FDBR is similar to Code-Specific Settings in most requirements. For more information, see Code-Specific Settings.
Calculate reinforced tees using FDBR
FDBR limits the pad thickness to a maximum equal to the header thickness. If you enter a pad thickness that is greater than the header thickness, the software overrides it with the header thickness.
Calculate reduced intersections using FDBR
Treat intersections similar to ASME NC. For more information, see ASME NC.
Calculate butt welds using FDBR
Use either 1.0 or 1.8 depending on the thickness.
Calculate flexibility analysis using FDBR
You must use the Hot Modulus of Elasticity in your flexibility analysis.
Calculate the expansion case allowable stress using FDBR
Wen computing the expansion case allowable stress,you must include the ratio of Ehot to Ecold. You can override the software-computed ratio by manually entering a value for Fac.
Calculate reducers using FDBR
The value for the flexibility factor is 1.0 and the equation to calculate reducer SIFs is:
2.0 max or 0.5 + .01*alpha* SQRT(D2/t2)
Where:
D1 - Diameter of the Large End
t1 - Thickness of the Large End
D2 - Diameter of the Small End
t2 - Thickness of the Small End
Alpha - Reducer Cone Angle in Degrees
When not entered:
Alpha = atan[ 0.5 * (D1-D2) / (0.60 * length of the reducer element) ]
Alpha cannot exceed 60° and the larger of D1/t1 and D2/t2 cannot exceed 100.