Most mining maintenance plans run on habit — this asset gets serviced every 250 hours because it always has. FMEA for mining equipment replaces habit with evidence: you list how each machine can fail, score how bad, how likely and how hard-to-catch each mode is, and let the numbers decide where effort goes. Done right, it tells you which crusher bearing or haul-truck brake to watch before it strands production. This guide walks the method for mobile fleet and fixed plant. Book an FMEA-driven maintenance demo to see it applied.
Let the failure modes decide where maintenance goes
FMEA scores every way a machine can fail by severity, likelihood and detectability — turning a gut-feel PM schedule into a ranked risk plan for both mobile fleet and fixed plant.
FMEA — failure mode and effects analysis — is a structured way to ask three questions about every component on a machine: how could it fail, what happens when it does, and how do we catch it coming. Score those, multiply them into a risk priority number, and your maintenance plan writes itself from the top down. Below is how the scoring works, a worked worksheet for mining assets, how mobile and fixed plant differ, and how the output becomes real PM and inspection tasks.
S × O × Dhow the risk priority number ranks every failure mode
Each failure mode gets three scores from 1 to 10. Multiply them and you get the RPN — a single number from 1 to 1000 that sorts your whole fleet's risks into priority order.
How bad is the consequence if it fails? A safety hazard or a stopped crusher scores high; a cosmetic fault scores low.
How likely is this failure mode to happen? Scored from your real failure history, not a guess.
How hard is it to catch before it fails? A hidden fault with no warning scores high — that's the dangerous one.
The priority score. The higher it is, the sooner that failure mode needs a maintenance response.
The detection score is the one teams underrate: a failure that's severe and likely but easy to spot on inspection is manageable; one that's severe, likely and gives no warning is where incidents come from. FMEA forces that into the open. See inspection templates built around the hard-to-detect modes, or book a demo of FMEA-driven inspections.
The worksheeta worked FMEA for mining equipment and fixed plant
Here's what a few rows look like across a mixed mining operation. The RPN column is what you sort on — and act on first.
| Asset | Failure mode | S | O | D | RPN | Priority |
|---|---|---|---|---|---|---|
| Crusher | Main bearing seizure | 9 | 4 | 7 | 252 | Act now |
| Haul truck | Brake system loss | 10 | 3 | 6 | 180 | Act now |
| Conveyor | Belt tear / splice failure | 7 | 5 | 4 | 140 | Plan |
| Excavator | Hydraulic hose rupture | 6 | 5 | 3 | 90 | Plan |
| Dozer | Undercarriage wear | 5 | 6 | 2 | 60 | Monitor |
| Screen | Spring fatigue | 4 | 3 | 3 | 36 | Monitor |
Notice the brake failure: lower occurrence than the bearing, but a severity of 10 keeps its RPN high — exactly the kind of low-frequency, high-consequence mode a habit-based schedule misses. See failure-history reporting for real occurrence scores, or sign up free and standardize your failure codes.
What each score triggersturning RPN bands into maintenance action
A number alone changes nothing. Set thresholds so each RPN band points to a defined response — that's where FMEA becomes a plan.
Condition monitoring, tightened PM interval, or redesign. The highest-risk modes get engineered attention first.
Scheduled PM task or targeted inspection added. Managed proactively, not left to run to failure.
Routine inspection coverage is enough. Revisit if occurrence climbs in the failure data.
Thresholds are yours to set — a safety-critical operation may drop the "act now" line lower. What matters is that every high score has a standing response, so nothing severe sits unaddressed. See PM scheduling that turns each high-RPN mode into a recurring task, or book a demo of RPN-driven PM planning.
Mobile vs fixed plantwhy FMEA looks different on a haul truck and a crusher
Both need FMEA, but the failure character differs — and so does the detection and consequence scoring.
Haul trucks, loaders, dozers
- Failures spread across many identical units — occurrence scored from fleet history
- Operator and duty variation drives a lot of the risk
- Detection leans on pre-use inspection and in-cab monitoring
- One unit down is a production dent, not a stop
Crushers, conveyors, screens
- Few units, each a single point of failure — severity scores run high
- One failure can stop the whole processing line
- Detection leans on condition monitoring — vibration, temperature, wear
- Redundancy and spares strategy are part of the FMEA response
On fixed plant a single high-RPN mode can halt production entirely, so severity dominates; on the mobile fleet, occurrence across many units often tells the louder story. Run FMEA on both, score each in its own context. See how HVI supports mining mobile and fixed assets under one system.
Running itthe FMEA process, step by step
You don't need a consultant to start. Six steps take an asset from blank sheet to a ranked, actionable risk plan.
- 1Pick the asset & break it downList the systems and components that can fail
- 2List failure modes & effectsHow each part fails and what happens downstream
- 3Score S, O, DUse real history for occurrence where you have it
- 4Calculate & rank RPNSort the worksheet high to low
- 5Assign actionsPM, inspection, monitoring or redesign per band
- 6Review & re-scoreUpdate as failures and fixes change the data
Step 6 is what keeps FMEA honest: as corrective actions land and real failures accumulate, re-score and the plan adjusts itself. Book a demo of FMEA-to-PM scheduling that re-ranks as your history grows.
Worksheet to work orderwhere FMEA stops being a spreadsheet and starts preventing failures
An FMEA that lives in a spreadsheet changes nothing. Its value is in becoming scheduled maintenance, targeted inspections and tracked outcomes.
That loop — worksheet to PM task to failure history to a lower re-scored RPN — is the whole point. It's also where a connected maintenance system earns its place over a spreadsheet FMEA that never updates. See work-order and PM task management driven from your FMEA.
From the reliability desk
Our PM schedule had grown by accretion — tasks nobody could justify and gaps nobody had noticed. Running FMEA on the crushing circuit first was a shock: the highest RPN wasn't a flashy failure, it was a bearing mode we had almost no detection on. We added vibration monitoring and a tighter inspection, and that one change probably saved us an unplanned plant stop. Now the schedule follows the RPN, not tradition.
FMEA for mining equipment FAQs
What is FMEA in mining maintenance?
FMEA — failure mode and effects analysis — is a structured method to list how each piece of equipment can fail, score the risk of each failure mode, and prioritize maintenance accordingly. It turns a habit-based PM schedule into a ranked risk plan, applied to both mobile fleet and fixed plant.
How is the RPN calculated?
RPN — risk priority number — is Severity × Occurrence × Detection, each scored 1 to 10, giving a result from 1 to 1000. The higher the RPN, the sooner that failure mode needs attention. Detection is often underrated: a severe, likely, hard-to-catch fault is the most dangerous combination.
Does FMEA differ for fixed plant versus mobile equipment?
Yes. Fixed plant like crushers and conveyors are often single points of failure, so severity scores run high and detection leans on condition monitoring. Mobile fleet failures spread across many identical units, so occurrence is scored from fleet history and detection leans on pre-use inspection.
How does FMEA connect to my PM plan?
Each high-RPN failure mode becomes a maintenance action — a scheduled PM task, a targeted inspection, condition monitoring, or redesign, depending on its band. The output ranks where effort goes, so PM follows risk instead of tradition, and re-scoring as failures accumulate keeps the plan current.
What data do I need to run FMEA well?
Real failure history and defect records are what make occurrence scores credible rather than guesses. Consistent failure codes, per-asset maintenance history and repair records let you score occurrence from evidence and verify later that a corrective action actually lowered the risk.
Build a maintenance plan your FMEA actually drives
HVI gives your FMEA the data it needs and the place its output lives: per-asset failure history for honest occurrence scores, inspection templates built around high-RPN modes, PM tasks triggered from the worksheet, and re-scoring as your history grows. Live in under two weeks.
No credit card · Failure-history reporting from day one
