Naslov
Defining the safety of pressure equipment in energy applications using XFEM

Autori
Galić, Ivica

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, ostalo, znanstveni

Skup
Splitech 2023

Mjesto i datum
Bol, Hrvatska, 21.06.2023. - 23.06.2023

Vrsta sudjelovanja
Plenarno

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Safety, pressure equipment, XFEM, valve body, PED, Paris low

Sažetak
Valves are the primary elements used to control the flow of media in power plants. Therefore, they greatly affect the very reliability of the operation of such plants. They are often loaded by high internal pressure and high temperature of the medium flowing through them. To define are the valves safe for people in their environment, they fall under strict pressure equipment directives 2014/68/EU. According to those directives it is necessary to defining a category in which is considered valve. Defining the category an engineer can determine the scope of the technical calculations and the necessary certificates that need to be obtained before putting the valve into operation. Here lies one big problem because directives support only vessels and pipes. Therefore, this paper describes in detail the categorization of valve with respect to those directives and procedure of valve body wall thickness calculation during the design phase. As mentioned, the reliability of power plants is largely related to the reliability of valve operation, and therefore it is necessary to define their maintenance interval. In order to obtain this interval, it is necessary to determine the maximum failure that the valve body can contain and still safely operate until the next maintenance. Common method is defining number of cycles necessary for the crack reaching its critical dimension. One way to accomplish this is using the Finite Element Method (FEM) and the classical singular element formulation to determine the fracture mechanics parameters and then with help of Parris low to define the crack growth. Knowing this rate, it is possible to define the service interval. This method is very time-consuming, so this article describes in detail the relatively new eXtended Finite Element Method (XFEM), its application, as well as the possible dangers of using XFEM. At the end of article, it is shown an example of defining crack growth in the wall of the valve body.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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