Step 4-B

For the "Main"and "Basic Data" tab choose Rigorous HEM, for the direct integration method, API sizing, Design mode, Equilibrium, and "1", for no slip between phases,  to perform typical HEM direct integration method.  Set the "calculation scenario type" to "Fire" to transfer relieving pressure, heat of vaporization, and the two-phase fire relieving rate, from the "two-phase relieving rate" tab.