Water Dew Point in Natural Gas

[cpwrocky]

I wonder if anyone can point me in the right direction on this question. I have 7 lbs/mmcf water vapor in natural gas at atmospheric pressure. What is the water dew point temperature? At 3,600 psi? Where do I find the curve or method to calculate this?

Any help would be greatly appreciated. I had heard that GRI or GPSA had developed curves for this but have not had luck locating anything.

 

[SooCS]

Extra-polating from the GPSA chart, the dew point is about 50 oF and the hydrate temp is above 70 oF.

 

[cpwrocky]

Thanks - Is that data for the gas at 3,600 psi, or atmospheric? I was looking for both. Also, what book can that curve be found in or can it be purchased separately? I may need to purchase it, as we will be sampling this gas stream regularly for fuel quality maintenance (Compressed nat gas for NGV's)

 

[SooCS]

The water dew point of natural gas at atm pressure is about -40 oF and ice temp is ofcourse 32 oF.

There is an earlier threat in Chemical Engineering about this tropic. Try searching for it.

 

[Scipio]

I don't know if that chart is available separately, but the text I have it in is GPSA's Engineering Data Book, Volume II, in Section 20 (Dehydration). It might be in a different section now, however, as I'm still using the 10th edition, and I believe they're on the 11th edition now, if not the 12th.

 

[cpwrocky]

Thanks for your help guys. This is really a great means of sharing knowledge.