flow through orifice
flow through orifice
(OP)
Can someone tell me, the gas flow volume through an orifice, calculated from the common formula given by different vendors, is at upstream pressure or downstream pressure?
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RE: flow through orifice
RE: flow through orifice
A = Area of Orifice 0.134 Sqr. Inch
F = Factor 6.32
M = Molicular Weight of N. Gas 17.4
T = Temperature, oR, (oF+460) 560
Z = Compressibility Factor 0.97
C = Gas Constant 344
K = Valve Constant 0.878
k = Specific Heat Ratio 1.27
Kb = Back Press. Correction Factor 0.8
Ps = Set Pressure, psig 275
Po = Over Pressure of Set Press. 0.1
Pa = Atmospheric Pressure, psia 14.7
P2 = Back Pressure, psig
P = Pressure absolute 317.2
A = V x MTZ / FCKPKb
V = Flow Rate, SCFM 667
RE: flow through orifice
M
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Dr Michael F Platten
RE: flow through orifice
RE: flow through orifice
this appears to be a restriction orifice or possibly a relief valve as no d/p is provided, and there are curious mentions of a "valve constant" and a back pressure correction factor.
RE: flow through orifice
case in point, the "pressure absolute" = the set pressure + 10% + 14.7 psia.
just follow the instructions in the AG sizing manual. It is very clear. You will also find excellent engineering support from the factory.