McKetta-Wehe · GPSA · Pipeline Dehydration Specs
Pipeline tariffs typically require <7 lb/MMSCF or a water dewpoint of 32°F. Cryogenic plants need <1 ppmv (<0.1 lb/MMSCF). Arctic pipelines may require -40°F dewpoint.
Water content prediction, dewpoint specs, dehydration method comparison, hydrate prevention through dewatering
Evaluates gas dewatering requirements using McKetta-Wehe water content correlation and GPSA dehydration method selection guidelines.
| Method | Dewpoint | Cost |
|---|---|---|
| TEG Glycol | -40 to 32°F | Low-Med |
| DEG Glycol | 0 to 40°F | Low |
| Mol. Sieve | -150 to -60°F | High |
| Refrigeration | 15 to 40°F | Med-High |
| CaCl2 | 30 to 50°F | Very Low |
Water content in natural gas is determined by temperature and pressure. Higher temperatures increase water carrying capacity while higher pressures reduce it. The McKetta-Wehe chart is the industry-standard method for sweet gas; acid gas correction factors are applied for CO2 and H2S content per GPSA.
Gas dewatering is the primary method for preventing hydrate formation. Reducing water content below the saturation point at the coldest expected pipeline temperature eliminates free water and prevents hydrate nucleation. For gathering systems, target a dewpoint 15-20°F below the minimum ground temperature.
It determines water content, removal rates, and recommends dehydration methods for meeting pipeline specifications using the McKetta-Wehe correlation.
The calculator uses the McKetta-Wehe correlation to determine water content in natural gas at given temperature and pressure conditions.
Yes, this is a free gas dewatering calculator with instant results for pipeline dehydration requirements.
The McKetta-Wehe correlation calculates the water content of natural gas at specified temperature and pressure conditions. It includes corrections for acid gas content (CO2 and H2S) and gas specific gravity to determine inlet water loading in lb/MMSCF.
Pipeline tariffs typically require less than 7 lb/MMSCF water content or a water dewpoint of 32°F. Cryogenic plant feeds need less than 0.1 lb/MMSCF (less than 1 ppmv), and Arctic pipelines may require -40°F dewpoint.
The calculator compares the required dewpoint depression against each method's capability: TEG glycol handles 30-80°F depression, molecular sieve exceeds 100°F, refrigeration achieves 20-60°F, and CaCl2 provides 15-30°F depression. It selects the most cost-effective option for the required outlet specification.
CO2 and H2S increase the water content of natural gas compared to sweet gas at the same conditions. The McKetta-Wehe correlation applies correction factors for acid gas content to accurately predict water loading for sour gas streams.