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Hydrate Temperature Calculator

Motiee (1991) Correlation per GPSA Data Book

Hydrate Formation Temperature Prediction
Uses Motiee (1991) correlation for accurate hydrate formation temperature estimation. Valid for sweet natural gas (SG 0.55-0.90) at pressures up to 4000 psia. Accuracy: ±2-3°F.

Gas Properties

psig
Air=1.0
°F

Hydrate Formation Conditions

Three requirements:
1. Free water present
2. Temperature below Thyd
3. Pressure above Phyd

Typical Thyd at 1000 psia:
SG 0.6: ~62°F | SG 0.7: ~66°F | SG 0.8: ~71°F

Prevention Methods

Thermodynamic:
• Methanol (10-30 wt%)
• MEG/DEG glycol injection
• Gas dehydration (<7 lb/MMscf)
Mechanical:
• Line heating/insulation
• Pressure reduction

📚 Learn the Theory

Complete coverage of hydrate formation temperature, P-T curve prediction, and inhibition strategies.

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Motiee (1991) Correlation

T = A₀ + A₁·log(P) + A₂·log²(P) + B₁·γ + B₂·γ² + C₁·γ·log(P)
T = Hydrate temperature (°C)
P = Pressure (kPa)
γ = Gas specific gravity
Ref: Hydrocarbon Processing, 70:98-99

Standards & References

  • GPSA
    Gas Hydrate Formation Charts
  • GPA 2145
    Predicting Hydrate Formation Conditions
  • CSMGem / Multiflash
    Advanced hydrate prediction software

Important Notes

  • Motiee correlation valid for sweet natural gas (SG 0.55-0.90)
  • Requires free water present - dry gas (<7 lb H₂O/MMscf) won't form hydrates
  • CO₂/H₂S >10% shifts Thyd upward - use CSMGem for sour gas
  • Design margin: operate ≥10-20°F above Thyd
  • Correlation accuracy: ±2-3°F for typical natural gas

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