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  1. LeSabre

    solving Joule-Thompson pressure drop

    Davidowitz: Getting back to your problem, the Joules- Thompson effect applies to natural gas regulation. To approximate the outlet temperature, you can use the basic definition of Mu, the Joules- Thompson coefficient, Mu=(T2-T1)/(P2-P1) Note that the J-T effect is independent of V1 and V2...
  2. LeSabre

    Crane 410 fittings

    BigInch, Great site, thanks! But I didn't see any info on K-factors or ft.
  3. LeSabre

    Crane 410 fittings

    katmar, Thanks for directing my attention to your “rant”. I agree that the ft factor depends on geometry. Your j-factor theory, however, leads to the unlikely result that two different pipe I.D.s, say, 4” sch 40 (I.D. = 4.0260”) and 4” sch 160 (I.D. = 3.4380”) could have the same K-factor...
  4. LeSabre

    Crane 410 fittings

    pleckner, Great article. I appreciate your logical presentation. I am curious, however, about your representation that in 1979 Crane "...discussed and used the two-friction factor method for calculating the total pressure drop in a piping system...(f for straight pipe and ft for valves and...
  5. LeSabre

    Pressure correction for gas flowmeters

    Proton10, the expression your vendor gave you is correct for estimating a min flow rate for a turbine meter at a pressure other than its calibration pressure, assuming the specific gravity is 0.6 and the compressibility factor is 1.0. Check out equation B on page 4 of the attached PDF file...
  6. LeSabre

    software or tables of thermal properties for natural gas

    I think this link has every thing you need. Download ALLPROPS for Windows (v1.0). http://www.webpages.uidaho.edu/~cats/software.htm
  7. LeSabre

    Natural Gas Blowdown Data

    I’ve been kicking this around with Tony for a couple of months now and I agree with what he wrote. Maybe I can explain it a little better. The simple pressure vessel (PV) model does not take into account the geometry of the volume being vented. For illustration purposes, imagine a 10” pipe...
  8. LeSabre

    Natural Gas Blowdown Data

    Dear Colleagues: I'm writing a computer program to characterize a long pipeline under a free flowing blowdown (I’m calculating pressure decay, blowdown time, temp profile, etc). In order to check my calculations, I need specific data from actual blowdown operations. I need the length of the...

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