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TEG Dewpoint Calculator

GPSA Figure 20-63 · McKetta-Wehe Charts

TEG Equilibrium Dewpoint Calculator
Determines achievable water dewpoint using triethylene glycol dehydration based on GPSA Figure 20-63 equilibrium data. Calculates outlet water content using McKetta-Wehe charts per GPSA Figure 20-3.

Contactor Operating Conditions

°F
psia
Typical Ranges:
Contact temp: 80-120°F optimal
Pressure: 300-1500 psia typical

TEG Properties

wt%
Regeneration Requirements:
95-98.7%: Atmospheric reboiler
98.5-99.2%: Stripping gas (1-5 scf/gal)
99.0-99.5%: DRIZO® or vacuum

About This Calculator

Uses GPSA equilibrium data to predict achievable water dewpoint based on lean TEG concentration and contactor temperature. Water content calculated from McKetta-Wehe charts.

Pipeline Specification:
7 lb H₂O/MMscf maximum (typical US)
4 lb H₂O/MMscf (cold climate/subsea)

📚 Learn the Theory

TEG dehydration process flow, GPSA design methods, McKetta-Wehe charts, glycol regeneration, and contactor sizing.

Read Engineering Guide →

⚡ Quick Reference — TEG Dehydration

Pipeline Spec: ≤7 lb/MMscf
Lean TEG: 98.5-99.5 wt%
Circulation: 3-5 gal/lb H₂O
Reboiler Temp: 380-400°F
Degradation: >404°F
Trays: 4-8 typical

Key Relationships

// Dewpoint Depression
ΔTdp = Tcontact - Tdewpoint

// Water Content (McKetta-Wehe)
W = f(Tdewpoint, Poperating)

Higher TEG concentration → Lower equilibrium dewpoint → Lower water content

References

  • GPSA, Section 20
  • GPSA Figure 20-63: TEG Equilibrium Dewpoint
  • McKetta & Wehe (1958): Water Content Charts
  • Campbell Gas Conditioning, Vol. 2

About This Calculator

Calculates equilibrium water dewpoint achievable with TEG dehydration using industry-standard GPSA data.

Methodology:

  • Equilibrium Data: GPSA Figure 20-63
  • Water Content: McKetta-Wehe charts
  • Approach Temp: +5-15°F adjustment
  • Pipeline Spec: 7 lb H₂O/MMscf

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