Many vessels, offshore installations, and industrial energy assets continue operating equipment that was installed decades ago.
As assets age, replacement parts become harder to source. Lead times increase, inventory is reduced, and some parts become increasingly difficult to obtain through traditional channels.
When a critical component is needed urgently, operators often gather options to decide between waiting for a genuine part or sourcing through gray market channels.
This article explores the factors operators should consider when making that decision and how new supply models are helping to address legacy parts availability challenges.
Availability challenges are becoming more common across the maritime and energy sectors.
While these assets continue to perform important operational functions, maintaining them often requires replacement parts that were originally designed for equipment no longer in active production.
Several factors have contributed to increased attention on gray market parts:
As the challenge of supporting legacy parts continues to grow across maritime and energy sectors, availability constraints are becoming increasingly common.
Supporting legacy equipment remains important for both maritime and energy industries, where asset lifecycles often extend well beyond original expectations. Yet maintaining availability across a large legacy portfolio can become increasingly difficult over time.
These factors can create genuine parts shortages even when OEM support remains available. When downtime carries operational and commercial consequences, gray market sourcing can appear to offer a practical alternative.
The concern is whether the part can be trusted to perform as intended throughout its service life. Potential risks include:
Traceability is often particularly important for critical equipment operating in regulated environments. Without documented manufacturing history and supporting records, it can be difficult to verify how a part was produced or whether it meets the original requirements.
Documentation may also become an issue. Depending on the application, operators may require certification records, inspection reports, material documentation, or other supporting evidence during maintenance activities, audits, inspections, or surveys.
Compatibility presents another consideration. A replacement component may appear physically similar to the original part but may not fully align with the specifications, manufacturing controls, or performance expectations established by the OEM while increasing the reliability risk over time.
For critical equipment, these risks may not become visible immediately after installation. In some cases, concerns only emerge later during operation, maintenance intervals, inspections, or reliability reviews.
A recent investigation by the UK Marine Accident Investigation Branch (MAIB) into the vessel Kommandor Susan highlighted this issue. The report found that non-genuine engine components fitted during a previous overhaul contributed to a catastrophic diesel generator failure and subsequent engine room fire during sea trials.
Genuine parts provide advantages that extend beyond immediate availability. Key considerations include:
These controls help provide confidence that replacement components have been manufactured according to the requirements established for the original equipment.
Genuine OEM parts, therefore, offer benefits that go beyond simple replacement. They support consistency, reliability, and confidence throughout the equipment lifecycle.
To improve the availability of legacy parts, many genuine makers are adopting on-demand manufacturing models.
Rather than relying solely on physical inventory, OEMs are increasingly maintaining digital inventory and approved manufacturing routes that allow parts to be produced when required. When demand occurs, components can be produced through qualified production routes while maintaining OEM oversight, documentation, and traceability.
This approach helps support aging equipment while maintaining OEM oversight of specifications, quality requirements, documentation, and traceability.
For operators, this creates an additional pathway to access genuine OEM replacement parts, particularly when traditional stock is unavailable or difficult to source.
Importantly, on-demand manufacturing is not limited to a single production technology. Depending on the component, production may use conventional manufacturing methods, additive manufacturing, or a combination of processes that meet the OEM's requirements.
As maritime and energy assets continue operating beyond their original design life, genuine parts availability will remain a growing challenge.
Gray market parts may appear to solve an immediate supply problem, but they can introduce risks that only become visible later in operation.
OEM-authorized on-demand manufacturing is creating new ways to support legacy equipment while maintaining the standards, documentation, and traceability associated with genuine parts.
For operators facing difficult-to-source replacement parts, understanding the available OEM-supported options before turning to gray market channels can help protect long-term asset performance.
As on-demand manufacturing becomes a more common approach for supporting legacy parts, it is helpful to understand how the model works and how on-demand manufactured parts retain OEM-approved quality. This is explored in The Parts Manufacturing Process: An Introduction to On-Demand Production for OEMs.
Start with our guide to the on-demand parts manufacturing process.