Step 2

We will now use DIERS methodology to perform a two-phase test to determine if two-phase flow is likely for our single-phase Fire case.  The two-phase test is  based on an article by Harold Fisher , An Overview of Emergency Relief System Design Practice".  Union Carbide Chemicals and Plastices Company, Inc.

Step 2-A

Two-Phase Test

To perform the two-phase test the user can transfer his single-phase vapor/gas flow rate.   And also transfer the vessel cross-sectional area, and vapor volume fraction, from the the two-phase "Vessel Volume Calculator" tab results below.