Aimed at producing hardware for ship hull inspections, this project focused in stereophotography, ultrasonic thickness gaging and flaw detection, and magnetic particle inspections. In each case, hardware was chosen on the basis of an extensive survey of users and manufacturers both in America and Europe. Modification and adaptation of off-the-shelf equipment was performed at NCSC in order to arrive at systems easily used by U.S. Navy divers, and tests were run to determine the performance of each system under laboratory and field conditions. The stereophotography system described is an inexpensive unit which produced photographs of excellent quality in spite of zero visibility conditions. Corrosion pit dephts or fouling heights can be measured to approximately + or - 1/64 inch, and incipient paint bilstering can be detected before the blisters pop. The ultrasonic equipment described provides audible feedback to the diver to assist him positioning the transducer. Also, thickness readings and flaw signal amplitude can be stored on computer tape. The magnetic particle inspection systems include permanent record techniques such as magnetic rubber and transferring magnetic particles to a variety of putty-like materials. (DePo)
Underwater nondestructive testing equipment and techniques
Ausruestung und Verfahren fuer eine zerstoerungsfreie Werkstoffpruefung unter Wasser
1979
22 Seiten
Report
English
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