Pressure vessels data/specification

No incidents of decarburization or fissuring of pressure vessels built to the specifications of Section VHI, Division 2, of the ASME Code have been reported. None of the failure data in Figure 1 represent materials used at the higher allowable stresses. 

Data collected during probing is plotted as a function of distance through the pressure vessel. Figure 14.6 shows what some specific problems would look like when graphed. 

The Data Sheet gives specifications for the design of a pressure vessel to be used as a reabsorber in a process plant. The design for this tower will be worked out by inserting known values from the calculation sheet and by solving pertinent equations shown on computation forms A through L. 

High-pressure operations should be carried out only with equipment specifically built for this use and only by those trained especially to use this equipment. Reactions should neva- be carried out in, nor heat applied to, an apparatus that is a closed system unless it has been designed and tested to withstand pressure. To ensure that the equipment has been properly designed, each pressure vessel should have stamped on it, or on an attached plate, its maximum allowable working pressure, the allowable temperature at this pressure, and the material of construction. Similarly, the relief pressure and setting data should be stamped on a metal tag attached to installed pressure-relief devices, and the setting mechanisms should be sealed. Relief devices used on pressure regulators do not require these seals or numbers. 

In this chapter, after giving an overview of the embrittlement of Western pressurized water reactor (PWR) reactor pressure vessel (RPV) beltline materials, together with the characteristics of PWR RPVs, such as their general specification, core region materials and the effects of variables on embrittlement, the surveillance database obtained from US, French and Japanese nuclear power plants (NPPs) and those from other countries is presented based on open literature. The surveillance program of each country is also briefiy described. Trends of surveillance data which will be obtained in the near future are described. The possibility of new data from reconstituted and miniature specimen techniques is described. 

The total height of the RPV is 10.7m. Specific design characteristics for the QP300 reactor pressure vessel are given in the General Design Data (in Section 6.4). 

Similarly, Baers and Harsanen (1993) have determined the specific Nb activities in reactor pressure vessel steel (containing niobium in the ppm range) and plating ( 1% Mb). Niobium was isolated from the other radionuclides by ion exchange chromatography and ""Nb measured by liquid scintillation spectrometry niobium mass in the samples was determined by inductively-coupled plasma mass spectrometry. In this way, it was possible to rule out interferences caused by other radionuclides. However, the data to be used for the calculation of fast neutron fluence can be impaired by ""Nb which is formed by decay of Mo which is an (n,y) product of stable Mo. This interference becomes significant when the... 

The ASME Code, VIII-2, requires a formal design report with the assumptions in the User s Design Specification incorporated in the stress analysis calculations. These calculations are prepared and certified by a registered professional engineer experienced in pressure vessel design. As with the User s Design Specification, the Manufacturer s Design Report is mandatory and the certification reported on the Manufacturer s Data Report. This is kept on file by the manufacturer for live years. 

A model of a reaction process is a set of data and equations that is believed to represent the performance of a specific vessel configuration (mixed, plug flow, laminar, dispersed, and so on). The equations include the stoichiometric relations, rate equations, heat and material balances, and auxihaiy relations such as those of mass transfer, pressure variation, contac ting efficiency, residence time distribution, and so on. The data describe physical and thermodynamic properties and, in the ultimate analysis, economic factors. 

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