A bursting disk manufacturer has provided an equation for the calculation of relief forces as witnessed upon rupture. which equates to:

F=2PA

P=Burst disc rating
A=Discharge area


My questions are:

1. Are bursting(rupture) disk event comparible to
relief valve events.
2. should a DLF apply? (Dlf=2 assuming rupture is instantaneous?)
3.are there any rules of thumb regarding imblances of forces as the event travels through a multi elbow system? (ie at which point does the distance between elbows on the discarge become sgnificant.)