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Terminal Processing Area (TPA) at Senipah Terminal consists of 2 trains in which each train is receive and process Handil Mix Crude (HMC) and Bekapai Crude Oil (BCO). A fired heater (H-850) was built in 1976 and installed in Handil Train of Terminal Processing Area (TPA). It consists of 6 burners and operated using fuel gas. Initially, it was used to increase the Handil Crude Oil (HCO) temperature in order to prevent wax formation during storage and shipment. After more than 30 years in service, there are changes in operating mode/ condition, equipment performances and its integrity. To perform the fired heater preservation, a systematical engineering study has been conducted which covers a review on impact to process and operating condition, integrity issue, safety and environmental aspect. The study recommendation had been implemented. The fired heater had been preserved and will be operated only during the major planned shutdown of Condensate Stabilization Unit (CSU) at Senipah Terminal which occurs once every 4 years with the duration of 14 days. With this operating mode, the expected energy efficiency in terms of fuel gas saving is 136 MMscf/ year (equal to 1.1 MMUSD/year, assuming gas price of 8,000 USD/MMscf, oil price of 100 USD/Bbl). It also reduces the produced NO2 emission by 65 ton/year. This initiative shows TEPI commitment to operate at optimum resource while maintaining safety and environment commitment.