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  1. Glenfiddich

    Hysys vs Aspen Plus

    It seems like the only advantage that Aspen Plus offers over Hysys is the ability to handle some (trace) solids...which is a negligible feature as far as I'm concerned. I heard that Hysys is better than Aspen Plus because Hysys does not truncate the binary coefficients. Therefore Hysys is much...
  2. Glenfiddich

    hysys vs aspen one

    what's the difference between aspen one and hysys for hydrocarbon seperation simulations? i heard something about differences in binary coefficients. why is hysys and pro 2 the benchmark for refineries and why is aspen one not?
  3. Glenfiddich

    Vortex Breakers

    For vessels or tanks that have an outlet on the side, near the bottom tangent, isn't there still a possibility of vortexing when the liquid level is low-even if the liquid leaves from the side? Wouldn't a vortex breaker be good for an application where there isn't a pump, but a control valve on...
  4. Glenfiddich

    Hysis discrepancy with two phase slugs

    I'm using Hysis version 2006.5 and it appears that there's some contradictory calculations regarding slug flow. Using the slug calculation/prediction tool, it shows stable two phase flow. Great news! However, double checking with the flow regime map using beggs/brill or Aziz (horizontal pipe)...
  5. Glenfiddich

    2 phase flow correlation

    what's a good flow correlation for 2 phase? beggs/brill?
  6. Glenfiddich

    2 phase flows to/from heat exchangers

    ok, this is a subject which I don't think alot of process engineers care too much about. Why would you design a series of heat exchangers so that it creates 2 phase flow before it enters a flash drum? For example, you have 3 heat exchangers in series and then a flash drum. After the 2nd heat...
  7. Glenfiddich

    Simple question about motor current draw and power

    I'm wondering about the current draw from a constant speed pump motor. If the discharge control valve from a pump discharge is throttled more, would that make the motor draw more current and therefore increase the power? Or is the motor taking constant current regardless of what is happening...
  8. Glenfiddich

    Liquid ring vacuum pump start up

    Have you had experience with the start-up of the liquid ring compressors/vacuum pumps? Is it a fairly operator intensive start-up procedure? Can it be started on auto? or does it need more TLC from an operator to start-up? How much time would it take to start up a vacuum pump?
  9. Glenfiddich

    Vacuum Truck and NGL Tanker Trucks

    I have a couple of questions. First, for vacuum trucks; can they vac out class 1 flammable liquids? I would imagine they have some code about not vac'ing very flammable liquids. Second question is about tanker cars; what design pressure do they typically have? Also, what carbon number cut off...
  10. Glenfiddich

    VRU-Liquid Ring Compressors

    Would you have experience with using liquid ring compressors/vacuum pumps for a VRU? The water seal causes quenching and condensation of some HC and water vapors and the discharge gas from the separator is saturated vapour. In cold weather there's 2 phase flow on the discharge piping from...
  11. Glenfiddich

    Multistage vs Single Stage

    Would there be any advantage to use single stage pumps or multistage pumps? In my application, it would be cheaper to use a single multistage than two single stage in series. It would also take up a whole lot less room to house a single multistage with one backup. One long time pump salesman...
  12. Glenfiddich

    Emulsions

    would you have a good article or reference to emulsions 101? i'd like to understand how they are formed and the basics. i have had experience with emulsions created in slop tanks. the emulsion had a viscosity of 10,000 cP, if i recall correctly. are emulsions even pumpable, with that kind of...
  13. Glenfiddich

    PSV Inlet Piping 3% rule

    From API 520 Part 2 Section 2, it talks about the 3% limitation on inlep PSV piping. What if you have a situation where you have liquid going to the PSV and the liquid head in the PSV inlet line exceeds the 3% of the set pressure? Would this be considered a violation of the 3% rule? The...

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