In early 2025, a fleet manager in Hamburg discovered that a routine cylinder liner replacement for one of his Capesize bulk carriers would take not 10 days, but nearly eight weeks. The reason had nothing to do with the part itself — it was the shipping lane it had to travel through. Situations like this are becoming the norm, not the exception.

The maritime industry has long optimized for efficiency and minimal overhead. But as tensions between the US and Iran escalate and instability in the Red Sea persists, the supply chains that once ran like clockwork are now subject to forces far beyond any operator's control. The Strait of Hormuz alone handles roughly 20% of global oil shipments. When that chokepoint is under threat, the effects cascade — war risk premiums spike, vessels reroute around the Cape of Good Hope adding 10 to 14 days per voyage, and the availability of marine spare parts becomes unpredictable.

This is pushing the industry toward a difficult but necessary question: is the traditional "Just-in-Time" approach to spare parts procurement still viable?

Why Just-in-Time Falls Apart Under Pressure

Just-in-Time procurement works on a simple premise: order what you need, when you need it. In maritime operations, this has meant scheduling parts deliveries around planned maintenance windows or dry-docking dates. It keeps inventory costs low and capital free. The problem is that JIT assumes stable logistics — reliable transit times, open trade routes, and accessible suppliers.

None of those assumptions hold in the current environment.

Lead Times That No Longer Mean Anything

A marine spare parts supplier quoting 7-to-10-day delivery on a fuel injector set is basing that estimate on normal routing. When the Red Sea is avoided and Hormuz is contested, that same shipment may need to travel an additional 3,500 nautical miles. But the delay is not just about distance. Alternative ports become congested as rerouted traffic converges, and air-freight capacity tightens as multiple operators compete for the same emergency logistics corridors.

When Your Supplier's Supplier Is Also Affected

Many marine engine parts are manufactured in specialized industrial clusters that depend on raw materials passing through the very corridors now under threat. A conflict escalation can throttle factory output through energy rationing, labor disruptions, or export restrictions — none of which are visible to the end buyer until the delivery date passes without a shipment. For a vessel mid-voyage that needs a $500 sealing kit to stay operational, this invisible upstream disruption can become a six-figure problem.

The Case for Just-in-Case

The alternative is straightforward in concept, though it requires a shift in mindset. "Just-in-Case" (JIC) inventory management accepts a higher carrying cost in exchange for availability. It treats critical spare parts not as a line item to minimize, but as operational insurance.

Identifying What Actually Matters

Not every part needs to be stockpiled. The starting point is a criticality analysis — identifying components that are essential for continued operation and have the longest or most volatile lead times. For most commercial vessels, this list includes:

• Fuel injectors, nozzles, and high-pressure pump assemblies

• Turbocharger bearings, seal rings, and compressor wheels

• Cylinder liners, piston rings, and cylinder head valves

• Sealing kits for pumps, compressors, and purifiers

• Fuel and lube oil filter elements

These are the components where a two-week delay can ground a vessel.

Pre-positioning Instead of Reacting

Rather than shipping parts to a specific port on demand, JIC involves placing inventory at stable global hubs — locations like Busan, Singapore, or Rotterdam — so that critical spares are always within short-haul reach of the fleet. If a conflict closes one corridor, the parts are already outside the affected zone and ready for dispatch.

Diversifying the Supply Base

Single-source procurement is a risk multiplier during geopolitical disruption. Working with suppliers who maintain verified networks across multiple regions means that when one source is compromised, alternatives are already qualified and available. This is not about having more suppliers — it is about having the right suppliers in the right places.

What Unpreparedness Actually Costs

The resistance to JIC typically comes from finance teams looking at warehouse costs. That concern is understandable — until you compare it against what happens when a vessel cannot get the parts it needs.

Off-Hire Losses

A vessel waiting for a critical engine component is a vessel earning nothing. Depending on the type — VLCC, Capesize, or large container ship — daily off-hire costs range from $15,000 to over $100,000. A 14-day delay caused by a rerouted shipment can mean losses exceeding $1 million before the cost of the part itself is even factored in.

Emergency Procurement Premiums

When a part is needed immediately in a disrupted market, the component price becomes almost irrelevant. What matters is getting it to the vessel. Emergency air freight, expedited customs handling, and courier services routinely add 2x to 5x on top of the standard cost. In many cases, the logistics of an emergency delivery cost more than the marine spare parts being delivered.

The Regulatory Knock-on Effect

There is a less obvious but equally significant cost. Under the IMO's Carbon Intensity Indicator (CII), vessels are rated annually on their operational carbon efficiency. A ship running on degraded engine components — worn turbochargers, fouled injectors, suboptimal filtration — burns more fuel per nautical mile. If a vessel then has to increase speed to recover lost schedule time, fuel consumption rises exponentially. The result is a worse CII rating, which can trigger mandatory corrective action plans and damage the owner's commercial standing with charterers who increasingly demand green credentials.

Building a Supply Chain That Holds Up

The role of a marine spare parts supplier has changed. It is no longer sufficient to take an order and ship a box. What operators need now is a partner that can absorb disruption on their behalf — someone with the network to source from multiple regions, the infrastructure to hold inventory, and the responsiveness to move when situations change overnight.

This is the approach BAS KOREA has built its operations around. With sourcing relationships across more than 20 countries, we maintain access to genuine and OEM-certified marine engine parts through diversified channels. When one supply route is compromised, we source through another without delays in qualification or certification.

Our warehouse operations in Busan allow clients to purchase and store critical spares during stable market conditions, effectively pre-positioning their inventory at one of Asia's largest port complexes. When a vessel needs parts, we consolidate components from multiple international origins into a single optimized shipment — reducing customs complexity and ensuring the crew receives everything needed for a major overhaul in one delivery rather than fragmented arrivals over weeks.

Conclusion

The tensions reshaping the Strait of Hormuz and the Red Sea are not temporary disruptions that will resolve and return the industry to business as usual. They are part of a broader pattern where geopolitical risk is now a permanent variable in fleet operations.

For ship owners and fleet managers, the practical takeaway is clear. The cost of holding strategic inventory — a few thousand dollars per year in warehousing — is negligible compared to the cost of a single off-hire incident or emergency procurement event. Operators who move from reactive ordering to proactive inventory planning will not just avoid losses; they will maintain tighter maintenance schedules, protect their CII ratings, and negotiate from a stronger position with charterers.

The supply chains that survive disruption are the ones that were built to expect it.

For inquiries regarding strategic spare parts planning and global sourcing, please contact BAS KOREA.