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# ppm

## ppm

(OP)
hi
can i convert (x ppm)  of water contaned in gas to (y lb/MMscf).
if it's possible please give me a method of calculation.
thanks

### RE: ppm

First, you have to specifically identify what parts per million you are referring to: mass or volume?

PPMs are just like temperature (celcius or fahrenheit?), pressure (absolute or gauge?), and % (of what?).

### RE: ppm

(OP)
it's a weight ppm

### RE: ppm

It is not possible to convert lb water/million lbs of gas to lb water/million Scf without first establishing the molecular weight of the gas in question.

If you do know the dry gas's molecular weight, then the conversion can be done as follows:

lb water/MM Scf = (lb water/MM lb gas)(mol. wt. of gas)/(379.5 Scf)

The above Scf value of one lb-mol is measured at 70 oF and 14.696 psia - as per the NGPSA.

(OP)
thanks

### RE: ppm

1 % = 10 000 ppm (or 10 000 parts / 1 000 000 parts = 0.01 = 1%)

"We don't believe things because they are true, things are true because we believe them."

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