Mitsubishi Heavy Industries Limited

Keiji Ida

Hideaki Murata

Masaaki Fujita

Hirotoshi Matsumoto

Naoki Suganuma

Kai Zhang

Masakazu Miyachi

Tetsuya Yamada

Satoshi Tasaki

An inspection device and an inspection method for boiler furnace water wall tubes. The inspection device includes a scanner including columns placed upright and fixed by magnets onto the surfaces of multiple water wall tubes extending in the up-down direction on the inner wall surfaces of the boiler furnace, a support frame fixed to the columns to support a displacement sensor producing laser light to be irradiated onto the surface of a water wall tube, and a moving mechanism for moving the displacement sensor in the axial direction of the water wall tube relative to the support frame. A signal processing unit calculates the amount of reduced wall thickness of the water wall tube from a difference between the cross-sectional surface shape of the water wall tube based on a signal from the displacement sensor and a reference shape without reduction in wall thickness.

Inspection device and inspection method for boiler furnace water wall tubes

A position determining method and a work result management device. A position where work is done inside a space surrounded by surfaces is determined, wherein the position where work is done inside the space is a sidewall, wave receivers that receive an acoustic wave signal are placed at three or more points, which are on the same plane substantially parallel to the sidewall but not collinear with one another and whose position coordinates are known. The signal is transmitted from a wave transmitter that transmits an acoustic wave and is placed at the position on the sidewall where work is done, and the respective arrival times of the signal at the three or more wave receivers that are not collinear with one another are measured to determine the position coordinates of the wave transmitter using the arrival times and the position coordinates of the three or more wave receivers.

Method of determining position where work is done in space surrounded by surfaces and work result management device

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Nagasaki, Japan

Keiji Ida