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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.

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

Requirements

Per UG-23(e), calculate using: Select whether to calculate the allowable primary plus secondary stress using 3xS or 2xSy. Caution: If 3xS is selected and the value of S is determined at 90% of Sy, the allowable primary plus secondary stress will be 2.7xSy.

Use High alloy steel minimum thickness requirements: Select this box to use the minimum thickness requirements for high alloy steel (0.125", 3mm).

Fatigue

Design Cycles: Specify the number of design cycles for operation.

Fatigue Reduction Factor: The fatigue strength reduction factor is affected by many variables, including sharp corners, surface roughness, etc. Expansion joints that include these items should reflect this with a higher value. Higher values will lower the allowable fatigue strength of the design.

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