(Includes Jacket and Heat Exchanger Components)
Use Diameter: This option is only available for some components. The user may choose to input dimensions as the inside dimensions or the outside dimensions where this option is available. For some components (such as shell), the use of outside dimensions for internal pressure calculations may result in a slightly higher required thickness.
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The following fields are not used by this software; they are listed here for the convenience of filling out the data forms in DesignDocs and FormPro.
Radiography: This field represents the degree of radiography performed on the joints. See UW-11 for more information. Joint type: This field represents the joint type for the joints. See Table UW-12 for more information. Is an inner head: Select the check box to indicate the entire head (both the concave and convex sides) is in the interior of the vessel. |
Head/Reducer Dimensions
Diameter: The component diameter in the new condition. The selection in the “Use Diameter” area determines whether this is the inside or outside diameter of the component. In the context of curved heads, this value is specifically the skirt diameter. For circular flat heads, this is the diameter as defined in per the configuration in UG-34.
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Efficiency: The joint efficiency of the component, which is determined from Table UW-12 for welded joints and may also represent ligament efficiency per UG-53. When both ligaments and welded joints exist, the lowest efficiency is used. See Appendix L for further help in determining the efficiency. UG-32 defines E to include the head to shell seam for hemi-spherical heads.
Crown Radius: The component crown radius in the new condition. The selection in the “Use Diameter” area determines whether this is the inside or outside crown radius. This field is only available for heads that have a crown or spherical portion – ASME F & D, Torispherical, Hemispherical, and Dish Cover. If the head type is ASME F & D, the value will be locked to the “Diameter” field to meet the dimension requirements of UG-32. If the head type is Torispherical, the value will default based on the settings under Tools > Defaults.
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Nominal t: This value is in the new condition. For the component to pass, this value must be at least the sum of the thickness necessary for pressure and temperature, corrosion allowances, and forming allowances or under-tolerances. If the thickness necessary for pressure and temperature is less than the thickness required by UG-16, the nominal thickness must be at least the sum of the UG-16 thickness and the tolerances, etc. In some cases, under-tolerance is not considered (e.g., for nozzle reinforcement, the under-tolerance of the nozzle neck is ignored). When “Solve for Thickness” is selected, the software will determine the smallest standard size that passes. The user is able to manually edit this value.
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