Last Updated: Associated Release: DesignCalcs - 2022.7.0.6065
For Internal Pressure
Internal Pressure: The internal design pressure (pressure on the concave side) . This value is field represents the gauge pressure. When “Solve the Solve for Thickness” Thickness option is selected, this value is an represents the input and should not include the static head. When “Solve the Solve for Pressure” Pressure option is selected, this value is a represents the result. In the latter case, it represents the total internal pressure (design pressure plus the head) that can be sustained by the component can handle and meet remain code compliant in the absence of any other loadings. This The internal pressure value defaults to the value represented on the greater of the cone or cylinder internal pressure. It This aspect can be changedmodified if needed.
Static Head: The internal pressure (pressure on the concave side) resulting field represents the result value from the static head of the fluid. The user must determine this value and input it accordingly . It will be in the system. The value is then added to the Pressure pressure input field, and the sum will be is used in the internal pressure calculations for the component. This field will is not be present when “Solve the Solve for Pressure” Pressure option is selected. This This defaults to the greater of the cone or cylinder static head. It This aspect can be changedmodified if needed.
Axial Load: The axial load field represents the load per unit length on the junction. The check box to the right of the field toggles this value between a tensile load and a compressive load. This value affects the Internal Pressure case only.
For External Pressure
External Pressure: The external pressure field represents the external design pressure (pressure on the convex side). This field is disabled and locked to the value from the cylinder at the junction.
Axial Load: The axial load field represents the load per unit length on the junction. The check box to the right of the field toggles this value between a tensile load and a compressive load. This value affects the External Pressure case only.
Use Custom A: Checking this box will enable the "The Use Custom A check box enables the Custom A" field for input and the when it is selected. The Custom A value will be is used for A in the Line of Support calculations instead of the A value determined by the software.
Custom A: This The Custom A field is only available when the " Use Custom A" check box is checkedselected. This allows the user to determine if an override is needed for the A value that is determined by the software, and instead, use one a value the user has determined from the external pressure charts.
Use Ln Based Interpolation: Checking this box will use The Use Ln Based Interpolation check box uses natural log based interpolation instead of straight line interpolation when determining A from the external pressure charts. Both straight line and natural log based interpolation are considered valid, though it can be argued although it's suggested that natural log based is more accurate for the external pressure charts.
Juncture is a line of support: Select this box to consider The Juncture is a line of support check box considers the junction as a line of support for the design of the vessel for vacuum. With this consideration, the juncture must pass additional requirements. When the juncture is considered a line of support, the code does not require that the cone required thickness (external pressure) be is at least that of the adjacent shell.
Check Cone Pe tr vs. Shell Pe tr: When the junction is not a line of support and this the Check Cone Pe tr vs. Shell Pe tr box is selected, the cone tr for the external pressure case must be at least the shell tr for the external pressure case or the junction analysis will fail. Clear this can fail. Deselect the Check Cone Pe tr vs. Shell Pe tr box to avoid performing this comparison. See UG-33(f) for more information.
...