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    Item type:Publication, Access status: without files ,
    Systematic study of the effect of non-uniform seal stiffness on the contact stress in flat-faced soft-seated spring operated pressure relief valves
    (American Society of Mechanical Engineers (ASME), 2018)
    Schimanowski, Alex
    ;
    Seibel, Arthur
    ;
    Schlattmann, Josef
    Spring operated pressure relief valves (SOPRVs) are essential components of technical systems. As parts of safety systems, they protect people and the environment from technological hazards. Their ability to open at a predefined pressure is considered the most important feature. The reliability of this function depends on numerous operational and design factors. In this paper, we examine the effects of design measures on the mechanical loads in seat seals of SOPRVs. In particular, we evaluate the applicability of the principle of non-uniform system stiffness in order to systematically control the mechanical loads in seat seals for an exemplary case of a flat faced soft seated SOPRV. We systematically vary design parameters and accurately estimate the contact stresses as well as the set pressure by performing non-linear finite element analyses. We focus on the quasi-static case of a closed seal, since dynamic effects of the opening and closing processes are not within the scope of this work. In our contribution, we show that the application of these design measures can significantly influence both the initial contact stresses and the set pressure at a constant spring force. In particular, the effects of the taper angle are analyzed and discussed.
    Publicationtype: Conference Paper
      131
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    Item type:Publication, Access status: without files ,
    Methodological support for the selection of simplified equations of state for modeling technical fluids
    (American Society of Mechanical Engineers (ASME), 2017)
    Schimanowski, Alex
    ;
    Seibel, Arthur
    ;
    Schlattmann, Josef
    Many technical applications require accurate predictions of the thermodynamical state of the process fluid, which can be estimated from mathematical equations of state (EoS). Though the existing EoS are sufficiently accurate in the wide operating ranges for various technical fluids, they differ in terms of the complexity, and thus in computation costs. Therefore, for modeling and simulation of large technical systems, preferably simple and sufficiently accurate EoS are desired. The proposed approach presents a methodological support for the selection of appropriate EoS not only considering its accuracy but also its complexity. Furthermode, a cryogenic application involving nitrogen is used to demonstrate the proposed approach.
    Publicationtype: Conference Paper
      97