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steam flow calculation through a fixed orifice

steam flow calculation through a fixed orifice

steam flow calculation through a fixed orifice

(OP)
I am trying to calculate the steam flow through a fixed orifice of 2.125" diameter in a 3" pipe with an inlet pressure of 100 psig...  Can anyone help?

RE: steam flow calculation through a fixed orifice

You'll need the downstream pressure. Once you know the pressure drop, and the orifice size, it's just plug the numbers into the formula.

RE: steam flow calculation through a fixed orifice

If by outlet pressure you are referring to the downstream pressure, you will need the upstream pressure and proceed as TBP recommends.

rmw

RE: steam flow calculation through a fixed orifice


The velocity of gasflow through an orifice is limited to the speed of sound...



 

RE: steam flow calculation through a fixed orifice

115 psia inlet, nearly saturated steam 340F
3.068 inch pipe ID, inlet & outlet
2.125 inch sharp edged orifice Cd = 0.62

downstream pressure (PSIA) & resultant flowrate (LBm/hr)

114    3560
110    7,730
100    12,650
80    16,660
70 & less    17,300
 

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