PSV two-phase HEM vs. API OMEGA vs HNE...
PSV two-phase HEM vs. API OMEGA vs HNE...
(OP)
problem : PSV sizing for two phase (vapor+liquid) flow for HC mixtures
comment : I observe quite large differences 20/25% and more with different methods as HEM (API Omega) HEM (rigorous) HNE and HNE-DS, not sure which is the most accurate, In some cases HNE and HNE-DS return reduced areas (which seems in agreement with the description of these methods), API OMEGA (HEM with simplified parameters) shows large variations compared with rigorous HEM etc.
All calc's done with PRODE PROPERTIES , verified with proprietary software (Farris etc.)
question : in these cases (different methods giving different results) should I select the largest area ? (which is my rule)
comment : I observe quite large differences 20/25% and more with different methods as HEM (API Omega) HEM (rigorous) HNE and HNE-DS, not sure which is the most accurate, In some cases HNE and HNE-DS return reduced areas (which seems in agreement with the description of these methods), API OMEGA (HEM with simplified parameters) shows large variations compared with rigorous HEM etc.
All calc's done with PRODE PROPERTIES , verified with proprietary software (Farris etc.)
question : in these cases (different methods giving different results) should I select the largest area ? (which is my rule)





RE: PSV two-phase HEM vs. API OMEGA vs HNE...
I would not consider the differences in different variants, for example in API OMEGA (which is a HEM with simplified parameters) vs. the rigorous HEM included in PRODE PROPERTIES,
the point is that HNE models can give (in some cases) very different results and being included in standards (see the case of HNE-DS which is a HNE with simplified parameters and possibly included in ISO 4126) it is difficult to judge when adopt a reduced area or not,
that is not an easy question to answer,
personally I feel safe with HEM
(which in general is more conservativa than HNE)
but you may find different opinions.
RE: PSV two-phase HEM vs. API OMEGA vs HNE...
I suppose I should do that (i.e. choose the conservative approach)
altough costs are a important factor for final decision.
RE: PSV two-phase HEM vs. API OMEGA vs HNE...
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.