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How to Convert Lbs/Mmscf to Ppm Converting pounds per million standard cubic feet (lbs/MMSCF) to parts per mole (ppm) is an important mathematical calculation when determining the proper water content for a gas pipeline. If you have too much water in your pipeline, gas hydrates will start to develop, and these can turn into a clog and block the pipeline.
Instructions 1.
Measure the water presence in your gas pipeline using a single-channel dew point hygrometer. Set the units desired to lbs/MMSCF.
2.
Multiply your lbs/MMSCF reading by 21 to get parts per million of water. This constant applies regardless of temperature.
3.
Compare your findings with the norms for the country or region through which your pipeline travels. In the United States, the accepted maximum water presence is 7 lbs/MMSCF, or 147 ppm. In Canada, though, it's 4 lbs/MMSCF, or 84 ppm.
Do you have an idea or website that can help me to convert mol fraction of water in gas to l b water/MMscf and then to mg/m3. Start with 100 moles of wet gas. Moles of water = mol fraction * 100 So now you have moles of water Multiply by 18, and you get lbs. of water. Moles of gas = 100 - moles of water. At what I call STP = 60F & 14.696 psia, 1 mole = 359 scf (Always take the small extra effort to specifically define what YOU mean by STP.) Moles of gas * 359 = scf of gas Divide by 1,000,000 to get MMscf of gas Now you have lbs. of water & MMscf of gas. Divide former by latter to get your answer. y (mole fraction of water vapor) multiply y by 792000 to obtain kg/Mstd m3 multiply y by 47484 to obtain lb/MMscf (@ 14.7psia & 60F).
