Nondestructive testing of wooden vessels

K. A. Hansen
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Abstract

The Coast Guard is responsible for the safety of over 2000 wooden boats which are used as passenger vessels throughout the U.S. There is limited direction given to the Coast Guard inspectors within the Code of Federal Regulations and other documents so they must rely on their experience to assess the safety of the vessels. On December 5, 1993, the small passenger vessel El Toro II sank in the Chesapeake Bay with the loss of three people. As a result of the casualties, the National Transportation Safety Board made several recommendations to the Coast Guard and small passenger industry. One of these was that nondestructive inspection techniques for inspecting fasteners on wooden vessels should be investigated. This paper reports the results of a project at the Coast Guard R&D Center which has tested and identified some methods which may be utilized to improve the inspection of wooden vessels. In this project, previous work performed for inspection of wooden structures was reviewed and those which held the most promise were evaluated on a donated vessel. The test hull was then taken apart and the actual conditions compared to the test results. It appears that conventional and real-time X-rays can help inspectors determine the condition of vessels without causing damage. With some further development, two other techniques, SMARTHAMMER and CAPICIFLECTOR, have the potential of helping inspectors identify questionable areas.
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木容器的无损检测
海岸警卫队负责2000多艘木船的安全,这些木船在美国各地被用作客船。根据联邦法规和其他文件,海岸警卫队检查员的指示有限,因此他们必须依靠他们的经验来评估船只的安全。1993年12月5日,小型客轮El Toro II在切萨皮克湾沉没,造成三人死亡。由于人员伤亡,国家运输安全委员会向海岸警卫队和小型客运行业提出了几项建议。其中之一是对木质容器紧固件的无损检测技术进行研究。本文报告了海岸警卫队研发中心的一个项目的结果,该项目测试并确定了一些可用于改进木制船舶检验的方法。在这个项目中,我们回顾了之前对木结构进行检查的工作,并在一艘捐赠的船上对那些最有希望的木结构进行了评估。然后将测试船体拆开,并将实际情况与测试结果进行比较。传统和实时x射线似乎可以帮助检查人员在不造成损害的情况下确定血管的状况。随着进一步的发展,另外两种技术,SMARTHAMMER和CAPICIFLECTOR,有可能帮助检查人员识别有问题的区域。
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