Carry out planned and reactive maintenance, overhaul, and repair of industrial valves, pipework, flanges, and associated mechanical equipment across the refinery site. * Dismantle, inspect, recondition, reassemble, and test valves and mechanical components in accordance with engineering specifications, company quality procedures, and applicable industry standards. * Install new valve and pipework assemblies, including flanged and bolted connections, gasket replacement, and torque tightening to specification. * Carry out pressure testing of valves and pipework systems following overhaul or installation, in line with relevant test procedures and safety requirements. * Work from and interpret engineering drawings, P&IDs, isometric sketches, and work packs to carry out mechanical tasks accurately and safely. * Operate within the site's Permit to Work (PTW) system at all times, ensuring all isolations, risk assessments, and method statements are in place before commencing work. * Carry out mechanical isolations and reinstatement of equipment in accordance with site isolation procedures and engineering standards. * Participate in planned shutdown and turnaround activities on site, working to programme timescales and supporting the wider project and client team to deliver on time. * Complete all relevant job documentation accurately and in a timely manner, including job cards, inspection records, test certificates, and time sheets. * Maintain a clean, safe, and organised work area at all times, adhering to site HSE requirements, company quality management procedures, and all applicable regulations. * Liaise effectively with client engineers, supervisors, and other contractors on site to ensure safe and efficient delivery of all work activities. * Support and mentor less experienced team members as required