Air quality regulations customarily express limits based on the mass amount (e.g. Oil company field operations and engineering departments think in terms of the volume of gas since the volume produced will be normally be reported as standard cubic feet (SCF) at 60☏ and 14.7psia (see Reference 1 below). Typically, for air quality regulatory calculations for natural gas and its components, an ideal gas is assumed and compressibility factors ( Z-factors) are not used. 379.3 SCF at standard conditions of 60☏ and 14.7psia (see Reference 1). The ideal gas law conversion factor used above is based on the relationship of 1 lb-mole of an ideal gas occupies approx. total gas in SCF = (lbs natural gas)*(379.3 SCF/lb-mole)÷(MW of gas in lbs/lb-mole)
Standard cubic feet (SCF) at 60☏ and 14.7psiaĮquation 1: Weight in lbs of total gas = (SCF)*(1 lb-mole/379.3 SCF)*(MW of gas in lbs/lb-mole)Įquation 2: Weight in tons of total gas = (lbs of natural gas)(1 ton/2000 lbs)Ĭonverting from pounds (lbs) of natural gas to volume of natural gas in SCFĮquation 3: Vol. Converting from volume of natural gas to pounds (lbs) of natural gas in SCF Below is a sample calculation with equations to use. Below are some equations to use with a more detailed explanation later in this blog topic.Ĭonversion of natural gas volume to weight (mass) requires the volume of gas in standard cubic feet and the molecular weight of the natural gas. People often ask how do convert a volume (e.g., standard cubic feet) of natural gas to pounds (mass) and pounds of natural gas to volume.
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