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...
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...
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...
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...
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...
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...
