Abstract-This paper presents a propane precooled mixed refrigerant (C 3 -MR) liquefaction plant with 3 pressure levels of propane cooling that is planned to be build in Timor-Leste and the simulation of refrigeration system for C 3 -MR process that is to predict liquefied natural gas (LNG) specific horse power of the system. By varying the natural gas temperature between 10 and 50 o C and pressure between 20 and 60 bar respectively, the effect of natural gas temperature and pressure on specific horse power for the C 3 -MR was determined. The result of simulation indicates that the specific horse power for the C 3 -MR process depends on natural gas supply temperature and pressure. The increase of temperature from 30 o C to 50 o C results in 0.83% increase in specific horse power and the decrease of temperature from 30 to 10 o C results in 0.82% decrease in specific horse power. The pressure increase from 40 to 60 bar results in 0.37% decrease in specific horse power and decrease from 40 to 20 bar results in 0.39% increase in specific horse power. In addition that, the production capacity per train increase by 4.78% when natural gas pressure supplied from 40 to 60 bar and 7.22% decrease when pressure decrease from 40 to 20 bar.
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