Calculation of NM3_hr and SM3_hr Gas Flow _ Enggcyclopedia
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Newest on Miscellaneous Home » Blog » Process Design » Thermodynamics » Calculation of NM3/hr and SM3/hr gas flow Calculation of NM3/hr and SM3/hr gas flow Sample Problem Statement What is the NM 3 /hr (normal cubic meter per hour) and SM 3 /hr (standard cubic meter per hour) flowrate corresponding to 100m 3 /hr of nitrogen flowing through a pipe? Operating temperature of nitrogen stream is 80 0 C. Operating pressure at the point of flow measurement is 25 bar. Normal temperature and pressure conditions to be used are – T = 25 0 C and P = Atmospheric pressure Standard conditions defined by NIST to be used. Solution The calculation of normal and standard gas flowrates (NM 3 /hr and SM 3 /hr calculation), first requires the normal and standard conditions to be fixed. Normal temperature and pressure conditions are already defined in the problem statement and standard temperature and pressure conditions defined by NIST are to be used. Normal Temperature T N = 25 0 C = 298.16 K Normal Pressure P N = 101.3 kPa (atmospheric pressure) From a list of standard temperature and pressure conditions defined by various organizations, the standards conditions defined by NIST are noted as, Standard Temperature T S = 0 0 C = 273.16 K Standard Pressure P S = 101.325 kPa The operating conditions are, Volumetric gas flow V = 100m 3 /hr Gas temperature T = 80 0 C = 353.16 K Gas pressure P = 25 bar = 2500 kPa Gas volume is directly proportional to temperature and inversely proportional to pressure. Hence, gas flow at normal conditions is calculated as, NM 3 /hr = V×(T N /T)×(P/ P N ) = 100×(298.16/353.16)×(2500/101.3) Gas flow = 2083.57 NM 3 /hr Gas flow at standard conditions is calculated as, SM 3 /hr = V×(T S /T)×(P/ P S ) = 100×(273.16/353.16)×(2500/101.325) Gas flow = 1908.4 SM 3 /hr Related Posts Standard Temperature and Pressure Conditions Venting Calculation – Outbreathing Vortex Flow Meter Mechanical flow measurement devices Pressure based flow measurement devices Related Pages Normal Venting Calculator – Outbreathing Flow Previous Next Reader Survey Calculation of NM3/hr and SM3/hr gas flow | Enggcyclopedia http://www.enggcyclopedia.com/2012/01/calculation-nm3hr-sm3hr-gas-flow/ 1 of 4 6/19/2012 10:01 PM
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Home » Blog » Process Design » Thermodynamics » Calculation of NM3/hr and SM3/hr gas flow
Calculation of NM3/hr and SM3/hr gas flow
Sample Problem Statement
What is the NM3/hr (normal cubic meter per hour) and SM3/hr (standard cubic meter per hour) flowrate corresponding to 100m3/hr of nitrogen flowing
through a pipe? Operating temperature of nitrogen stream is 800C. Operating pressure at the point of flow measurement is 25 bar.
Normal temperature and pressure conditions to be used are –
T = 250C and P = Atmospheric pressure
Standard conditions defined by NIST to be used.
Solution
The calculation of normal and standard gas flowrates (NM3/hr and SM3/hr calculation), first requires the normal and standard conditions to be fixed. Normal
temperature and pressure conditions are already defined in the problem statement and standard temperature and pressure conditions defined by NIST are to
be used.
Normal Temperature TN
= 250C = 298.16 K
Normal Pressure PN
= 101.3 kPa (atmospheric pressure)
From a list of standard temperature and pressure conditions defined by various organizations, the standards conditions defined by NIST are noted as,
Standard Temperature TS = 00C = 273.16 K
Standard Pressure PS = 101.325 kPa
The operating conditions are,
Volumetric gas flow V = 100m3/hr
Gas temperature T = 800C = 353.16 K
Gas pressure P = 25 bar = 2500 kPa
Gas volume is directly proportional to temperature and inversely proportional to pressure.
Hence, gas flow at normal conditions is calculated as,
NM3/hr = V×(TN
/T)×(P/ PN
)
= 100×(298.16/353.16)×(2500/101.3)
Gas flow = 2083.57 NM3/hr
Gas flow at standard conditions is calculated as,
SM3/hr = V×(TS/T)×(P/ P
S)
= 100×(273.16/353.16)×(2500/101.325)
Gas flow = 1908.4 SM3/hr
Related Posts
Standard Temperature and Pressure Conditions
Venting Calculation – Outbreathing
Vortex Flow Meter
Mechanical flow measurement devices
Pressure based flow measurement devices
Related Pages
Normal Venting Calculator – Outbreathing Flow
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