Fokus pada penelitian ini adalah melakukan kajian tekno-ekonomi sistem purifikasi minyaktransformer untuk industri migas lepas pantai. Tantangan yang dihadapi adalah merancangsebuah desain sistem purifikasi yang cocok untuk area operasi yang terbatas, tidakmengganggu operasi (secara online), dan dilakukan tanpa keluar dari pipa / sistemtransformer sesuai dengan regulasi yang berlaku (closed loop). Metodologi yang digunakanpada penelitian ini adalah menggunakan studi literatur penelitian-penelitian sebelumnya,penelusuran pasar, dan data kontrak yang berlaku di industri migas Indonesia. Kajiandiawali dengan melakukan review metode purifikasi yang dapat dilakukan secara onlinedan closed loop terhadap lima (5) metode antara lain: sedimentasi alami, filtrasi, adsorpsi,degassing & dehydration¸dan penambahan zat aditif. Metode-metode purifikasi yangmemenuhi syarat online dan closed loop (yaitu filtrasi, adsorpsi, dan degassing &dehydration) kemudian dikombinasikan menjadi tiga (3) sistem purifikasi dan dievaluasikesesuaiannya terhadap kontaminan. Penelitian ini menyimpulkan bahwa sistem purifikasiyang cocok untuk industri hulu migas lepas pantai Indonesia adalah kombinasi metodefiltrasi (pre-filter dan filter primer) – degassing & dehydration – filtrasi sekunder denganflow rate 10 liter per menit. Sistem yang paling sesuai adalah yang terdiri dari proses prefilterdan filtrasi primer yang memiliki kemampuan penyaringan partikel hinnga 50 mikrondan penurunan tekanan 0,01 MPa, dilanjutkan proses degassing & dehydration beroperasipada tekanan vakum -0,08 MPa gauge dan suhu 65 0C, dan diakhiri dengan filtrasi sekunderdengan spesifikasi filter sama dengan filtrasi pertama. Investasi sistem purifikasi ini cukupmurah dan ekonomis dengan biaya kapital Rp107.305.658,50, nilai IRR 43,33%, NPVRp340.315.914,00, dan payback period selama 2,47 tahun.

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The focus of this research is to conduct techno-economic analysis for investment on

purification system of transformer oil in offshore oil and gas industry. The challenges of the

purification system are the design shall be appropriate for limited space area, no production

disruption (works online), and conducted without discharging from the pipe / transformer

system in accordance with regulations (closed loop). The methodology of this research is

conducting literature study and review to previous researches, market assessment, and

existing contract data which applied in oil & gas industri of Indonesia. The study begins

with a review to purification methods which can be conducted online and closed looply into

five (5) methods which are: natural sedimentation, filtration, adsorption, degassing &

dehydration¸ and the additives. Purification methods that meet the online and closed loop

requirements (which are filtration, adsorption, and degassing & dehydration) are then

combined into three (3) purification systems and evaluated for their contaminant suitability.

This research conclude that the most appropriate purification system is the combination of

filtration (pre-filter & primary filter) – degassing & dehydration – filtration methods with

flow rate 10 liters per minute. The most appropriate system is consisting of pre-filter and

primary filtration process which can filter the partikel up to 50 microns with drop pressure

0.01 MPa, followed by degassing & dehydration process which operated at pressure -0.08

MPa gauge and temperature 65 0C, and finalized by secondary filtration process with the

same specification with primary filter. The purification system investment is quite cheap

and economical with capital expenditure Rp107.305.658,50, IRR value 43,33%, NPV

Rp340.315.914,00, and payback period 2,47 years.