured defects that meet the standards of API-653, Annex G.5.1, Qualification Test Plates, in conditions that simulate the robot’s normal operating environment.

Validation testing was held at the Veritank headquarters in Houston, TX. Veritank has installed a high accuracy x,y,z submerged test table. The test tank can support plate sections up to 7’ x 20’, allowing for the scanning of actual tank floor sections. We are able to simulate various forms of sedimentation and other anomalies that might be encountered while performing in-service scanning with our robot. This test facility is available for client use - Contact Us for more details.

Test results show an overall ability of both PEC and PAUT sensor types to detect thickness loss on a low-carbon steel plate. 

Test results prove that PEC is a valuable screening tool, allowing for areas to be identified for UT prove up. Of considerable benefit is PEC’s ability to scan through higher levels of sedimentation, sedimentation that would inhibit good UT data.

During testing we demonstrated that our PAUT technology can accurately measure and characterize the thickness of a low-carbon steel tank floor — exceeding API 653 qualification standards. Throughout the course of our testing, all defect sizing results were within the permissible ±.020 inches.

We are continually examining and improving our sensors performance using actual plates from condemned storage tanks with known natural corrosion.

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