Application of Sintap to the Failure Assessment of Gas Pipes

The fracture behavior of structures depends on loading conditions, geometry of component and material properties. Therefore, in those cases when loading conditions and geometry of component are known, the material should ensure the integrity of the structure and ductile fracture behavior of component. Therefore, it is necessary to select right material for structure regarding to flaw's size and position and as well loading condition. It is especially important for safety, reliability, and integrity of pipes, where materials are exposed to different environmental influences and material-ageing processes. Fracture mechanicsbased flaw assessment concepts are increasingly used in industrial regulations and standards for ensuring structure integrity. A considerable number of different guidelines and procedures are available which are partly based on the same bases but also exhibit significant differences. The European Union sponsored Structural Integrity Assessment Procedure (SINTAP), an interdisciplinary Brite—Euram project. SINTAP is useful engineering tool, in order to find appropriate material or maximum loading capacity of structural component with crack. Parts of the structure are also deformed during manufacturing and installation. The aim of this chapter is demonstrate the use of SINTAP in order to find maximum internal pressure capacity of gas pipe, regarding to two materials degradation. The results of analysis show that decrease in mechanical properties and fracture.