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  • Users: rsr32
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  1. rsr32

    Propane transfer re-visited

    I read up on the Corken document, very informative stuff. I did see the pressure/temperature correlation. I'm personally not very familiar with propane, the only real experience with LPG was as a refrigerant in a LNG liquefaction triple cascade system, and it is sub-cooled in that type of...
  2. rsr32

    Propane transfer re-visited

    I did look again at the K factors (K= (340)(ft) as in the case of the angle globe valve) and made sure to plug the value back in to the equivalent lengths formula: Le = (K)(D)/ft. I 'm double checking my work now but it's been a 13 hour shift so far and the eyes and mind are getting tired...
  3. rsr32

    Propane transfer re-visited

    here is where I stand at this point. I used 225gpm and calculated losses in the system based on the velocity at this Q value. It looks to be roughly about 18psi loss across the system. sounds a bit low to me? Liquid Friction Pressure Loss – 3” pipe sections w/ (2) EFV’s, (2) globe angle...
  4. rsr32

    Propane transfer re-visited

    thanks, I've been at it off and on over the course of the afternoon, juggling this and 30 other tasks and by now my brain is fried.. I seem to get stuck once I determined my equivalent pipe lengths on my minor losses and calculating the equivalent pressure drop to determine what my maximum...
  5. rsr32

    Propane transfer re-visited

    I will definitely try to get my hands on the Crane 410 book, sounds like they'll have to come way down on their original pressure for this to work..
  6. rsr32

    Propane transfer re-visited

    great help, thank you again. The documentation attached is a great resource as well. I will follow your advice and provide them with the recommendations regarding the pressure. It sounds like the flow created with 100 psid will exceed the EFV capacity so I'll have to work my way down to an...
  7. rsr32

    Propane transfer re-visited

    Thanks GH, very helpful info. I do indeed realize the added complexity due to the 2 phase condition present. Basically, from my understanding, this is the process they will be using , I was just asked to determine as a rough estimate and provide a calc, as to whether a 100 psid will create a...
  8. rsr32

    Propane transfer re-visited

    Hi, I need to conduct a product transfer operation but am not sure how to figure out if it will be possible or not. I'm in a bit rusty on my fluid dynamics and looking for some tips on how to approach this. I have 2 large capacity liquid propane tanks (24,000 gallons) both about 80% full and...
  9. rsr32

    Flow calculation

    any suggestions for a decent table of equivalent lengths for valves/fittings? can't seem to find any that list a value for 90deg angle globe valve..
  10. rsr32

    Flow calculation

    thank you katmar, I will search for these spreadsheets and calculators. for my purposes as far as this case, I don't need a high level of accuracy, the rough estimation I can get by simplifying the system is enough. unfortunately I do not have specs on the excess flow valves but I will continue...
  11. rsr32

    Flow calculation

    the vapors are actually controlled by a regulator, that feeds into a distribution system
  12. rsr32

    Flow calculation

    thanks all, I was hoping there was a quick and dirty way to get a rough approximation but it looks like I'll have to dig up the old fluid mechanics books and look at it closer Chicopee, yes you are right, I omitted the vapor return arrangement in the sketch for simplicity's sake. the...
  13. rsr32

    Flow calculation

    * the two excess flow valves are on the end of the 2" draw tube inside each tank.
  14. rsr32

    Flow calculation

    for the sake of simplicity, the flow can be considered to be all liquid. Again, all I'm looking for is a quick and dirty ball park figure, and that's all that's necessary to serve the purpose in this case. The 3" header length is 142" the two excess flow valve are on the end of 2" piping...
  15. rsr32

    Flow calculation

    Thank you for the reply David, the flow is assumed to be fully liquid, again all I really need is an approximation at best and to know that the flow is at least 250 GPM or more. So it sounds like I need to use the D'Arcy Weisbach equation in this case, and i assume I would have to calculate the...
  16. rsr32

    Flow calculation

    Hello, I have a 30,000 Gallon LPG tank about half full, that will be emptied into an empty second tank, through a piping arrangement. The first tank is pressurized using a compressor. The differential pressure created between the two tanks is 100 PSID I am trying to figure out an expected...
  17. rsr32

    Using cooling degree days to estimate energy consumption

    hmm that's what I figured.. no shortcuts. well i do have an estimated cooling load which is about 192,000 btu/h
  18. rsr32

    Using cooling degree days to estimate energy consumption

    I need to do a very simplistic and basic estimation of energy consumption of a new air conditioning system compared to a previous system. Is it possible to use Cooling degree day information to estimate how much and how often the unit will be running? basically without factoring in any...
  19. rsr32

    Question on Equipment Specs

    how do you come to the 4.6kW max power? why is that number different than the "power input" and what about the ceiling mounted unit which is a 39,000BTUH unit? sorry for all the questions, I'm a bit confused, and thanks for your help
  20. rsr32

    Question on Equipment Specs

    I have the spec sheet from a sanyo split cooling system , and am a bit confused as far as the power input specification: "Cooling Capacity (BTU/h): 17,500(4,000-17,500) Power Input (W) : 1500/1500(250-1500)" (http://www.sanyohvac.com/products.php?id=18KS72_18KLS72) I'm assuming the...

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