How to source legacy pump parts when OEM production has ended
TL;DR
- Classification societies require replacement parts to meet the original design; non-conforming parts can invalidate class and insurance.
- The MAIB investigation into the Kommandor Susan engine-room fire identified non-genuine bearings fitted during an earlier overhaul and examined their role in the failure sequence.
- OEM production follows material qualification, precision machining, heat treatment, inspection, and certification.
Fitting the wrong replacement part to a ship's/asset's main system is a classification and safety problem. This guide is for OEM quality, engineering, and operations leads who specify and source genuine pump parts. It explains what OEM quality means, why it matters for, how genuine parts are made, and how to qualify a manufacturer.
For OEMs, the challenge is often not how to manufacture a part, but how to keep low-volume legacy parts available economically decades after original production ends.
Why legacy PUMP parts still need to meet OEM specification
When a production run ends, the classification requirement does not. Parts fitted to a classed vessel/asset must still meet the original design specification regardless of when that specification was released.
A part qualifies as OEM specification when it meets all of the following:
- Produced from OEM-released design files at the current revision
- Material grades and tolerances specified by the original designer, not reverse-engineered from an existing component
- Material certification to EN 10204 and a dimensional inspection report
- Traceability linking the part to its material batch and inspection records
- Classification approval or documentation where required by the vessel's class society
Under operating load, dimensional or metallurgical variance from the original specification affects wear, service intervals, and failure risk.
What are the risks of fitting non-OEM parts?
Classification societies require replacement components to meet the original design specification. Parts that deviate from approved specifications can trigger class non-conformances, require additional surveys, and may affect insurance claims following an incident.
The MAIB traced a 2025 engine-room fire on the site investigation vessel Kommandor Susan to non-genuine bearings fitted during a 2019 overhaul. The bearings were not approved by the engine OEM and showed weaker material bonding than genuine parts.
Extended service intervals are often validated only for OEM components. Substituting non-genuine parts can void the maintenance basis the engine was certified against.
Non-conforming parts on a pump system can trigger survey requirements and, in the worst case, ground the vessel/asset. For operators, the downtime and the cost of an unplanned repair usually exceed the unit-price saving on a non-genuine part.
How legacy PUMP parts are produced on demand from OEM design files
When a component is no longer in standard production, the supply route changes. The certification requirement does not.
On-demand production for legacy pump parts starts from the same point as conventional production: the OEM-released design file. That file specifies the material grade, dimensional tolerances, and surface requirements the original designer approved. A manufacturing partner with access to that file under controlled conditions produces a component to the same specification as the original production run.
The production sequence follows the same steps as conventional manufacture:
| Step | What happens | Output |
| Material qualification | Material grade confirmed against the OEM-released drawing | EN 10204 material certificate |
| Heat treatment | Core hardness achieved where the drawing specifies | Heat treatment record |
| Dimensional inspection | Coordinate measuring machine verification against current drawing revision | Inspection report |
| Certification and traceability | Records linked to material batch, drawing revision, and production partner | Documentation package |
For legacy components, the critical governance point is design file provenance. Parts produced from reverse-engineered measurements rather than OEM-released files do not qualify as genuine, regardless of the manufacturing method. File provenance is what classification societies and OEM warranty terms require.
Which standards and certifications apply to PUMP parts?
The standards framework for legacy marine engine parts is the same as for any current-production component on a classed vessel. On-demand production from OEM design files does not reduce or change those obligations.
Type approval is published by each classification society, including American Bureau of Shipping, Bureau Veritas, DNV, Lloyd's Register, ClassNK and Korean Register.
For additive manufacturing specifically, DNV-ST-B203 and equivalent ABS requirements define the process qualification and part verification framework. These apply to legacy components on the same basis as current-production parts.
How does on-demand manufacturing apply to legacy marine engine parts?
On-demand manufacturing produces legacy pump parts from OEM-controlled design files when they are needed, rather than holding them as physical stock. It carries the same certification obligations as conventional production.
Additive processes (such as powder bed fusion or directed energy deposition) can shorten lead times for parts no longer in regular production. Classification approval still applies and is subject to applicable survey requirements.
The route must trace to OEM-released files, with process qualification, material certification, and non-destructive testing before parts are fitted to a classed engine. The production method changes the lead time and the economics, but the certification of the part remains the same.
Frequently asked questions
Do non-genuine pump parts affect a vessel's classification or insurance?
Classification societies require components on classed engines to meet the original design specification. Fitting parts that deviate from approved specifications can trigger class non-conformances, require additional surveys, and may affect insurance claims following an incident. The applicable consequences depend on the component and the class society.
What documentation should accompany a pump part at delivery?
A genuine pump part should arrive with a material certificate (EN 10204 3.1 or 3.2 as specified), a dimensional inspection report against the current drawing revision, and classification records where the component requires approval. Dispatch documentation should link the part to its material batch and production records.
Can legacy pump parts still be produced to OEM specification?
Legacy parts can be produced to OEM specification when the original design files are available and access-controlled. On-demand manufacturing from those files delivers genuine parts for engine types built fifteen to twenty-five years ago, without holding physical stock. The parts trace to the original specification and meet classification requirements when the process is qualified.
Does additive manufacturing meet classification requirements for pump parts?
Additive manufacturing meets classification requirements when it is produced under a qualified process from OEM-controlled design files. That means process parameter validation, material qualification, and non-destructive testing are verified before parts are fitted to a classed engine. Classification approval is subject to applicable survey requirements for the specific component.
Key Takeaways
- A pump part is only OEM quality if it comes from the manufacturer's released design files at the current revision.
- Non-conforming parts on an asset can invalidate class approval and insurance, beyond the risk of failure in service.
- The Kommandor Susan fire shows the operational cost of substitute parts can far exceed the unit-price saving.
- Legacy parts produced on demand from OEM files meet the same certification standard as conventionally made parts.