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