CORROSION DIAGNOSTIC SYSTEM

To provide a corrosion diagnostic system allowing for prediction of the outer surface corrosion position and remaining life of coated equipment and piping in a plant.SOLUTION: A corrosion diagnostic system 100 diagnosing the corrosion of a metal material side at an interface between the metal material and a non-metal material, comprises a processing device 10, and a storage device 20 holding meteorological information, construction information, design information and operation information. The processing device 10 includes: a first calculation unit 11 calculating the probability of water presence on metal surface for each position from the information of the storage device 20, calculating corrosion occurrence probability on the basis of this water presence probability, and determining that the position where the corrosion occurrence probability is greater than or equal to a prescribed threshold is a corroded position; a second calculation unit 12 calculating a corrosion rate for the corroded position on the basis of a corrosion rate prediction formula and the information of the storage device 20, calculating the amount of reduction in thickness from the corrosion rate, and determining a remaining life; and a display processing unit 13 outputting, to a display device 32, maintenance inspection unnecessary information for positions other than the corroded position determined by the first calculation unit 11 and the content of maintenance inspection for the corroded position from the remaining life determined by the second calculation unit 12.SELECTED DRAWING: Figure 1 【課題】プラントにおける被覆材施工の機器・配管の外表面腐食位置及び余寿命を予測することができる腐食診断システムを提供する。【解決手段】金属材料と非金属材料との界面での金属材料側の腐食を診断する腐食診断システム１００は、処理装置１０と、気象情報、施工情報、設計情報、運転情報を保持する記憶装置２０とを備え、処理装置１０は、記憶装置２０の情報より、位置ごとに金属表面の水存在確率を算出し、その水存在確率に基づき腐食発生確率を演算し、所定の閾値以上の腐食発生確率の位置を腐食位置と判定する第１演算部１１と、腐食位置について、腐食速度予測式と記憶装置２０の情報を基に腐食速度を算出し、腐食速度から減肉量を演算して、余寿命を判定する第２演算部１２と、第１演算部１１で腐食位置以外の位置は保守点検不要情報を、腐食位置は第２演算部１２の余寿命結果より保守点検内容を、表示装置３２に出力する表示処理部１３とを含む。【選択図】図１