Calculate natural gas water content for dehydration and hydrate analysis, per GPSA 20.
Sweet natural gas: 0.55-0.70
Rich/wet gas: 0.70-0.85
| Pipeline | ≤ 7 lb/MMscf |
| Sales gas | ≤ 4 lb/MMscf |
| Cryogenic | ≤ 1 lb/MMscf |
Detailed coverage of gas water content, McKetta-Wehe charts, GPSA correlations, and dehydration requirements.
This calculator uses the McKetta-Wehe correlation and GPSA Section 20 methods to determine the saturated water content of natural gas at a given temperature and pressure. Results are expressed in lb water per MMscf of gas.
The McKetta-Wehe chart provides equilibrium water vapor content of sweet natural gas as a function of temperature and pressure. It is the industry-standard reference published in the GPSA Engineering Data Book, Section 20.
Yes — sour gases (H₂S and CO₂) increase the water-carrying capacity of natural gas. Note this calculator is for SWEET gas only (it applies a gas-gravity correction but no acid-gas correction); for sour service, apply CO₂/H₂S corrections separately per GPSA Section 20.
Knowing the water content is essential for sizing dehydration equipment such as glycol contactors and molecular sieve beds. Excess water causes hydrate formation, corrosion, and failure to meet pipeline sales gas specifications.