Showing papers by "Satoshi Nagai published in 2002"

Method and device for life diagnosis and maintenance management of plant equipment

Abstract: PROBLEM TO BE SOLVED: To obtain a method and device that objectively and quantitatively determines the optimum maintenance management timing, by predicting damage, lowering of performance and timing of function stop in each equipment constituting a plant, and by collecting all of trouble events considerable accompanying them to evaluate the cost on a risk base. SOLUTION: Information inspection, diagnosis, repairing and operation history of equipment constituting the plant is input to an input means 1, troubles estimated in an equipment material are tree-developed by a trouble related developing means 2, and an unreliable degree as to a first item in trouble related development is predicted in a stochastic life evaluation means 4. The unreliable degree between the respective items is calculated by a trouble function calculating means 5 based on a trouble function, the each unreliable degree is multiplied by an expense required for restoring the event to be added together according to the trouble related development, so as to calculate total estimated cost for the trouble restoration, and a preventive maintenance countermeasure expense for preventing the trouble event is comparison-judged with the total estimated cost for the trouble restoration in an operation and maintenance management determining means 8 to determine an operation and maintenance management method. COPYRIGHT: (C)2004,JPO

Maintenance management method for plant equipment and device

Abstract: PROBLEM TO BE SOLVED: To obtain a method and a device for determining objectively and quantitatively optimum maintenance time by cost assessment on a risk basis in extracting failure of equipment composing a plant and failure phenomena conceivably associated therewith or monitoring the minimum items online. SOLUTION: The device is provided with a means 1 for inputting the inspection information and the operation history information, a failure link deployment means 2 for deploying conceivable failures from the inspection phenomena into a tree, a failure function calculation means 4 for calculating degrees of unreliability between respective items in the failure link deployment, a failure recovery estimated cumulative cost calculation means 6 which multiplies respective unreliability degrees by expenses necessary for recovery of the phenomena and adds up the results in accordance with the failure link deployment, a preventive maintenance total cost calculation means 7 for calculating the expense for preventive maintenance measures to prevent the failure phenomena, and a maintenance determination means 8 which compares and determines the entire cost for preventive maintenance and the failure recovery estimated cumulative cost, and determines the maintenance time and the method. COPYRIGHT: (C)2004,JPO

Inspection device for film defect of turbine blade and its method

Abstract: PROBLEM TO BE SOLVED: To provide an inspection device for film defects of a turbine blade easily, accurately detecting the defects of a film covering the blade surface and provide a method therefor. SOLUTION: This inspection device for film defects of the turbine blade is equipped with a film defect inspecting monitoring part 7 placed on a rotating table 6 rotatably supported to a mounting 5, freely movable in front and in rear and aslant on each axis of an X axis, a Y axis, and a Z axis to the turbine blade 1 installed in a turbine shaft 2; a controller 8 controlling the movement in front and in rear and slanting movement of the film defect inspecting monitoring part 7; and an infrared image signal processing part 9 imaging the temperature distribution of the film 3 based on a signal from the film defect inspecting monitoring part 7.

Operation support device for plant equipment

Abstract: PROBLEM TO BE SOLVED: To provide a device for forecasting risks and associated costs regarding damage, performance deterioration and breakdown of equipment comprising plant, and selecting and directing the optimum operation method by comparing gain from the operation with the risks and the associated costs. SOLUTION: An operation support device for this plant equipment is constituted with an event simulation means 6 for calculating, based on a failure statistics database in which an event tree for the plant equipment and degree of unreliability on the failure phenomenon are associated and stored in advance, the degree of unreliability corresponding to parameter for the operation in accordance with the event tree for the plant equipment, a risk and associated cost calculation means 7 for calculating the risks and the associated costs with accumulated amount of the product of the degree of the unreliability and a recovery cost for the failure in accordance with the event tree, an operation method decision means 8 for deciding if conditions for the operation are appropriate from comparison between the risks and the associated costs and the gain to be projected from continuing the operation, and an operation method directive means 9 in which the operation method directs the designated conditions for the operation to the plant equipment in accordance with the operation method decided by a designated means. COPYRIGHT: (C)2004,JPO

Method and equipment for measuring current flow direction and current speed of high-pressure high- temperature fluid

Abstract: PROBLEM TO BE SOLVED: To provide a method and an apparatus for measuring the current direction and current velocity of ground water in high-pressure high-temperature environment or the current velocity distribution of fluid in a high-temperature piping of power plant or chemical plant stably with high accuracy. SOLUTION: Micro solid-state tracers 14, having a specific gravity substantially equal to that of high-pressure high-temperature fluid 3 flowing into a fixed region are fed into the fluid. Time variant fluid position of the tracer is measured continuously or intermittently by an ultrasonic sensor 16 or an optical image pickup means 26 disposed in that region or in the vicinity thereof, and then the current direction and current velocity of the fluid are measured, based on the measurements.