Studi Sistem Control Temperature Methanator Feed Preheat pada Plant Amonia 1B di PT Petrokimia Gresik

Asrori, Nur Dia (2026) Studi Sistem Control Temperature Methanator Feed Preheat pada Plant Amonia 1B di PT Petrokimia Gresik. Project Report. [s.n.]. (Unpublished)

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Abstract

Methanator merupakan salah satu unit penting dalam proses produksi amonia yang berfungsi untuk menghilangkan sisa karbon monoksida (CO) dan karbon dioksida (CO₂) dari gas proses melalui reaksi metanasi menggunakan katalis. Reaksi ini bersifat eksotermis sehingga menghasilkan panas yang dapat memengaruhi kestabilan temperatur pada sistem proses. Oleh karena itu, diperlukan sistem pengendalian temperatur yang baik agar kondisi operasi tetap stabil serta mencegah kerusakan katalis akibat temperatur yang terlalu tinggi. Pada Plant Amonia 1B di PT Petrokimia Gresik, sebelum gas proses memasuki reaktor methanator, gas terlebih dahulu dipanaskan melalui sistem *Methanator Feed Preheat*. Pengendalian temperatur pada sistem ini menggunakan metode *split-range control* dengan TIC-1012 sebagai *controller* utama yang mengatur dua *control valve*, yaitu TV-1012B untuk aliran *high-pressure steam* dan TV-1012A sebagai *bypass*. Selain itu, TIC-1392 berfungsi sebagai *override controller* pada kondisi batas operasi. Hasil evaluasi data historis DCS menunjukkan bahwa sistem mampu menjaga temperatur inlet methanator pada *set point* 285°C dengan penyimpangan yang kecil dan kondisi operasi yang stabil. TIC-1392 juga tidak aktif selama periode pengamatan karena kondisi operasi masih berada dalam batas aman. Penulisan laporan ini dilakukan melalui metode studi literatur serta pengumpulan data dari dokumen teknis dan sistem operasi selama pelaksanaan magang. Studi ini diharapkan dapat memberikan pemahaman mengenai penerapan sistem kontrol temperatur pada unit *Methanator Feed Preheat* di Plant Amonia 1B PT Petrokimia Gresik.
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The methanator is a critical unit in the ammonia production process that removes residual carbon monoxide (CO) and carbon dioxide (CO₂) from the process gas through a catalytic methanation reaction. This reaction is exothermic and generates heat that may affect the temperature stability of the process system. Therefore, an effective temperature control system is required to maintain stable operating conditions and prevent catalyst damage caused by excessive temperatures. At Ammonia Plant 1B of PT Petrokimia Gresik, the process gas is first heated in the *Methanator Feed Preheat* system before entering the methanator reactor. The temperature control system employs a *split-range control* strategy with TIC-1012 as the primary controller, regulating two control valves: TV-1012B for high-pressure steam flow and TV-1012A as the bypass valve. In addition, TIC-1392 serves as an override controller under operating limit conditions. The evaluation of historical Distributed Control System (DCS) data indicates that the control system successfully maintained the methanator inlet temperature at the 285°C set point with minimal deviation and stable operating conditions. Furthermore, TIC-1392 remained inactive throughout the observation period because the operating conditions stayed within safe limits. This report was prepared through a literature review and data collection from technical documents and plant operating systems during the internship program. This study is expected to provide a better understanding of the implementation of the temperature control system in the *Methanator Feed Preheat* unit at Ammonia Plant 1B of PT Petrokimia Gresik.

Item Type:	Monograph (Project Report)
Uncontrolled Keywords:	Methanator, Pengendalian Temperatur, Split range control, TIC 1012, TIC-1392. Methanator, Temperature Control, Split-range control, TIC 1012, TIC-1392.
Subjects:	Q Science > QC Physics > QC271 Temperature measurements
Divisions:	Faculty of Vocational > Instrumentation Engineering
Depositing User:	Nur Dia Asrori
Date Deposited:	29 Jul 2026 07:03
Last Modified:	29 Jul 2026 07:03
URI:	http://repository.its.ac.id/id/eprint/138752

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