Chapter 6A

6A.Water Content of Sweet, Lean Natural Gases Back to Main

This screen is used to determine the water content of lean, sweet natural gas using the Water Content of Sweet, Lean natural Gas graph (Figure 6.1) and (Figure 6.1a).

Until the early 1950’s most of the commercial natural gas had been processed in NGL units for its heavier components and most of its contaminants. For this lean, sweet natural gas the log of water content (W) was plotted versus P and T. It was found that a plot of log W versus 1/T approximated a straight line at a given pressure: most plots use log W versus T.

##### How do I carry out this calculation?

To calculate the water content of sweet, lean natural gas the temperature and pressure must be entered into their entry spaces. To do so use the mouse to click the cursor in the entry spaces and input the data. Once this has been done, select Run to execute the solution.

The water content shown is the maximum amount of water the gas can hold at the specified P and T.

##### Definitions of the variables and where to obtain the unknown data

A sweet gas may contain an small amount of contaminants such as CO2 and H2S.

Pressure is the force exerted per unit area of the gas. For engineering purposes absolute pressure is used. In English units we add an "a" to indicate absolute pressure (psia, psfa); "g" is added to gauge pressure (psig, psfg). In SI metric no suffix will be used for absolute pressure.

Temperature is the temperature of the gas in SI units, Celsius and Kelvin or in English units, Fahrenheit and Rankin.

° C = 0.556 (° F - 32), K = ° C + 273, ° F = (1.8)(° C) + 32, ° R = ° F + 460

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