How to Convert Lbs/Mmscf to Ppm

Written by leslie renico
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How to Convert Lbs/Mmscf to Ppm
Blocking in these pipes due to gas hydrates could cause major problems -- and quickly. (Medioimages/Photodisc/Photodisc/Getty Images)

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.

Skill level:
Moderately Easy

Things you need

  • Hygrometer

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  1. 1

    Measure the water presence in your gas pipeline using a single-channel dew point hygrometer. Set the units desired to lbs/MMSCF.

  2. 2

    Multiply your lbs/MMSCF reading by 21 to get parts per million of water. This constant applies regardless of temperature.

  3. 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 3.18kg/MMSCF, or 147 ppm. In Canada, though, it's 1.81kg/MMSCF, or 84 ppm.

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