Analysis and Design of Hemispherical Head Pressure Vessel

Year 2019, Volume: 2 Issue: 1, 35 - 45, 16.06.2019

Hasan Huseyin Ozkan Safa Ozhan Garip Genc

Abstract

In this study, a hemispherical head with pad reinforced central nozzle opening that subjected to uniform internal pressure was investigated using Finite Element Methods (FEM) to understand the design procedure. This procedure is handled according to the ASME Boiler and Pressure Vessel Code Section VIII Division 2. This standard contains two parts for the design of pressure vessels, the first part is Design by rules and the second part is Design by analysis. With reference to the ASME standard, axisymmetric finite element models for Elastic, Limit Load and Elastic-Plastic Analysis are used to demonstrate protection against plastic collapse and local failure. Maximum allowable pressures are obtained in accordance with the mentioned design methods and discussed. According to the elastic and limit load analysis methods, obtained plastic collapse results are very close. Besides, the elastic analysis method is observed to be more conservative than the Elastic-Plastic method regarding the evaluation of plastic collapse. On the other hand, for the local failure results, Elastic-Plastic Analysis is observed to be slightly conservative than the Elastic Analysis. 

Keywords

Internally Pressurized Pressure Vessels, Finite Element Method, Design by Rules, Design by Analysis

Küresel Bombeli Basınçlı Kap Analiz ve Tasarımı

Abstract

Bu çalışmada küresel bombe merkezinde ve kaynaklı plaka ile takviyelenmiş bir nozul açıklığı iç basınç yüklemesi altında sonlu elemanlar yöntemiyle tasarım prosedürünü anlamak amacıyla incelenmiştir.

Bu prosedür ASME Boiler and Pressure Vessel Code Section VIII Division 2 standardına göre ele alınmıştır. Bu standart ilki “Formüller ile Tasarım” ve ikincisi “Analiz ile Tasarım” olmak üzere basınçlı kap tasarımı için iki farklı kısım içerir. ASME standardı referans alınarak, “Plastik Çökme” ve “Lokal Hasar” hasar modlarına karşı dayanımı doğrulamak için aksisimetrik sonlu eleman modelleri ile elastik, limit yük ve elastik-plastik analiz yöntemleri kullanılmıştır. Maksimum izin verilen basınçlar bu analiz yöntemlerine göre elde edilmiş ve değerlendirilmiştir. Elastik ve limit yük analiz metodlarına göre elde edilen plastik çökme sonuçları birbirine çok yakındır. Bunun yanında plastik çökme hasar modu için elastik analiz yönteminin elastik-plastik analiz yöntemine göre daha konservatif sonuçlar verdiği

gözlemlenmiştir. Diğer yandan, lokal hasar modu için elastik-plastik analiz yönteminin elastik analize göre nispeten konservatif olduğu gözlemlenmiştir. 

Keywords

İç Basınca Maruz Basınçlı Kaplar, Sonlu Elemanlar Yöntemi, Formüller ile Tasarım, Analiz ile Tasarım

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