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  1. will48

    choked flow pressure profile in vent lines

    I'm looking at a vessel vent line, which will be used to manually depressure a vessel containing light natural gas at 100 barg to an atmospheric vent header. The line is equipped with a restriction orifice and downstream of the RO passes via several collection headers, all of increasing size...
  2. will48

    Fire relief load (vaporization+expansion)

    OK, thanks Latexman for getting the ball rolling. Yes, the separator is typically 30%-60% liquid filled (oil + produced water). So my understanding is that the total relief load for fire case is vapour generation from heat input to wetted area (Eq.(3/4) in API521) + expansion of gas in the...
  3. will48

    Fire relief load (vaporization+expansion)

    Colleagues, When performing a fire case relief calculation, API521 equation for heat load against wetted area (Q=21000A^0.82, etc.) will give a relieving load due to vaporization. Do I also need to include an additional load due to gas expansion in the vapour space (Equation 8 in API521, W =...
  4. will48

    Cold temperatures upstream of valve

    Montemayor I will forgive the abrupt opening to your response on account of your long history of politeness and patience. I was merely asking for an order-of-magnitude feel, not a transcript of the calculation, hence the lack of data supplied. Two of your final three sentences were sufficient...
  5. will48

    Cold temperatures upstream of valve

    Does anyone have a feel for (or ideally some reference to) how far UPSTREAM cooling will take place in the pipe wall at a valve in gas service with a high dP. In other words, a hydrocarbon gas at ~140 bar is depressured to flare (atmospheric + nominal back-pressure) via a globe valve. Valve and...
  6. will48

    Cp/Cv correction in Hysys

    The Cp/Cv value in Hysys is the 'actual' value, based on the equations of state in thermodynamic package you are using. You can calculate the 'ideal' value by the following formula: Cp/Cv (ideal) = Cp / (Cp - R) where Cp = molar heat capacity of gas stream (kJ/kmolK) R = universal gas...
  7. will48

    'Stock Tank' & 'Shrinkage' definitions

    Colleagues Please can you offer a definition of the terms 'Stock Tank' (as in Stock Tank Conditions) and 'shrinkage'. Is Stock tank condition the same as standard condition (1 atm, 60°F)? Thanks jw
  8. will48

    'Stock Tank' & 'Shrinkage' definitions

    Colleagues Please can you offer a definition of the terms 'Stock Tank' (as in Stock Tank Conditions) and 'shrinkage'. Is Stock tank condition the same as standard condition (1 atm, 60°F)? Thanks jw
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