Program Studi Teknologi Rekayasa Mekatronika 2026
Mahasiswa : Henrikus Teddy Widiatmanto, Stefano Galan Adisurya
Pembimbing : Sylvia Hadiani W., S.T., M.T.
ABSTRAK/ABSTRACT
Sistem metering minyak memiliki peran penting dalam industri oil & gas, khususnya dalam memastikan akurasi dan repeatability pada proses custody transfer. Pada salah satu perusahaan industri oil & gas di Kalimantan, dilakukan pembaruan sistem metering dengan tujuan utama meningkatkan kualitas pengukuran. Sistem metering yang baru mengintegrasikan flowmeter Coriolis, pressure transmitter Cerabar, dan temperature transmitter berbasis flow computer ISOIL Vega 3. Pembaruan dilakukan untuk menggantikan sistem lama yang menggunakan turbine flowmeter dan flow computer AccuLoad III, yang dinilai kurang optimal dalam pengukuran produk. Sistem baru dirancang dengan konfigurasi multi-stream, memungkinkan pengukuran fluida secara real-time melalui tiga jalur pengukuran (ARM 1, ARM 2, ARM 3). Setiap stream dilengkapi instrumen utama dan pendukung, serta terhubung ke flow computer yang mampu melakukan kompensasi temperatur dan tekanan sesuai standar API dan OIML. Hasil pengujian menunjukkan peningkatan signifikan pada akurasi pengukuran, dengan persentase kesalahan turun dari 0,17% pada sistem lama menjadi 0,03% pada sistem baru.
Kata Kunci : Sistem Metering, Custody Transfer, Flowcom, Flowmeter,
The oil metering system plays a vital role in the oil and gas industry, particularly in ensuring measurement accuracy and repeatability during custody transfer processes. At an oil and gas company in Kalimantan, an upgrade of the metering system was carried out with the primary objective of improving measurement quality. The new metering system integrates a Coriolis flowmeter, Cerabar pressure transmitter, and temperature transmitter with an ISOIL Vega 3 flow computer. This upgrade replaced the previous system, which utilized a turbine flowmeter and an AccuLoad III flow computer, as it was considered less effective in product measurement. The new system was designed with a multi-stream configuration, enabling real-time fluid measurement through three measurement lines (ARM 1, ARM 2, and ARM 3). Each stream is equipped with primary and supporting instruments and is connected to a flow computer capable of performing temperature and pressure compensation in accordance with API and OIML standards. The test results demonstrated a significant improvement in measurement accuracy, with the measurement error decreasing from 0.17% in the previous system to 0.03% in the upgraded system.
Keywords : Metering System, Custody Transfer, Flow Computer, Flowmeter,
DAFTAR PUSTAKA
Sunayana Gadepatil, “Custody Transfer Explained: 7 Powerful Insights Every Engineer Should Know,” Instrumentation Blogs !!, Nov. 20,
https://www.instrumentationblog.in/what-is-custody-transfer/ (accessed Apr. 15, 2026).
Bandicoot, “LACT & Custody Transfer 101: Measurement, Proving & API Compliance – PLC Construction,” PLC Construction, Dec. 29, 2025. https://www.plcconstruction.com/lact-custody-transfer-101-measurement- proving-api-compliance/ (accessed Apr. 21, 2026).
Organisation Internationale de Métrologie Légale, “OIML R 117-1 RECOMMENDATION Edition 2007 (E) Dynamic measuring systems for liquids other than water Part 1: Metrological and technical requirements,” May 2019. Available: https://www.oiml.org/en/files/pdf_r/r117-1-e07.pdf
Sudha M, “Gas Metering System: Working Principle, Components, Custody Transfer & Standards,” Instrumentation and Control Engineering, Mar. 31, 2023. https://automationforum.co/what-is-gas-metering-system/ (accessed Apr. 16, 2026).
A. Measurement, “Application note – High accuracy Coriolis meters for trusted custody transfer,” Abb.com, 2026. https://search.abb.com/library/Download.aspx?DocumentID=AN%2FPA MA%2FHIGH_ACCURACY_CORIOLIS_METERS_FOR_TRUSTED_ CUSTODY_TRANSFER (accessed Apr. 21, 2026).
E. Dupuis, “Petroleum Africa,” 2014. Available: https://www.emerson.com/documents/automation/article-oil-gas-custody- transfer-en-us-42184.pdf 73 74
M. Calculator, “Meter Proving Fundamentals | API MPMS Chapter 4 Guide,” MidstreamCalculator, 2025. https://midstreamcalculator.com/engineering/pipeline-ops/meter-proving- fundamentals.html (accessed Apr. 27, 2026).
E. Hauser, “IFLOWX,” Endress.com, 2018. https://www.mesc.endress.com/en/field-instruments-overview/flow- measurement-product-overview/flow-x?t.tabId=product-overview (accessed Apr. 27, 2026).
Stocexpo, “VEGA 3 Multi-streams Modular Flow Computer,” StocExpo, 2026. https://www.stocexpo.com/en/products/vega-3-multi- streams-modular-flow-computer-141729/ (accessed May 03, 2026).
ISOIL, “Metrological characteristics,” Dec. 2018.
ISOIL, “VEGA 3 INSTALLATION MANUAL,” Jan. 2020.
Jack, “How to Calculate Volume Correction Factor (VCF) | Complete Step-by-Step Guide – studyexamscore.com,” studyexamscore.com, Feb. 07, 2026. https://studyexamscore.com/how-to- calculate-volume-correction-factor-vcf-complete-step-by-step-guide/ (accessed Jun. 15, 2026).
KELTON, “C012 – API/Table 54 Density Referral,” Kelton.co.uk,
https://help.kelton.co.uk/c012-api-table-54-density-referral/ (accessed May 03, 2026).
Manaru, “Sensor dan Transmitter dalam Dunia Instrumentasi : Peran, Prinsip Kerja, dan Aplikasi di Berbagai Industri,” Manaru, Feb.
https://www.manaru.id/sensor-dan-transmitter-dalam-dunia- instrumentasi (accessed Jun. 13, 2026).
Flowtechnik, “How Coriolis Flowmeters Work – A Detailed Engineering Explanation | UK Flowtechnik Ltd,” Ukflowtechnik.com, 2026. 75 https://www.ukflowtechnik.com/how-coriolis-flowmeters-work-detailed- engineering-explanation (accessed May 11, 2026).
E. Hauser, “Metric RTD/TC thermometer with welded thermowell for a wide range of industrial applications,” May 2025.
E. Hauser, “Temperature measurement with Resistance Temperature Detectors (RTD),” Youtu.be, 2026. https://youtu.be/yQvRqtozC6g?si=Js2YUT90PRp0-_tj (accessed Jun. 13, 2026).
Wika Group, “How do diaphragm seals work? | Areas of application and advantages in pressure measurement,” Youtu.be, 2026. https://youtu.be/5ScB2nEcfOs?si=KIvJPKCdvkOrgvL4 (accessed Jun. 14, 2026).
E. Hauser, “Digital pressure transmitter with metallic process membrane,” Aug. 2025.
Isaac, “Apa itu Modbus: operasi, jenis, bingkai, dan kegunaan,” Hardware libre, Aug. 21, 2025. https://id.hwlibre.com/apa-itu-modbus/ (accessed Jun. 14, 2026).
Y. Sapra, “RS485 Modbus Master–Slave Communication Technical Guide,” IoTStudioz, Dec. 29, 2025. https://iotstudioz.com/master-slave- communication-in-rs-485-modbus-gateways-an-in-depth-technical-guide/ (accessed Jun. 14, 2026).
ModbusCloud, “Modbus TCP explained: a guide for installers (2026),” Modbuscloud.com, May 25, 2026. https://www.modbuscloud.com/knowledge-base/modbus-tcp-explained (accessed Jun. 14, 2026). 76
Oncom, “apa itu HART Communication ? – Rifqi-Oncom,” Rifqion.com, Jan. 21, 2011. https://www.rifqion.com/menulis/apa-itu-hart- communication/ (accessed Jun. 14, 2026).
RAP Systems, “INTELLIGENT HART GATEWAY PLUS (HG1+) USER GUIDE Revision 4.0 WWW.INFOPULSAS.LT / sales@infopulsas.lt,” Feb. 2023.
Harvianti, A. A. (2025, January 8). Mengenal biodiesel b40: manfaat, harga, dan kelebihannya. Solar Industri. https://solarindustri.com/blog/biodiesel-b40/
P. I. SpA, “Batch Controllers: ISOIL VEGA 3 – the Ideal Solution for Petroleum Terminals,” Isoilmeter.it. Accessed: Aug. 06, 2026. [Online]. Available: https://www.isoilmeter.it/en/news/batch-controllers-isoil-vega- 3-the-ideal-solution-for-petroleum-terminals