Method for inspecting an internal floating roof in a liquid-containing storage tank
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United States of America Patent
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Apr 19, 2005
Grant Date -
Feb 26, 2004
app pub date -
Aug 20, 2002
filing date -
Aug 20, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Methods for remotely inspecting an internal floating roof and the seals associated with such internal floating roof project an illumination pattern from a series of substantially parallel laser beams onto the floating roof and/or the seal. Another laser beam projects at a predetermined angle offset from the series of laser beams. The illumination pattern and offset spot from the other laser are viewed through a camera. The length of a defect in the internal floating roof or seal or a gap between the seal and the tank wall is calculated as the length of a side of a right triangle based upon the predetermined angle and the predetermined distance between the lasers and the floating roof or seal.
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