Knowledge base system (KBS) applied on corrosion damage assessment on metallic structure pipes

Abstract

This paper aims to outline a proposed knowledge base system (KBS) for the assessment of corrosive damage on metallic pipe conduits. KBS is developed by using two information sources available for assessing the corrosive damage of pipes which are mainly: expert knowledge and field data. In our knowledge, it's a new method that assists the engineer in his task for assessing the degree of damage on metallic pipes, yielding therefore to a rational evaluation of the corrosive damage (hence the ECOR system) on metallic structures of pipeline, and permits to assign the damage degree on the structure qualitatively while using a ladder of indications representing the severity of each damage type (pitting, crater, weight loss and crack), regarding the priority of either repairing or replacing the metal piece. Furthermore, the analytic hierarchy process is implemented overall the system to determine whether the damage severity requires the engineer intervention in a systematic and rational way.

Performance assurance of mechanical engineering construction in the existence of cracks

“…In addition, residual welding stresses that are tensile inside the heat-affected zone, as well as imperfections of the seam shape and possible embrittlement of the material can lead to an increase in the probability of cracking [3]. Therefore, it is advisable to give preference to methods that reduce the concentration in the danger zone.…”

“…Determination of K coefficients for various concentrators represented by drilled cracks is performed either by well-known dependencies, or by the results of solving the corresponding problems with the methods of the two-dimensional elasticity theory, or experimentally [1,3,[23][24][25][26][27][28][29].…”

“…The use of fracture mechanics to assess the performance of machine-building structures made it possible to proceed to the normalization of various parameters characterizing the crack resistance of the material [1][2][3][4][5][6][7][8][9]. This made it possible to choose material in terms of preventing crack formation.…”

“…Hence an individual approach to assessing and ensuring the performance of nodes and parts with cracks remains relevant. It takes into account the features of operation in machine drives [2][3][4].…”

“…The purpose of [3] is to describe the methodology for assessing the crack resistance of metal pipes due to corrosion damage. A gradation scale was developed representing the magnitudes of each defect type (dimples, pits, weight loss, and cracks).…”