Thin Wall Expansion Joint - Displacement/MDMT

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

Displacement Information

Initial Position Axial Displacement: Enter the initial position as compared to the neutral position at design conditions. If the initial position is the neutral position, enter zero. This value may be positive or negative.

Final Position Axial Displacement: Enter the final position as compared to the neutral position at design conditions. If the final position is the neutral position, enter zero. This value may be positive or negative.

Initial Position Lateral Displacement: Enter the initial position as compared to the neutral position at design conditions. If the initial position is the neutral position, enter zero. This value must be positive.

Final Position Lateral Displacement: Enter the final position as compared to the neutral position at design conditions. If the final position is the neutral position, enter zero. This value must be positive

Initial Position Angular Rotation: Enter the initial position as compared to the neutral position at design conditions. If the initial position is the neutral position, enter zero. This value is entered as degrees but will be converted to radians in the mathematics to be consistent with Appendix 26 calculations.

Final Position Angular Rotation: Enter the final position as compared to the neutral position at design conditions. If the final position is the neutral position, enter zero. This value is entered as degrees but will be converted to radians in the mathematics to be consistent with Appendix 26 calculations.

Perform MDMT 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

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 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.