Oscar A. Gonzalez Jr.
Dubai
Summary
Mechanical and Commissioning Specialist with over 20 years of experience in the oil and gas, LNG, refinery, and power sectors across diverse regions including the UAE, Kazakhstan, Qatar, and Nigeria. Proven expertise in pre-commissioning, commissioning, shutdowns and turnarounds, valve automation, and rotating equipment maintenance. Extensive background in executing major shutdowns and turnaround activities for valves and pumps as a vendor for industry leaders such as Emerson, Rotork, Siemens, and Flowserve, including testing, refurbishment, calibration, and functional verification. Strong leadership skills in managing multinational teams to deliver large-scale commissioning projects involving pumps, compressors, pressure vessels, automated valves, and safety systems. Leverages advanced diagnostic capabilities in smart valve technologies and predictive maintenance programs to enhance reliability and operational performance.
Overview
26
26
years of professional experience
1
1
Certificate
Work History
Commissioning Mechanical Technician
Dubai Petroleum
Dubai, United Arab Emirates
06.2025 - Current
- Perform commissioning of rotating and static equipment such as pumps, compressors, valves, piping, HVAC and hydraulic systems.
- Conduct detailed inspections, functional and leak testing, alignment, and performance verification to ensure equipment readiness and operational safety.
- Prepare and complete commissioning documentation, including Inspection Test Records (ITR), check sheets, test packs, and turnover dossiers.
- Troubleshoot mechanical defects, installation issues, and operational abnormalities during commissioning and start-up phases.
- Coordinate with multidisciplinary teams and vendors to achieve safe and efficient system start-up and handover
- Drive system walkdowns, punch-list resolution, and turnover documentation to achieve timely and compliant project handovers.
- Interpreted P&IDs, isometrics, and mechanical drawings to validate installations and commissioning readiness
- Coordinate multidisciplinary teams, vendors, and stakeholders to resolve mechanical issues, minimize downtime, and ensure seamless startup.
- Maintain strict compliance with HSE, QA/QC, and project standards, achieving zero LTI during commissioning activities.
Lead AMS Maintenance Engineer
Tengizchevroil
Tengiz, Kazakhstan
06.2022 - 06.2025
- Led commissioning and start-up readiness of 7,000+ automated valves, managing full lifecycle from FAT to SAT in compliance with ANSI/FCI-70-2, ANSI B16.104, API 598, IEC 61508, IEC 61511, and ANSI/ISA 84.00.01.
- Reviewed and validated valve datasheets, loop drawings, hook-ups, P&IDs, PFDs, I/O lists, SIS validation documents, control narratives, and cause & effect matrices.
- Verified operation, configuration, and reliability of MOVs, anti-surge valves, HIPPS, deluge systems, pressure safety valves, and wellhead control panels to ensure process safety and availability.
- Utilized Chevron commissioning and maintenance platforms, including IPMS, CMS/Coreworx, SCMT, Power BI, and JDE for tracking, reporting, and data analytics.
- Contributed to critical valve analysis and preservation programs, applying lessons learned to improve reliability and maintenance strategy.
- Delivered technical coaching and capability development for 6 AMS maintenance & reliability engineers, strengthening valve reliability practices.
- Implemented actuator resizing and increased PST/FST coverage for SDVs as interim mitigation, maintaining SIL-3 compliance pending actuator upgrades.
- Completed comprehensive documentation of testing and repair activities, including service reports, work orders, and diagnostic records using ValveLink.
- Conducted valve interrogation during overhauls to identify latent defects and failure mechanisms not previously detected to prevent unsafe equipment failures.
- Monitored smart valve alerts and diagnostic trends to support predictive maintenance and troubleshooting of underperforming assets, enhancing plant safety and reliability.
Senior Maintenance Supervisor
Beamco Nigeria Limited
Lagos, Nigeria
03.2021 - 04.2022
- Supervised maintenance projects both in workshop and on-site environments, covering a wide range of rotating equipment, including Flowserve overhung and between-bearing pumps, reciprocating pumps, velocity pumps, and compressors of various OEM.
- Led installation, pre-commissioning, and commissioning of pumps at client sites, including alignment verification, coupling checks, lubrication confirmation, rotation checks, and performance testing before handover.
- Led troubleshooting and execution of breakdown, preventive, and corrective maintenance activities for pumps, compressors, control valves, and safety valves.
- Diagnosed and resolved common pump issues, including leakage, abnormal noise, vibration, overheating, cavitation, and performance degradation.
- Performed equipment disassembly, inspection, repair, and replacement of critical components, including bearings, gearboxes, seals, shafts, and wear rings.
- Conducted scheduled inspections, servicing, and major overhauls to reduce unplanned downtime and improve equipment reliability.
- Verified internal clearances and dimensional tolerances prior to assembly using precision instruments, including vernier calipers, micrometers, screw gauges, and calibrated torque wrenches.
- Prepared detailed DCI and service reports outlining repair scope, replaced components, test results, and calibration records for safety and control valves, ensuring traceability and audit compliance.
Field Service Specialist (Valves)
Siemens LLC, UAE
Dubai, United Arab Emirates
03.2019 - 11.2020
- Led and executed major shutdown and outage maintenance activities on fuel control valves, gas control valves, and fuel/gas shutdown valves, along with associated rotating equipment (Fuel pumps and Knox water pumps) supporting Siemens SGT-series gas turbine systems at client power plants.
- Managed critical-path activities during planned outages, coordinating with turbine, I&C, and mechanical teams to ensure timely execution, safe restart, and adherence to OEM technical procedures.
- Directed disassembly, inspection, refurbishment, calibration, and functional testing of valves and hydraulic systems to restore optimal combustion control and turbine protection integrity.
- Provided start-up support post-outage, validating valve stroking, actuator response, hydraulic pressure stability, and system interlocks before turbine synchronization.
- Ensured full compliance with safety standards, permit-to-work systems, and OEM specifications while minimizing downtime and maintaining outage schedules.
- Prepared comprehensive service documentation, including inspection reports, maintenance logs, repair records, calibration data, and failure analysis reports.
- Responded to emergency breakdowns and unplanned failures, minimizing production losses through rapid fault identification and corrective action.
- Implemented preventive maintenance strategies and continuous improvement initiatives to enhance equipment availability and long-term system performance.
Service Engineer
Emerson Automation Solutions
Dubai, United Arab Emirates
10.2012 - 03.2019
- Executed shutdowns, turnarounds, and preventive maintenance on control valves, SDV/ESDV, and PSV/PRV systems, ensuring safe, on-time plant restart in oil & gas, LNG, and industrial facilities
- Installed, commissioned, calibrated, and troubleshoot control valves, including pneumatic, hydraulic, and electric actuators, including rotary and linear valves, improving process reliability and minimizing downtime.
- Utilized Valve Link software to monitor, diagnose, and optimize Fisher control and shutdown valves, performing service, calibration, and preventive maintenance to ensure reliable valve performance and compliance with operational specifications.
- Completed hydrotesting, seat leakage testing, and final commissioning verification before startup
- Performed PSV bench testing, set pressure calibration, pop testing, seat leakage testing, actuator overhauls, and smart positioner diagnostics in compliance with API standards
- Troubleshoot valve failures, including passing, sticking, actuator leaks, trim wear, and positioner faults, reducing unplanned maintenance and optimizing plant performance
- Prepared ITRs, calibration reports, service reports, commissioning documentation, and QA/QC records, while adhering to PTW, LOTO, isolation, and safety compliance protocols.
- Interpreted P&IDs, datasheets, valve drawings, and mechanical specifications to support maintenance, commissioning, and shutdown activities.
Field Service Engineer
Rotork Controls
Abu Dhabi, United Arab Emirates
01.2009 - 10.2012
- Installed, commissioned, and calibrated Rotork electric actuators (IQ, A-Range, Skillmatic) on ball, butterfly, gate, plug, and control valves.
- Performed preventive and corrective maintenance, troubleshooting, and repair of electric actuators, gearboxes, and valve control systems (Rotork Master-station).
- Conducted FAT/SAT, functional testing, and on-site actuator performance validation.
- Diagnosed faults using electrical, mechanical, and electronic test equipment; provided root cause analysis and technical reporting.
- Prepared detailed service reports, inspection checklists, and commissioning documentation.
- Ensured strict compliance with HSE standards, ISO/IEC/ANSI guidelines, and site-specific safety requirements.
- Maintained spare parts inventory, tools, and calibration equipment for field service operations.
Facility Engineer
Solid Mills Inc
Paranaque, Metro Manila, Philippines
01.2000 - 11.2008
- Ensured reliable operation of plant utilities, including chillers, cooling towers, air compressors, boilers, pumps, HVAC, and water treatment system
- Maintained an uninterrupted supply of chilled water, steam, compressed air, and process water to production lines.
- Developed and implemented preventive and predictive maintenance programs to maximize equipment uptime.
- Troubleshot equipment failures and conducted root cause analysis to prevent recurrence.
- Monitored and optimized energy consumption (electricity, fuel, water) to reduce operating costs.
- Supervised maintenance technicians and utility operators to ensure safe and efficient operations.
- Managed facility repair, upgrade, and installation projects, including contractor coordination.
- Maintained accurate maintenance records, technical documentation, and compliance reports.
Education
Mechanical Engineering
Polytechnic University of The Philippines
Manila, Metro Manila, Philippines04.1998
Skills
Mechanical Commissioning and Pre-Commissioning
Shutdown/Turnaround Execution
Valve Automation and Actuation Systems
Pump Equipment Maintenance and Overhaul
Preventive & Predictive Maintenance Programs
Maintenance & Reliability
HSE Compliance & Permit to Work Systems
Valve Diagnostics (AMS / Valvelink / DCMLink / Valvevue)
Workpack, ITR & Turnover Dossier Preparation
Instrument Calibration
Certification
Sparrows, Basic Rigging and Slinging
Edil Oral, EX Inspection & Auditing
Chevron, SIS-101 Instrumented Protective Systems
Flowserve, Mk1 Valve Product Training
Flowserve, Engineered Overhung Pump Repair
Flowserve, Between Bearing Pump Repair
Siemens AG, Maintenance of Pruss Valves and Rexroth Actuators
Emerson Automation Solutions, Pressure Regulator Training
Emerson Automation Solutions, Fieldvue Digital Valve Controller with Valvelink (1760 to 1763)
Biffi Italia School of Actuators, Basic Piston Actuator Service Training
Vanessa Valves, Butterfly Triple Offset Valve Service Training
Meralco Foundation Inc, Industrial Process Control
Meralco Foundation Inc, Calibration for Process Instrument
Timeline
Commissioning Mechanical Technician
Dubai Petroleum
06.2025 - Current
Lead AMS Maintenance Engineer
Tengizchevroil
06.2022 - 06.2025
Senior Maintenance Supervisor
Beamco Nigeria Limited
03.2021 - 04.2022
Field Service Specialist (Valves)
Siemens LLC, UAE
03.2019 - 11.2020
Service Engineer
Emerson Automation Solutions
10.2012 - 03.2019
Field Service Engineer
Rotork Controls
01.2009 - 10.2012
Facility Engineer
Solid Mills Inc
01.2000 - 11.2008
Mechanical Engineering
Polytechnic University of The Philippines