Temperature: The maximum mean metal design temperature for the base ring.

Base Plate Thickness: The thickness of the base plate.

Base Plate O.D.: The outside diameter of the base plate in the new condition.

Base Plate I.D.: The inside diameter of the base plate in the new condition.

Skirt O.D. at Bottom: The outside diameter of the skirt where it intersects the bottom of the base ring. This value will fill in based on the skirt design.

Base Plate Width: The width of the base ring. This is calculated from the base ring OD and ID.

Width, Outside of Skirt: The width of the base ring outside of the skirt OD. This is calculated from the base ring OD and the skirt OD (at the bottom).

Base Ring 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.

Condition: A brief description of the component material. Similar to the "Material" field, the description will default a certain way based on settings on the Materials-Misc. tab under Tools > Defaults when the material selection is used. This field may be edited by the user without breaking the relationship to the material database. As with the “Material” field, the user must take care to enter correct information.

Density: The material density based on table PRD from Section II, Part D. For those materials that did not have a clear match in this table, every effort was made to assign conservative values. Manually editing this field will sever the connection to the material in the database as indicated by the "Unlisted Material" caption.

Yield Strength: The material yield strength at the base ring temperature. This value comes from Section II, Part D, Table Y-1. In cases where the base ring temperature exceeds the highest temperature entry for this material’s yield line, the value will be zero. There are several materials that do not have clear matches in these tables. When a clear match cannot be found by the software’s assignment criteria, the software will calculate the yield strength using the external pressure chart and the method described in UG-28(c)(2) Step 3. This is more common with non-ferrous materials. If no match is found and the software cannot perform the described calculation, this value will be zero. Manually editing this field will inform the software that the user is defining the material differently than what is stored in the database and the connection to the material in the database will be severed. This is indicated by the “Unlisted Material” caption.

Related articles

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Attaching Structural Elements
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Base Ring - Anchor Bolt
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Base Ring and Skirt Supports for Vertical Vessels
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Designing a Base Ring without a Skirt
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Component Order Troubleshooting

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