ANSI FLANGE REDUCTION OPTIONS code case 2901

Dear all, it is the first time I need to use this, and I don't find any info in the help topics, about the results between different methods. I only find th following:

Input
Axial Force on Flange 5000.00 Kgf
Bending Moment on Flange 1000.00 Kg-m.

Output
Original Design Pressure for Flange 1.000 bars
Axial Force Equiv. Pressure (4*max(F,0)/(pi*G^2)) 2.411 bars
Bending Moment Equiv. Pressure (16*abs(M)/(pi*G^3)) 3.791 bars
---------
Final Equivalent Design Pressure 7.202 bars


Note:
Per ASME NC-3658.1(b), the equivalent pressure is used only
to compute the Hydrostatic End Load H. The original design
pressure is used in the remaining calculations.

The methods are :

Kellogs
PVP Method
50%stress method
DNV Method

but all gave the same results in the report