Vessel wall thickness

Based on the selected vessel design pressure (P) and temper ure (T), vessel shell wall thickness (dts, in inch) and head wall thickness (dth, in inch) can be calculated as follows  

D is vessel inside diameter, in ft S is allowable metal stress, in psi E isjointefftdency. For carbon steel, allowable metal stress (S) is 20,000 psi for temperature up to 500°F. 

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The vessel wall thickness must be sufficient to ensure the maximum stress intensity does not exceed the design stress (nominal design strength) for the material of construction, at any point. 

Using the results of Problem 12-11, determine the required vessel wall thickness to contain this explosion if the vessel is made of stainless 316. 

Using the results of Problem 12-13, determine the vessel wall thickness required to contain an explosion in another vessel that is physically connected to the first vessel with a 1-in pipe. Describe why the second vessel requires a greater wall thickness. 

Determine the vessel wall thickness required to contain an explosion of 2 lb of TNT. The spherical vessel is 1.5 ft in diameter and is constructed with stainless steel 316. 

Mechanical design of the adsorber then takes up the remainder of the engineering effort to produce a workable adsorption process design. Once a vessel is sized to provide the required inventory of adsorbenf we need to provide the mechanical details, which include flow distribution devices, bed supports and the required vessel wall thickness to withstand the working pressure and added stresses encountered during regeneration and repeated de-pressurization and re-pressurization. 

There are drawbacks to fuel cell pressurization such as the potential for faster cell degradation and the need for a larger pressure vessel wall thickness which leads to increased capital costs. It is quite possible that pressure vessel code requirements... 

Good design practices to ensure that the mechanical design of the equipment is suited to normal operation, startup, shutdown, and emergency conditions (for example, ensuring that vessel wall thickness, design temperature and pressure, corrosion allowance, etc., adhere to industry or national codes and standards) ... 

Youngs modulus of elasticity Dimensionless initial fragment acceleration PeAR/Mde = PeR/mae for vessel completely shattered into many small fragments Acceleration due to gravity Vessel wall thickness... 

Table 6.3 Summary of Equations for Calculating Vessel Wall Thickness...

When adding the vessel-wall thickness the reactor diameter will be greater. At a design pressure of 500 psig (34.5 barg), Fulton and Fair [27] calculate a wall thickness of 4 in (10.2 cm). To keep below the shipping diameter of 13.5 ft (4.11 m), use an inside diameter of diameter of 12.5 ft (3.81 m). 

Allowances for expected corrosion over the plant life or time between replacements must be added to the minimum vessel wall thicknesses calculated to comply with the ASME BPV Code. These corrosion allowances can be economically or mechanically prohibitive if the corrosion rate is high. Guidance on corrosion allowances is given in the ASME BPV Code Sec. VIII Div. 1 Non-mandatory Appendix E. The corrosion allowance should at least equal the expected corrosion loss during the desired life of the vessel. 

How pressure vessels are designed and what determines the vessel wall thickness How the ASME Boiler and Pressure Vessel Code is used in pressure vessel design Why pressure safety valves are used and how to select, design and specify pressure relief systems... 

An elementary understanding of pressure vessel design is needed in the preliminary stages of design, as most correlations for pressure vessel costs are based on the weight of metal required, and hence require an estimate of the vessel wall thickness as well as its volume. In many cases the required wall thickness will be determined by the combination of loads acting on the vessel rather than internal pressure alone. 

During the Monte Carlo sampling process, the sampled values of OTnotcu), fluence, Cu, Ni, P, and Mn are used to compute a sampled value of ATso using the relationships in Table 12.1. The flaw depths are deterministic and are defined in increments of 1/100 of the vessel wall thickness, while the number of flaws in a vessel and the flaw aspect ratios are sampled from distributions. The maximum value of cpi obtained from Eq. 12.6 for a specific transient and flaw size is the CPI for that transient and flaw size. 

Calculation of the vessel wall thickness for cylinders (and all other shapes) is done according to an internationally-recognized procedure . ... 

The equation from which a vessel wall thickness of a straight-sided cylindrical vessel (Figures 2.21 and 2.22 for example) is to be calculated, using the ASME code, is Equation 2.3. ... 

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