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I have an orifice flow that is being compensated, And I have a few questions.
The max range of the orifice is calculated at 6110000scfh@ 104psiget dp with flowing density of .21lb/ft3, and base density of .022 lb/ft3. The dcs formula is compensated flow= uncompetitive flow(scfh) *sqrt((p+po/rp)*(rt/t+to)* (rmw/mw).I have an online analyzer which gives sg, a pressure guage, and a temp guage.
The dcs calculates MW=sg*.78*10.73*((t+460)/p+14.7)).
1st
What is the .78 constant?
Since I have an online analyzer would my flow still be correct if the properties change? I am concerned if I calculated the orifice using the wrong density then the flow might be incorrect,but since I have an online analyzer I am thinking it will correct this? I really would like to see the math behind why it does not matter what base density, and flowing density I use in the orifice cal the correction factor still corrects (if this is the case).
The max range of the orifice is calculated at 6110000scfh@ 104psiget dp with flowing density of .21lb/ft3, and base density of .022 lb/ft3. The dcs formula is compensated flow= uncompetitive flow(scfh) *sqrt((p+po/rp)*(rt/t+to)* (rmw/mw).I have an online analyzer which gives sg, a pressure guage, and a temp guage.
The dcs calculates MW=sg*.78*10.73*((t+460)/p+14.7)).
1st
What is the .78 constant?
Since I have an online analyzer would my flow still be correct if the properties change? I am concerned if I calculated the orifice using the wrong density then the flow might be incorrect,but since I have an online analyzer I am thinking it will correct this? I really would like to see the math behind why it does not matter what base density, and flowing density I use in the orifice cal the correction factor still corrects (if this is the case).