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Dehy Utilities Calculator

Glycol Loss · Flash Tank · Heat Exchanger

Glycol Dehydration Utility Calculators
Three essential tools for glycol system design and troubleshooting: estimate glycol losses, size flash separation tanks, and calculate glycol/glycol heat exchanger duty.

Select Calculation Type

Operating Conditions

MMscfd
°F
psig

System Configuration

gal/hr
SCF/gal
TEG Loss Mechanisms

Vaporization: 0.01-0.05 gal/MMscf (temperature dependent)
Mist Carryover: 0.02-0.10 gal/MMscf (demister dependent)
Thermal Degradation: 1-3% per year at proper temps

Glycol Flow & Conditions

gal/hr
°F

Operating Pressures

psig
psig
minutes
Flash Tank Design

Typical pressure: 50-75 psig (optimize for hydrocarbon recovery)
Residence time: 10-20 minutes for adequate separation
Purpose: Remove dissolved gas and light hydrocarbons before regeneration

Hot Side (Lean Glycol)

gal/hr
°F
°F

Cold Side (Rich Glycol)

gal/hr
°F
wt%
/* Glycol/Glycol Heat Exchanger */
Q = m × Cp × ΔT
// Q = BTU/hr, m = lb/hr, Cp = 0.53 BTU/lb·°F (TEG)

About This Calculator

Three utility calculations for glycol dehydration system design and troubleshooting.

Included Calculations:

  • Glycol Loss: Vaporization + mist carryover + degradation
  • Flash Tank: Volume sizing for residence time
  • Heat Exchanger: Glycol/glycol duty calculation

References

  • GPSA
  • Keel, L. "Glycol Dehydrators" Texas Gas (2004)
  • API 12GDU Glycol Dehydration Units