Papers by Keyword: Pressure Vessel Steel

Abstract: According to the process feature of Pressure Vessel Manufacturing Enterprises,a PDM system for Small-medium Scale Pressure Vessel Manufacturing Enterprises was designed .The system includes many functions such as document management,project management,BOM management,changement management, user’s permissions management.The integration with CAX，ERP，etc．were also considered in the system．The key techniques and conditions in software to realize the functions were explained．The system avoids information isolated between workshops and sections, improves the sharing and Integrality of enterprise’s information．It is useful for management and controlling of Pressure Vessel process and product quality．

Abstract: According to pressure vessel material waste problem in the traditional design, the finite element technique is used to pressure vessel optimization design in this paper. Firstly, the finite element analysis is applied to carry out stress calculation, and we extracted the related results parameters for following calculation. Then we conducted the quantitative calculation after choosing optimization design method, and got the best design parameters which meet performance indexes. At last, we conducted the optimization design of pressure vessels using this technology. Practical results prove the validity and the practicability of this method in the pressure vessels design.

Abstract: The multi-layer pressure vessel generates the preload stress during the process of wrapping & clamping. The contact between the wrapped layers and the inner shell is the source of the preload stress. The contact mechanics model shows the primary mechanics relationship, and the contact pressure vessel causes the local settlement. The theory contact pressure has 5% error with simulation value. The experiment values of inner wall are coincided with the theory stresses, and the largest error between the theory and the experiment is below 16.3%.

Abstract: Filament-wound composites are more and more frequently used for pressure tanks and motor cases. It is essential to study their mechanical properties, especially the properties at peculiar shaped locations. A carbon fiber wound pressure vessel structure was chosen to investigate by experiment and finite element method in our program, respectively. Considering the vessel deformation, internal pressure load was added step by step so that the changing stiffness matrix and changing geometric conditions could be calculated in simulation process. In our experiment, the pressure vessel with strain gauges was tested under internal pressure to get strain data at some typical locations. And a finite element model was built with software ANSYS considering the structural deformation of the pressure vessel. Under internal pressure, it is found that fibers in the cylinder part of the vessel are in tension and fibers in partial dome region are bent and transversely compressed. The simulated results also are in good agreement with experimental results.

Abstract: The paper sums up structural characteristics and design and manufacture status quo of composite pressure vessels and puts forward coherent stress distribution calculation methods and specifies some subjective and objective factors of composite pressure vessel failure and points out that composite pressure vessel analysis is still at an initial stage. The paper has some reference values for composite pressure vessel research.

Abstract: Petrochemical pressure vessel equipment develops to be large-scale and super large-scale under extreme working conditions such as high temperature and high pressure, which puts forward new demands for the reliability of the pressure vessel. The present paper discusses the fatigue design theory of pressure vessels and analyzes the fatigue design methods of ASME, BS5500 and JB4732. Pressure vessel loads absorbed (pressure, temperature, earthquake, wind, snow, etc.) have significant stochastic dynamic characteristics and coupling characteristics. The random load of the current design is simplified, with a large safety factor in exchange for equipment safety. However, it is difficult to guarantee the rationality and accuracy of the result. With the development of data acquisition, processing and finite element technology, it is inevitable to be based on measured load spectrum and consider the coupling of the random loads to work out fatigue reliability design methods of pressure vessels.

Abstract: Electroluminescent, EL, materials are of interest in providing high brightness for display screens found in portable electronic devices, where the battery life is limited. Currently organic luminescent materials are being used, but the lifetime is low due to the degradation of the organic material under electric field over time. Some recent work with inorganic material of zinc sulfide has indicated high brightness at very long life times. This work focuses on the thermal processing of the zinc sulfide based EL material with trinitrotoluene, TNT. The zinc sulfide based phosphor and TNT are placed in a stainless steel container that can withstand high pressure. After closing, the chamber was evacuated and subsequently heated to over 300°C. The ZnS based phosphor was heated to a high temperature as the TNT decomposed. The sample was recovered after cooling and separated by optical observation of photoluminescence with a ultraviolet lamp. X-ray diffraction analysis showed that some transformation to hexagonal wurtzite phase occurred and was retained after cooling. EL and photoluminescence, PL, measurements were performed to characterize the luminescent properties of the material. Results of SEM observations of the particle sizes are discussed. The most recent data shows that blue luminescence at 450nm can be obtained by the treatment of ZnS phosphor with TNT in this high pressure containment device.

Abstract: In this paper, the role of the pearlite-banded structure on fatigue crack growth behavior was investigated on carbon vessel plate material SA516, which is commonly used in the nuclear power plants. Along pearlite-banded orientation, in situ fatigue tests indicate that the crack initiated and propagated in the ferrite and then extended along the ferrite-pearlite interface when it met pearlitic colony. For comparison, the cyclic loading was also carried out perpendicular to the banding direction of the microstructure, and an intense crack branching was observed which led to fatigue crack retardation. Besides, the orientation perpendicular to banded pearlite in the investigated ferrite-pearlite steel was found to have a lower fatigue crack growth rate.

Abstract: 12Cr2Mo1R is a high strength pressure vessel steel used in the petrochemical industry. The mechanical and physical properties of the steel 12Cr2Mo1R which was developed in Wuhan Iron and Steel (Group) Company, were investigated in the present work. Test results showed that the steel 12Cr2Mo1R exhibits a high strength at room temperature and high temperature, high strength along Z-direction, and also has very good impact toughness at lower temperatures. The density, linear expansion coefficient and elasticity modulus were also measured. The measured values are all higher than the corresponding specifications of national standards. The uniform mechanical properties and physical properties is attributed to homogeneous microstructure through steel plates.

Abstract: With the rapid development of modern industry, pressure vessel technology has been widely applied in research and industrial production, and some of pressure vessels have been required under more harsh applied conditions such as severe bearing loads and large-sizes, making higher demands on the manufacturing and security for them. This paper outlines the various pressure cylinder structures that have emerged in history and their evolution processes, and proposes a reasonable interlocking steel strip wound cylinder and analyses its structural characteristics. It can not only resolve the issue of the axial bearing load of the winding cylinder well but also be manufactured economically