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Last Updated: 2021.6

Pressures

Override: When this box is checked, the Pressure field can be changed to a pressure other than that of the host. If the box is cleared, the Pressure field is locked to the host pressure.

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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.

Opening Information

Nozzle Path: If the opening is in a Category A joint, select Cat. A. If the nozzle is in ERW or autogenously welded pipe and it is not clear where the welds are or it is clear that the opening is in one of the joints, select ERW/Auto. For all other cases, select None. This setting affects the value of E1 used to determine the value of A1 in the reinforcement calculations; see the definition of E1 in UG-37 for more information.

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Nozzle or reinf. Outside 80% of Center: For nozzles in elliptical heads, select the box when any of the reinforcement of the nozzle neck crosses outside the 80% region, which is defined as a circle centered on the head axis that includes 80% of the head skirt inside diameter. If the nozzle and its reinforcement (including any reinforcement from the head) are completely within the 80% region, the box may be left clear. This will affect the value of tr used to determine the values of A and A1 in the reinforcement calculations. See the definition of tr in UG-37 for more information.

Nozzle Material

Material: A brief description of the component material. When the material selection dialog is used, the default description is based on settings on the Materials-Misc. tab under Tools > Defaults. For example, if the settings are for Spec and Type/Grade and the material is SA-516 Grade 70, this field will show SA-516 Gr. 70. If the settings are instead just for Spec, the field will show SA-516. The field may be edited by the user to say anything without breaking the relationship to the material database; while this flexibility can be very helpful, the user must take care to enter correct information.

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Factor B table: The external pressure table assigned to the material in the allowable stress tables in Section II, Part D. The table is used to determine the external pressure strength of the component and also the longitudinal compressive strength. Selecting a Factor B table other than the one assigned to the material will sever the connection to the material in the database as indicated by the “Unlisted Material” caption.

Nozzle Dimensions

Inside Diameter: The component inside diameter in the new condition.

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UG-45 Comparison: Select the number of digits from the nozzle thickness to compare to the UG-45 thickness requirement. The default value is four decimal places for customary units and two decimal places for metric units. The number of decimal places used is examined after any pipe tolerances have been considered.

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