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Water Content Calculator

McKetta-Wehe Correlation

Gas Conditions

Temperature

°F

Pressure

psia

Gas Properties

Gas Gravity (Air=1.0)

-

Typical range: 0.55-0.70 for natural gas

Dehydration Target

Pipeline spec: typically 7 lb/MMscf
LNG/cryogenic: < 1 ppm
Sales gas: 4-7 lb/MMscf

Formula

W = (W_sat × P_sat) / P

W = Water content (lb/MMscf)

W_sat = Saturated water content

P = System pressure (psia)

Standards & References

GPSA Engineering Data Book
McKetta-Wehe Charts
GPA 2145
Water Content of Natural Gas
ISO 18453
Natural Gas - Correlation Water Content

Important Notes

McKetta-Wehe assumes sweet gas - acid gases increase water content
Pipeline spec typically 7 lb/MMscf to prevent hydrates/corrosion
Glycol/molecular sieve dehydration achieves < 1 lb/MMscf
Water content increases with temperature, decreases with pressure