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  1. blackwed

    Compressed air to fill a tank

    It's been a good day[pipe]
  2. blackwed

    Fundamental Question about Dynamic Pressure.

    A Newton is a kg-m/sec^2.
  3. blackwed

    Compressed air to fill a tank

    I'm not giving engineering advice or direction because this is outside my field of expertise, but try this for an approximation. ME's please fix it as required. Vdot=sqrt{2[g(H1-H2)+((P1-P2)/rho)]} Vdot is volumetric flow rate of fluid from tanker g is acceleration of gravity H1 is height of...
  4. blackwed

    Compressed air to fill a tank

    Are the trucks carrying a liquid?
  5. blackwed

    Compressed air to fill a tank

    FlyFisher, How do you offload now? How long does it take?
  6. blackwed

    Compressed air to fill a tank

    It'll take some more info to give you what you want. Are you using air to force liquid out now or are you wanting to speed up a current gravity process? What's in your truck? What size is the offload piping system onboard and offboard? Any flow controls, pumps, meters, air eliminators...
  7. blackwed

    Siphon Effect in diesel fuel pipeline.

    Bingo! DB
  8. blackwed

    higher upstream static pressure!

    How many/which of the three energy components--velocity head, pressure head and static head--in Bernoulli's equations contribute to the readings on the gauges in the 2-different-diameters-of-pipe example? A gauge clearly does not indicate total energy content since the readings go down in the...
  9. blackwed

    Siphon Effect in diesel fuel pipeline.

    I understand how a siphon works. My confusion was self-inflicted in that I hadn't considered until just now that, as katmar already said, the pipe could be too large or the initial flow rate too small to allow the pipe to be completely filled. My experiences have been with fish tanks, backyard...
  10. blackwed

    Siphon Effect in diesel fuel pipeline.

    Beg to differ, but you're very wrong--I am confused!! But I think it's a matter of semantics though. Please bear with me, I am electrical, but the general concepts of this are directly related to my work so I do have more than an academic interest in them. I always thought a siphon worked off...
  11. blackwed

    Siphon Effect in diesel fuel pipeline.

    I'm confused. One tank is 33 feet above another tank. You move fuel down to the lower tank and the concern is whether or not it will flow back up to the higher tank? I don't see how any piping configuration would cause this to happen as long as the liquid level in the lower tank is lower than...
  12. blackwed

    Measuring Bag Volume

    The rub is that PV for the tank isn't constant in your case. There's a different mass of gas in the tank after filling the bag than before. PV=nRT? Maybe you could figure out the number of moles of gas released from the tank based on its new pressure (assuming all other parameters remain...
  13. blackwed

    Compressibility value of Jet A1 fuel

    :)
  14. blackwed

    ASME 80:10 Flanged and Dished heads

    Look thru these guys' stuff. http://www.pveng.com/Charts/Charts.htm DB
  15. blackwed

    Air flow through openings

    Atmospheric tank? I would guess the flow rate is the same as fluid flow into or out of the tank. DB
  16. blackwed

    Compressibility value of Jet A1 fuel

    Per API's latest MPMS, the volumetric correction factor for effects of pressure on liquid (CPL): CPL=1/(1-(10^-5*Fp*P)) Fp=exp(-1.9947+.00013427*TempF+(793920+2326*TempF)/SG^2) P=psig SG=specific gravity at 60 deg F DB
  17. blackwed

    home heating oil change in volume due to temperature change

    CTL = Correction factor for effects of Temperature on Liquid. Volume x (1 +/- (0.0005 x delta Temp)) is as good a number to use as any other for a fairly close estimate in a home heating oil tank. Use + for a temperature increase and - for a decrease. Don't plan to take anybody to court...
  18. blackwed

    home heating oil change in volume due to temperature change

    Nope. It isn't as easy as I'm sure you're hoping. API's most current document that covers this goes for around $500 on CD. But for a start, go to DynamicFlowComputers.com and in the download section get the manual for their SFC332 flow computer. In the back are the formulas necessary to...
  19. blackwed

    PD Pumps to Meter Flow?

    Just a bit of anecdotal evidence for you. I was once at a bulk facility that used a 400 gpm PD pump in a tank truck offload bay for jet fuel. They consistently offloaded 8000 gallon trailers in 20 min +/- a few seconds. Obviously not the accuracy needed for some processes, but if you only...
  20. blackwed

    conversion of angular acceleration

    Could you pass along an example application where the units of deg/deg^2 would be used? I don't get it. I see deg/sec^2 as the time rate of change of angular velocity (deg/sec)/sec. I'm electrical in discipline and just can't seem to tie a ribbon around the meaning of (deg/deg)/deg...

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