Stress Analysis On New Pressure Vessel With Thin Inner Shell Cross-Helical Wound Shaped Steel

Pressure vessels are typical combinational structures of steel plates and welding shells, which have great applications in various areas of industries. Pressure vessels in which their design pressures are between 10MPa-100MPa are known as high pressure vessels. Since their total thick walls are usually about 50mm-400mm, high-pressure thick-walled vessels are often referred to as. Generally, in design and manufacture of high pressure vessels, there are much stricter requirements than normal pressure vessels. They are widely used in many areas of industries such as in chemical, oil refining, light industry, metallurgy, energy, power plants, coal chemical industry, heavy machinery, aerospace engineering, oil exploration, and marine engineering department, for example ammonia synthesis tower, urea synthesis tower, oil hydrogenation reactor, reactor pressure vessel, coal liquefaction reactor, hydraulic press and a liquid hydrogen storage container, high-pressure liquid oxygen etc. Most of them are key equipments in their productions and in scientific researches. Features of them are wide in applications, large in structures, difficult in manufactures, expensive cost, and potentially explosive, burning and poisoning in use. Therefore, in full under the premise of safety assurance, to maximize its economic is become the key of the high-pressure vessel technology.This dissertation describes a new type structure based on general analysis of existing structure characteristics and technique manufacture, that is, new pressure vessel with thin inner shell cross-helical wound shaped steel. The difference between the new type structure and traditional strip-wound techniques (German strip-wound technique and flat steel ribbon wound technique) is that, new two-groove shaped steel is enwound on thin inner cross-helical with small angle. Thickness of thin inner is about 25% of total wall thickness. It is smooth among strip layers. Strip layers can bear axial load by mating, which can reinforce the vessel both in its axial direction and circumferential direction greatly, and its manufacture will be more convenient than others.Stress analysis and its calculation formula for the cylinder of new strip-wound structure were performed and deduced, and then strip layers were analyzed and compared by professional FEM software of ANSYS. Further more, some strip winding techniques, strip layers head-tail handling and some manufacture techniques of new strip-wound vessel would be discussed preliminary in this paper.Comparing with other type structures of vessels, it showes that new strip-wound vessel not only has effective loading, reliabe safety and cost economic but also can be fit for winding various sizes of pressure vessels. The objective of analysis is to establish a basic theory to develop a new type of pressure vessel and its manufacture technology. It should become safer and more ecconomic than traditional types. A certain reference value and engineering significance will be provided in this dissertation.