Convert cv to cg
Convert cv to cg
(OP)
Can anyone help....
How do convert cv to cg ?
I know that cv = constant x kg
Cv [US Gallons/min/psi] = 0,03445 KG [m³/h/bar] (related to natural gas, density = 0,83 kg/m³) ( by manufacture)
Note: But the service that valve is for H2. Is valid the same relation or the constant is different ??.
Thanks.
How do convert cv to cg ?
I know that cv = constant x kg
Cv [US Gallons/min/psi] = 0,03445 KG [m³/h/bar] (related to natural gas, density = 0,83 kg/m³) ( by manufacture)
Note: But the service that valve is for H2. Is valid the same relation or the constant is different ??.
Thanks.





RE: Convert cv to cg
Divide by the specific gravity of your gas to adjust for gases other than air.
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Convert cv to cg
(densidade = 14,55 kg/m3 ; Z=1,084; cp/cv =1,45)
cv ou kv ?? please is urgent
considering :
Cv [US Gallons/min/psi] = 0,03445 KG [m³/h/bar] (related to natural gas, density = 0,83 kg/m³) ( by manufacture)
RE: Convert cv to cg
C1=39.76*(Xt)^0.5
RE: Convert cv to cg
RE: Convert cv to cg
"Xt ???"
I should have clairified. This formula is from Fisher Control Valve. Xt is another coefficient they assumed we needed.
RE: Convert cv to cg
How??
RE: Convert cv to cg
RE: Convert cv to cg
As said, Cg = C1 * Cv.
I'll typically look up the C1 as it varies depending on the type of control valve, conventional style globe valves are usually around 30 but it can be quite a bit lower
If you can clarify what you want it would help, the hydrogen conditions by itself doesn't have anything to do with the Cv or Cg.
RE: Convert cv to cg
I clipped this from the bottom of one of Fisher's coefficient's pages. It is in each of their control valve pdf files.
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Conversion of Sizing Coefficients
Following are conversions for use with other common sizing equations.
Kv = (0.865)Cv
C1= 39.76(XT)^0.5
Cg = CvC1
Km = FL^2
Cs = 1/20(Cg). Cs is only applicable for inlet pressures up to 70 bar(a)
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psafety
RE: Convert cv to cg
ht
**********************
"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Convert cv to cg