Ship Machinery Failure Downtime, Spare Strategy & Repair Cost Tool

Failure Exposure, Repair Cost, Economic Downtime, Spare Service Level, Fleet Pooling, Inventory Carry & Lifecycle Strategy

Ship Machinery Failure Downtime, Spare Strategy & Repair Cost Tool

Model what machinery failure really costs after repair materials, labour, economic downtime, sourcing delay, emergency freight and spare inventory are combined. Simple mode compares no dedicated spare with one onboard spare. Advanced mode compares no spare, fleet shore pool and onboard stock across multiple machinery families using lead-time demand and stockout probability.

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Need fleet pooling and stockout risk? Click Advanced above. Add fleet size, diagnosis and labour, replenishment freight, shore dispatch, onboard handling, carrying and obsolescence cost, multiple machinery families, Poisson lead-time demand, 95% target stock, economic stock quantity and lifecycle NPV.

Fast One-Spare Decision Screen

Simple mode compares no dedicated spare with one onboard spare and assumes the onboard spare is available for each addressable failure. Stockout and replenishment risk are deliberately reserved for Advanced mode.

Machinery / component type

Expected failures per yearFailures/year for the screened machinery family on one vessel.

Hands-on repair timehours/failure after the required part is available.

Economic downtime valueSelected currency / hour.

Base repair materials / servicesSelected currency / failure, excluding the strategic spare.

Failures addressable by this spare%.

Spare unit purchase price

No-spare sourcing / delivery delayhours added to addressable failures.

Emergency sourcing / freight per event

Annual inventory burden on onboard spare% of spare value/year for capital, storage, deterioration and administration.

Fleet & Repair Logistics

Vessels in strategy

Troubleshooting / diagnosis timehours/failure.

Repair labour costSelected currency / labour hour.

No-spare emergency freight / sourcing cost

Normal replenishment freight per spare

Shore-pool dispatch cost / event

Onboard spare retrieval / handling delayhours.

Annual inventory carrying cost% of stocked value/year.

Annual obsolescence / deterioration% of stocked value/year.

Target spare service level% probability lead-time demand does not exceed stock.

Economic horizonyears.

Discount rate%.

Machinery & Critical Spare Register

Each row represents one machinery / spare family. Onboard stock is per vessel. Shore-pool stock is shared across the entered fleet. Row labels are not submitted to Ship Universe Tool Data.

Machinery / spare	Qty / vessel	Failures / asset-yr	Exposure %	Repair h	Repair team	Downtime / h	Base repair	Spare coverage %	Spare price	Onboard qty / vessel	Pool qty	No-spare lead h	Pool delivery h	Replenish days	Criticality

Strategy & Governance Readiness

Failure history / PMS data reviewedEntered frequency is based on fleet history, OEM data or another documented basis. Criticality / redundancy reviewedSafety, statutory, mission and functional redundancy are assessed separately from economics. OEM / class spare recommendation reviewedRequired or recommended critical spares are not removed solely because ROI looks weak. Lead times validated with suppliersNormal and emergency logistics reflect actual vendor / port / trade conditions. Shelf life / preservation plan definedLong-stored bearings, seals, electronics, oils and rotating spares are preserved appropriately. Pool dispatch process testedCustoms, warehouse, courier and vessel handover responsibilities are defined. Onboard storage / lifting / access checkedMass, dimensions, preservation, handling and removal route are practical. Failure coding / feedback loop definedActual failures, spare usage and lead times will update future stock decisions.

Reliability and inventory screen: do not determine critical-spare policy from financial return alone. Safety, statutory requirements, redundancy, OEM recommendations, class requirements, mission requirements, shelf life, commonality, repairability and actual supply-chain conditions can justify carrying a spare even when direct economic ROI is weak. The lead-time demand model is a Poisson planning approximation, not a full inventory simulation.

Maintenance-planning context: DNV planned-maintenance arrangements are based on preventive maintenance using defined tasks, acceptance criteria and intervals, normally aligned with OEM recommendations. DNV's reliability-centred maintenance approach additionally uses operational experience and functional risk impact to optimize maintenance rather than relying only on fixed OEM intervals. This tool applies the same general principle to spare strategy: economic exposure matters, but criticality and operating experience remain separate decision inputs. DNV Planned Maintenance System · DNV PMS Reliability-Centred Maintenance

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