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  1. GaTechTheron

    HYSYS Dynamic Initialization

    I have a model that drifts a bit from my initial settings. Instead of going back to steady state to reinitialize I would just like to set the values. I put a stream off by itself and specified the composition, temp, and pressure. I used this stream to initialize other streams. I had to do it...
  2. GaTechTheron

    Excel Peng Robinson Vapor Liquid Ratio

    This is helpful, thank you ! I can use this with other somewhat related problems I'm working to solve.
  3. GaTechTheron

    Excel Peng Robinson Vapor Liquid Ratio

    Very helpful, and thank you, this calculation is confirming what I was afraid of. My case is isothermial flash. The solution is both iterative, and a very large number of equations for a mixture of say 10-12 components.
  4. GaTechTheron

    Excel Peng Robinson Vapor Liquid Ratio

    I need determine the ratio of liquid to gas, of a flashing LNG mixture. I'm using Peng Robinson EOS, and I cannot use HYSYS, refprop, or any external tool to Excel. I have the flash calculation working, so I have all fugacitys and relative composition of liquid and vapor for all components...
  5. GaTechTheron

    Flash Point Limit for Dispensing to Open Drain System

    Latexman, I agree with that point, and thank you.
  6. GaTechTheron

    Flash Point Limit for Dispensing to Open Drain System

    Latexman, To me, it actually does address safety by giving facility requirement in order to avoid dangerous situations (flame restorers are required when flash is <100F). Question is whether or not safety is fully covered by the standard, perhaps. Would NFPA30 be the right answer (beyond...
  7. GaTechTheron

    Flash Point Limit for Dispensing to Open Drain System

    Can a liquid with a flash point at 0[C], but RVP around 3[psia] go to an open drain system? According to API2000, it seems our atmospheric tanks can handle the liquid provided that they meet some venting requirements (flame arrestor, etc), but its unclear if this liquid can be drained from...
  8. GaTechTheron

    Design Press/temp - Low Press &amp; High Temp, OR High Press &amp; Low Temp??

    Degree: Mechanical Engineer Location: Houston, TX USA Experience: Rotating Equipment Design & modular skid Fabricator (4yrs), EPC (2yrs), Owner (4 Years) Position: PM Question: So I have seen this scenario a few times in my career, but would like to better understand what a pressure vessel...
  9. GaTechTheron

    Vacuum Blower Failure

    It cannot be hydrolock in this case. The liquid that is fed to the blower as "seal oil" is actually from a knock out put just downstream of both vacuum pumps. Therefore, unless a very large slug somehow got into the blower, it could only (at steady state) recirculate what is being knocked out...
  10. GaTechTheron

    Vacuum Blower Failure

    Yes this is a roots type vacuum blower. What are the symptoms of too much liquid? If the liquid changes phase from upstream to downstream of the blower what are the symptoms, and does this cause damage. Thanks, Theron
  11. GaTechTheron

    Vacuum Blower Failure

    Have a vacuum blower just upstream of a liquid ring vacuum pump that is failing. We inject seal oil just upstream of the vacuum booster blower for the purposes of sealing/cooling. This liquid that we are using as "seal oil" is actually from the knock out pot just downstream of the liquid ring...
  12. GaTechTheron

    Application of Queuing Theory to Determine Terminal Scope

    bigInch, I have seen these terminal management softwares (specifically the one that Honeywell sells), but this is not the type of problem I am trying to solve (at the moment). The problem I have now is... do we build 10 new dock lines, or can we get away with 1 dock line, and flush after every...
  13. GaTechTheron

    Application of Queuing Theory to Determine Terminal Scope

    Thanks BigInch. You never cease to amaze me. It will take me some time to digest all of this information, and determine if I can relatively easily apply it to this scenario (as DIY). I'll have to revert. Thanks, Theron
  14. GaTechTheron

    Application of Queuing Theory to Determine Terminal Scope

    We are expanding a terminal to account for a processing facility that we are building. There are some areas that we can save money by combining long lines to docks/rail/truck loading (with multiple different product loading streams) at the expense of product quality / line cleaning. To...
  15. GaTechTheron

    OSHA 33 CFR 155.780 - Emergency Shutdown

    It seems to me that so long as an operator, with a radio, is standing next to the valve at the dock, then we can meet this criteria. Thoughts?
  16. GaTechTheron

    OSHA 33 CFR 155.780 - Emergency Shutdown

    We have ULSD being imported into the terminal. Does this fall under the definitoin of an oil product since it is a "refined product?" 33 CFR 151.05 - Definitions “Oil” means petroleum whether in solid, semi-solid, emulsified, or liquid form, including but not limited to, crude oil, fuel oil...
  17. GaTechTheron

    High Pressure Hydrotreater - Block Valve on Chg Heater and Stripper Heater discharge?

    If I remember correctly, I believe we used a spec blind for this purpose on the last hydrotreater I built.
  18. GaTechTheron

    Pump Seal Plan 53A and Plan 53B

    To be honest, there will be no pump damange, but there will be seal damange. The seal has springs that hold the seal faces together. This tensions is adjusted based on the pressure differential across the seal and the size of the seal faces (i.e. the seal application) to ensure that proper...
  19. GaTechTheron

    Gear pump pressure

    You are correct. In the ideal case, the pump will deliver whatever pressure is required to maintain the flowrate. This is the basis of a positive displacement pump. Note that as pressure builds, your motor will likely being to slow down, and fluid slip in the pump will increase, therefore you...
  20. GaTechTheron

    Indifferent pumps in parallel

    Take the pump curves and at each head increment, add the flowrates. Assuming that both pumps pull from the same header (i.e. the suction pressures are identical), the line losses between the pumps and pipe section (where each stream meet) are accounted for, you will have an accurate model of...

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