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Predictions are presented from a field model for offshore compartment jet fires. The Constrained equilibrium method has been used to couple the calculation of combustion and Radiative heat exchange. Soot formation is modeled by a one-equation approach. Radiation is computed with the Discrete Transfer Radiation Method (DTRM) and a published procedure for calculating the Planck mean emission and absorption coefficients of gas-soot mixtures is used to calculate the radiation properties. Comparisons are made with full-scale jet fire tests in a 135 m3 ventilation-controlled compartment. It is found that the model predicts the correct trend of field variables such as velocity, temperature, CO, CO2 and OH. Soot predictions also show a reasonable distribution. For the two vertical lines within the compartment and at the vent where temperature measurements are available, the predictions are also in reasonably good agreement with the experimental data.