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  1. CJC0117

    Rating a Variable-Area Pipe Using DIERS Methodology

    The method used by DIERS for two-phase, homogenous pipe flow is isenthalpic HEM numerical integration. For a constant-area pipe, pressure increments are made from the upstream pressure, P1, to the pressure at the exit of the pipe, P2 (which may or may not be the choked pressure), and then length...
  2. CJC0117

    Resistance to Flow Method for Rupture Disks in Two-Phase Flow Service

    Does anybody know if the Resistance to Flow Method explained in Appendix E of API 520 Part 1 can be used to verify the capacity of rupture disk in two-phase flow service? The equations API uses are compressible flow equations from Crane Technical Paper No. 410. I'm thinking that two-phase flow...
  3. CJC0117

    how to find two-phase mass flow rate (not mass flux)

    Hi all, I am trying to figure out how to size a PRV for two-phase flow. All the sizing calculations I've come across give methods like HEM or the Omega method in order to find the maximum two-phase mass flux, G. Then the formula A=W/(K*G) (where A is required orifice area, W is the mass flow...
  4. CJC0117

    Sizing for Two-Phase Liquid/Vapor Relief - What to do if vapor quality is not known

    Hi everyone, I am a process engineer and I've been trying to find a method for sizing relief devices for two-phase vapor-liquid venting without the need for software/equipment like SuperChems, VSP2, or RSST (I know I would probably need these for reactive systems, but for now I am only...

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