Commissioning Supervisor - Mechanical

Commissioning Supervisor – Mechanical Project: INEOS Project ONE Location: Antwerp, Belgium Industry: Petrochemical / Ethylene / Olefins Project Phase: Commissioning & Start-Up Start: 1 November 2026 Duration: Approx. 12 months Contract: Freelance or Payroll Eligibility: EU-based / EU work eligibility required due to mobilisation timeline Housing & Transport: Provided The Project We are looking for an experienced Commissioning Supervisor – Mechanical to support the commissioning and start-up of INEOS Project ONE in Antwerp. Project ONE is a major greenfield petrochemical development centred around a new ethane steam cracker , designed to produce approximately 1.45 million tonnes of ethylene per year . The project is progressing from construction and mechanical completion into system handover, pre-commissioning, commissioning and ultimately start-up of the complete plant. Commissioning Supervisor – Mechanical As a Mechanical Commissioning & Start-Up Supervisor , you will support the commissioning and start-up of INEOS Project ONE, with field responsibility for assigned mechanical systems and equipment. You will supervise mechanical systems from Mechanical Completion through pre-commissioning, commissioning, start-up and final handover to Operations . Depending on project requirements, your scope may cover a specific area or extend across the entire plant . You will work closely with Construction, Operations, Engineering, Process, E&I and other commissioning disciplines to ensure that mechanical systems and equipment are technically ready for safe operation. This is a hands-on field role with a strong focus on system readiness, mechanical integrity, start-up support, troubleshooting and safe plant operation. Main Responsibilities Supervise mechanical systems and equipment from Mechanical Completion through pre-commissioning, commissioning, start-up and handover to Operations Coordinate and perform mechanical system walkdowns, equipment checks, punch-list follow-up and verification of system readiness Review mechanical completion documentation, system boundaries, test packs and commissioning dossiers Coordinate and supervise mechanical pre-commissioning activities, including flushing, cleaning, pressure testing, leak testing, reinstatement and system preparation Support commissioning and start-up of mechanical equipment, systems and utilities Ensure mechanical equipment is correctly prepared and available for initial operation and plant start-up Work closely with Operations and other disciplines during equipment start-up, initial operation, troubleshooting and plant stabilisation Coordinate with Construction and Engineering regarding outstanding mechanical issues, punch items and technical queries Supervise contractors and field personnel during commissioning and start-up activities Ensure safe execution in accordance with HSE, Permit-to-Work, LOTO and SIMOPS requirements Maintain accurate commissioning records, punch lists, system status and handover documentation Support the progressive handover of completed systems from Construction/Commissioning to Operations Where required, take responsibility for mechanical commissioning and start-up activities across multiple plant areas or the complete facility

Extensive hands-on Mechanical Commissioning & Start-Up experience within petrochemical, ethylene/olefins, refinery, Oil & Gas or comparable process facilities Demonstrable experience taking mechanical systems and equipment from Mechanical Completion through commissioning and actual plant start-up to Operations handover Strong practical knowledge of mechanical systems, rotating and static equipment, piping systems, valves and associated plant equipment Strong understanding of mechanical completion, system boundaries, walkdowns, punch listing, test packs and commissioning procedures Proven experience supporting or supervising actual plant start-ups , preferably on large-scale greenfield projects Ability to work across multiple disciplines and coordinate effectively with Construction, Operations, Engineering, Process and E&I teams Strong field leadership and contractor coordination skills Good knowledge of HSE, Permit-to-Work, LOTO and SIMOPS requirements Experience with major petrochemical projects, steam crackers or ethylene/olefins plants is a strong advantage Good command of English EU work eligibility and availability to mobilise to Antwerp by 1 November 2026