Oil & Gas / Offshore Platforms
Offshore platform electrical engineering for critical power, variable speed drives, switchgear and control systems supporting planned maintenance, shutdowns, equipment replacement and life-extension projects.
Sector Overview
Supporting Critical Electrical Systems on Offshore Platforms
Offshore production assets depend on electrical systems that must remain dependable despite demanding duty cycles, restricted access and equipment that may have been in service for many years. When drives, switchgear or control equipment becomes unreliable or obsolete, the challenge is often not simply replacing a component: the replacement has to work with the existing installation and fit within a tightly controlled maintenance or shutdown programme.
MJR supports offshore platforms with electrical engineering, repair, testing, retrofit and replacement of critical equipment. Capability covers LV and HV switchgear, variable speed drives and converters, generators and transformers, UPS and power electronics, automation, instrumentation and associated control systems. Where existing equipment can no longer be supported, MJR can engineer a replacement around the retained installation rather than requiring the wider system to be rebuilt.
Who MJR supports Offshore platform operators, asset managers, maintenance managers, electrical teams, service departments and project teams responsible for maintaining, upgrading or replacing offshore electrical power and control equipment.
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Sector Challenges
Maintaining Ageing Electrical Assets Within Limited Offshore Windows
Platform upgrades are often carried out around equipment that cannot simply be taken out of service for long periods. Existing interfaces, obsolete hardware, offshore access and shutdown sequencing all affect how the work has to be engineered and delivered.
Obsolete & Unsupported Equipment
Older VFDs, converters, switchgear, PLC equipment and electronic assemblies can become difficult to maintain as manufacturers withdraw parts and technical support. MJR specifically provides troubleshooting and engineered replacement packages where continued repair is no longer practical.
Restricted Shutdown Windows
Major electrical replacements may need to be completed during a planned shutdown with little tolerance for delay. Surveys, engineering, fabrication and testing therefore need to be completed before mobilisation wherever possible. The Eni Douglas project was delivered within a planned platform shutdown.
Existing System Interfaces
Replacement equipment must work correctly with retained motors, cables, protection, control systems and upstream distribution. Interface definition is particularly important when only part of an ageing installation is being replaced.
Drive & Power Quality Issues
Large variable speed drives and power-electronic equipment can introduce requirements around harmonics, filtering, protection and compatibility with the existing electrical network. MJR’s consultancy capability includes harmonic, load-flow, short-circuit and protection studies.
Offshore & Hazardous-Area Requirements
Equipment selection, installation and modifications need to reflect the operating environment and project-specific safety requirements. MJR's engineering capability includes safe and hazardous-area design, electrical control systems, fire and gas systems and safety shutdown systems.
Sector Benefits
Extending Equipment Life Without Losing Sight of the Existing Installation
For an established offshore asset, the right answer is not always wholesale replacement. MJR assesses what can remain in service, what needs attention and how replacement equipment will interact with the existing platform electrical system.
Planned Obsolescence Management
Unsupported equipment can be identified and addressed before failure forces an unplanned response, allowing repair, spares or replacement strategies to be developed around operational priorities.
Targeted Retrofit
Drives, switchboards, controls and power-electronic equipment can be replaced as defined packages while retaining serviceable parts of the wider installation.
Better Maintainability
Modern replacement equipment can provide improved fault information, diagnostics and access to supported components, giving maintenance teams a clearer route for future servicing and troubleshooting.
Tested Before Mobilisation
Where practical, replacement switchboards, control panels and electrical packages can be engineered, constructed and tested before offshore installation, reducing the amount of unresolved work taken into the shutdown window. MJR's service model combines in-house engineering and construction with offshore installation and commissioning capability.
How MJR Supports the Sector
From Fault Investigation to Engineered Replacement
MJR can support an individual electrical problem or take responsibility for a wider upgrade package, keeping engineering, equipment build, installation and commissioning connected throughout the project.
Consultancy & Design
Site and offshore surveys, FEED, detailed electrical design, equipment specifications, hazardous-area design and technical studies covering load balance, short circuit, protection, harmonics and system performance.
Engineering & Construction
Engineering and build of replacement switchboards, MCCs, drive and control panels, power-distribution equipment, automation systems and project-specific electrical packages.
Installation & Commissioning
Removal of obsolete equipment, retrofit installation, LV/HV power cabling, instrument and control cabling, termination, testing and commissioning carried out around existing equipment and project constraints.
Service, Repair & Testing
Fault diagnosis, maintenance and testing for LV/HV switchgear, generators, transformers, VFDs, converters, UPS systems, power electronics, automation and instrumentation, including support for third-party equipment.
Typical Applications
Electrical Support for Critical Offshore Platform Systems
MJR's capability is most relevant where ageing electrical equipment, production-critical loads or planned upgrade work requires engineering support beyond straightforward component replacement.
VFD & Motor Drive Systems
Fault finding, servicing, replacement and retrofit of variable speed drives and converters used on pumps and other electrically driven platform equipment, including associated filtering and control interfaces.
LV & MV Switchgear
Testing, maintenance, overhaul and replacement of platform switchboards, motor control centres and distribution equipment, together with protection and associated control systems.
Power Conversion & Essential Power
Support for UPS systems, converters, power electronics, generators, transformers, excitation systems and other equipment forming part of the platform electrical supply.
Automation, Instrumentation & Control
PLC, SCADA and DCS systems, instrumentation, control panels, monitoring systems and project-specific safety or shutdown control equipment. MJR's current engineering scope includes these systems alongside electrical and pneumatic/hydraulic control equipment.
Share your equipment details, existing drawings, fault history or replacement requirements with MJR.
The Questions We Get Asked Most
Practical answers for offshore operators and maintenance teams planning electrical service, repair or upgrade work.
