Hydrate Inhibitor (Hammerschmidt) Calculator

Determine required weight percentage and daily volumetric injection rate of Monoethylene Glycol (MEG) or Methanol to prevent gas hydrate blockages.

Subcooling & Water Production

Inhibitor Chemical Type:

Required Temperature Depression ΔT (°F): ΔT = Hydrate Formation Temp - Lowest Operating Temp + 5°F safety

Produced Free Water Rate (bpd):

Gas Flow Rate (MMSCFD):

Lean Supply Concentration (wt %): Standard lean MEG: 80% - 90% wt

Gas Phase Vapor Loss Allowance (lb/MMSCF): MEG ~ 5-15 lb, MeOH ~ 50-120 lb

Inhibitor Dosage Results

Required Rich Concentration (X_rich):

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Daily Lean Injection Volume:

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Pure Inhibitor Mass Rate:

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Injection Pump Rate:

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Gas Vapor Loss Total:

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Water-Phase Dilution Ratio:

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Thermodynamic Hydrate Inhibition (THI)

Thermodynamic inhibitors lower the chemical potential of water through hydrogen bonding, shifting the hydrate equilibrium curve to lower temperatures and higher pressures (freezing point depression). Monoethylene Glycol (MEG) and Methanol are the two dominant chemicals injected into subsea Christmas trees and flowlines.

Hammerschmidt Equation (1934)

ΔT = (2330 · X) / [MW · (100 - X)]

Where $Delta T$ is hydrate temperature depression in °F, $X$ is inhibitor concentration in weight percent of the aqueous phase, and $MW$ is molecular weight ($62.07 ext{ g/mol}$ for MEG, $32.04 ext{ g/mol}$ for Methanol).

Hydrate Inhibitor (Hammerschmidt) Calculator

Subcooling & Water Production

Inhibitor Dosage Results

Thermodynamic Hydrate Inhibition (THI)

Hammerschmidt Equation (1934)

Frequently Asked Questions