Nozzle - Flange/MDMT

Owned by Former user (Deleted)
Dec 11, 2015
3 min read

Other Calculations

Perform UCS-66 calculations: Selecting this check box will cause the software to perform UCS-66 toughness calculations on the component. This option is only available to materials that are classified as UCS materials per Table UCS-23.

Exemption Drop-down: When UCS-66 calculations will not be performed (the software will not allow these calculations when a non-UCS material is used), an exemption must be entered. The exemption may be typed in or selected from the drop-down options, but the user is responsible for ensuring that the exemption selected is valid for the material, service, etc., in question.

MDMT Reductions

Take UCS-66(b) Reduction: Selecting this check box will take advantage of the reduction in allowed MDMT per UCS-66(b). This paragraph includes a calculation for the component which compensates for any excess material thickness in the component.

Apply UCS-68(c): Selecting this check box will give an additional flat reduction in the allowed MDMT per UCS-68(c). Carefully review this paragraph as there are steep requirements for this exemption.

MDMT

MDMT Curve: The notes in Figure UCS-66 provide the criteria to assign the MDMT curve to the material and product form of the component. Curve A will give the least favorable allowed MDMT and Curve D will give the most favorable allowed MDMT. When UCS materials do not have a clear match using the criteria, they are assigned a conservative value of A. As the software cannot currently obtain possible improvements in curve rating due to heat treatment and other factors, the user may override the curve value.

MDMT Pressure: The net internal pressure (concave side) on the component coincident with the minimum design metal temperature (MDMT). This includes static head.

Flange 1-7(b) Info

The following fields are only available when the Appendix 1-7(b) calculations are required.

Flange OD: The outside diameter of the nozzle flange.

Flange Thickness: The thickness of the nozzle flange, not including the thickness of any raised face.

Flange Bolt Hole Diameter: The diameter of a single bolt hole in the nozzle flange (e.g., 1/2" or 12mm). This is not the bolt circle diameter (e.g., 24" or 610mm).

Shell to flange offset distance: The distance from the outside of the shell wall to the side of the flange nearest the shell. This is measured in the plane that has the shell axis running left/right and the nozzle axis running up/down (assuming the nozzle flange is at the top of the cross-section).

Flange Hot Stress: The material allowable stress at the temperature listed for the internal pressure condition. This value is not determined by the software. Use the following description as guidance in determining the input that should be used. When a 3.5:1 safety factor is specified in the vessel screen, this value comes from Section II, Part D (Table 1A for Ferrous Materials, Table 1B for Non-Ferrous Materials, and Table 3 for Bolting). If a 4:1 safety factor is specified, this value is calculated based on the ultimate strength from Table U in Section II, Part D; furthermore, the value is limited to the values listed in the allowable stress tables for yield and creep governed cases.

Flange Cold Stress: The material allowable stress at the 70 °F (20 °C).This value is not determined by the software. Use the following description as guidance in determining the input that should be used. When a 3.5:1 safety factor is specified in the vessel screen, this value comes from Section II, Part D (Table 1A for Ferrous Materials, Table 1B for Non-Ferrous Materials, and Table 3 for Bolting). If a 4:1 safety factor is specified, this value is calculated based on the ultimate strength from Table U in Section II, Part D; furthermore, the value is limited to the values listed in the allowable stress tables for yield and creep governed cases.