Axial Load: 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.
For Internal Pressure
Internal Pressure: The internal design pressure (pressure on the concave side). This value is gauge pressure. When “Solve for Thickness” is selected, this value is an input and should not include static head. When “Solve for Pressure” is selected, this value is a result. In the latter case, it represents the total internal pressure (design pressure plus head) that the component can handle and meet code in the absence of any other loadings.
Static Head: The internal pressure (pressure on the concave side) resulting from the static head of the fluid. The user must determine this value and input it accordingly. It will be added to the Pressure input and the sum will be used in the internal pressure calculations for the component. This field will not be present when “Solve for Pressure” is selected.
For External Pressure
External Pressure: The external design pressure (pressure on the convex side). This value is gauge pressure. If the user wishes to consider the effect of static head for the external pressure case, this input must be altered to consider the effect.
Juncture is a line of support: Select this box to consider 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 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 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 box to avoid performing this comparison. See UG-33(f) for more information.
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