What formulas and how AutoPIPE calculates the accelerations of the valves, equipment and different points of a model?
There is no equation persay for this, it is a process. The acceleration is read off the response spectra at the frequency of the natural frequency and applied to the mass acting. With a spectra, if the NF=1hz the acceleration is 0.1g.
"Acceleration" sub-report
Bentley AutoPIPE