Oil Industries’ Commissioning and Operation Company (OICO) is incorporated to manage and execute commissioning and start-up, operation, maintenance and professional training for oil, gas and petrochemical industries. OICO was established in 2011 as a private joint stock company in Tehran, Iran; which is a subsidiary of Oil Industries Engineering and construction group (OIEC group). As a commissioning and start-up pioneer, OICO successfully commissioned mega projects such as South Pars Gas Field Development Phased 9&10 (Feed: 2000MMCFD) and Sirri NGL (Feed: 140MMCFD). Currently, OICO is involved in South Pars Gas Field Development Phases 12 (Feed: 3000MMCFD), 17&18 (Feed: 3000MMCFD) and 20&21 (Feed: 3000MMCFD). OICO is considered as the first private company which has operated a plant (Sirri NGL) in Iran.