Parametric programs for 3D modeling in the function of NDT and determining life of pressure vessels

Abstract

Preparation for non-destructive testing (NDT), preparation of test reports, and control calculation of a pressure vessel using the finite element method (FEM), with or without identified irregularities, requires the use of commercial parametric modeling programs. 3D modeling programs enable the determination of the most critical part of the pressure vessel construction as well as the modeling of irregularities after the tests that occurred during the construction, calculation, and exploitation of the pressure vessel construction itself. Irregularities are reflected in the form of improperly performed welded joints, cracks, corrosion, erosion or cavitation of materials, and are used for the preparation of test reports and control calculations of the pressure vessels construction with and/or without identified irregularities and defects, with the aim of making the correct decision on continued exploitation of the pressure vessel construction or its degree of repair. The possibility of an unlimited number of views, as well as the possibility of an unlimited number of sections of the entire pressure vessel structure or its part, releases us from creating complicated 2D sketches for the purpose of NDT or control calculation of the pressure vessel FEM structure. In connection with other computer programs or for the calculation of FEM (fracture mechanics, fatigue), pressure vessel models made in 3D, enable the preparation of a quality test report with the defined traceability and repeatability required by the SRPS ISO/IEC 17025 standard, as well as the making of the correct decision on the exploitation and service life of the structure pressure vessel.