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This may be an easy one, I have found an old thread (thread181-27567) about converting m3/hr to English conversion but, I would like to know conversion factor from Nm3/hr to m3/hr. I did find a web site that used m3/hr=Nm3/hr X 1.17 but I would like this confirmed. I can't seem to find published data. Thanks, in advance.
Concerning the conversion of ppmv to mg/Nm3, they are two factors to consider: the temperature/pressure and the O2%. Nm3 stands for "normal" or "standard" cubic meter from the perfect gas equation. You therefore have to correct both parameters to obtain an accurate value.
To convert to ppm, multiply the result by 10^6. Thus the final equation is: (mg/m3)* (22.4/MW)= PPM or 1,200* (22.4/64.06) = 420 ppm. It appears the difference here between my result and 25362's is that I calculate a pure vapor phase density of 2.860 mg/ml, not the quantity used by 25362. I would expect this is a tabulated value based on ...
Metric Equivalent is Nm3/m3 (Normal m3 of gas per m3 oil produced) The units don't cancel..they are also refered to as cubes...so many cubes of gas produced per cube of oil. The important thing to note is not the volume conversion, but that STP for NGPSA (14.7 psia, 60 F) is different than a metric STP (1 bar at 20 C.)
Flow [Nm3/h] = MassFlow [kg/h] * 22.4136 [m3/kmol] / Mol. Weight [kg/kmol] which is commonly recalled in litterature for the subject reference conditions would deviate from a calculation that takes into account real gas compressibiity effect (i.e. via Equation of State) in order to determine Density @ (Tref, Pref) - see [2] below:
If you have 1 SCF (60 deg F, 0 psig) then you have 0.0269 Nm3. Best regards. Morten. mbeychok (Chemical) 21 Jan 08 11:21. egebull: MortenA forgot to say that 1 scf at 60 deg F and 0 psig equals 0.0269 Nm3 only when the Nm3 is defined as being at 0 deg C and 1 atmosphere (absolute).
If you need to convert between normal cubic meters and standard cubic feet use the following conversion. 1 Nm3 @ 0 deg C & 1 atm => 37.326 standard ft3 @ 60 deg F & 1 atm. Ifakiz (Chemical) 27 Sep 06 11:08. In Okwori FPSO,we convert from mscfd to m3/h like this though we deal with oil but try it out.
The case is that 100 m3/h liquid ethanol is pumped into an ethanol storage tank, displacing 100 m3 of ethanol vapor. The set pressure of the valve is 1 barg / 15psig (still within limits API-2000), temperature 25 degrees, vapor density 3 kg/m3. If I understand correctly, the required relief capacity for this particular case is: 202 Nm3/h ...
Nm3/h is commonly used as a unit of measure for flow of compressible fluid (e.g. vapour) because the volume varies with pressure. If your flow is LIQUID ammonia then you can pretty safely assume that this is incompressible and thus volume does not vary with pressure (density is constant with pressure). Simply divide the kg/h by density (kg/m3 ...
What I have experienced so far Nm3/hr is the volume flow considered at 0°C and 1 bar (absolute). Sm3/hr is the flow taken at 15°C and 1 atm (1,013 barA). However, the 15°C is sometimes subjected to dicussion: 20°C is taken as well. Conversion can easily be made by using (P*V)/T = C. Regards, Kingsss.