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Case study · Industrial equipment

Fix machines before they stop the line

Unplanned breakdowns are the most expensive kind of maintenance. This is how we used sensor data and machine learning to detect abnormal behaviour early and raise maintenance work before failure, starting with the assets where downtime costs most.

Project overview

Condition-based and predictive maintenance.

Industry
Industrial equipment
Client
Confidential
Solution
Predictive maintenance
Platform
Azure IoT + ML
Timeline
12–20 weeks
Team
3 people
Signals
Vibration, temperature, current
Output
Alerts and work orders
Starting scope
Most critical assets

Expected business outcomes

What the client set out to achieve

Results depend on sensor coverage and failure history.

  • 20–40% Fewer unplanned stoppages

    Developing faults detected days or weeks ahead.

    Target range for covered assets; depends on failure modes

  • Earlier Warning of developing faults

    Anomalies flagged when behaviour drifts from normal.

    Lead time measured per failure mode

  • Tracked False alarm rate

    Alerts reviewed with engineers to keep false alarms low.

    Threshold agreed with maintenance

Business challenges

Where the client started

Maintenance is either scheduled or reactive, rarely based on condition.

Maintenance

Time-based schedules and repairs after failure.

Sensors

Some sensors installed, data rarely analysed.

History

Failure records in the maintenance system, often incomplete.

Engineers

Experienced engineers hear problems before systems do.

Cost

A single unplanned stop can cost more than the whole project.

Proposed solution

What the build covers

Simple, explainable models first, more advanced ones where data allows.

  • Sensor ingestion

    Sensor data collected and stored with asset context.

  • Anomaly detection

    Models learn normal behaviour per asset and flag deviations.

  • Failure prediction

    Where failure history exists, models estimate time to failure.

  • Engineer dashboard

    Asset health with the signals behind each alert.

  • Work orders

    Confirmed alerts create maintenance work orders.

  • Feedback loop

    Engineers label alerts, improving the models.

Project requirements

What the client asked us for

The request was to predict failures. We start with anomaly detection on the most critical assets, because it needs little failure history and gives engineers early warnings quickly.

Engineers review every alert at first; their feedback is what makes the models useful.

What the project had to deliver

  • 01Early warning on critical assets
  • 02Explainable alerts
  • 03Work orders from confirmed alerts
  • 04Engineers in the loop

Key challenges & considerations

What made it harder, and what we did

  1. Few recorded failures to learn from

    What we did

    The project started with anomaly detection, which needs no failure history.

  2. Sensors missing on older equipment

    What we did

    Sensors were added only where the pilot showed value.

  3. Data connectivity in plants

    What we did

    Data was buffered at the edge, so gaps in plant connectivity lost nothing.

  4. Alert fatigue if thresholds are wrong

    What we did

    Thresholds were tuned with the maintenance engineers to keep false alarms low.

What we watched for

  • Start with anomaly detection
  • Keep engineers reviewing alerts
  • Tune for low false alarms
  • Expand only after proving value

Development process

Critical assets first

Value is proven on a small set of assets.

  1. Stage 1

    Asset selection

    Critical assets chosen by downtime cost.

  2. Stage 2

    Data

    Sensor data connected and cleaned.

  3. Stage 3

    Models

    Anomaly models built and tuned with engineers.

  4. Stage 4

    Alerts and work orders

    Alerts connected to the maintenance system.

  5. Stage 5

    Expand

    More assets and failure prediction where history allows.

Technology stack

IoT and ML on Azure

Edge collection, cloud models, maintenance system integration.

IoT

  • Azure IoT Hub
  • Edge gateways

Machine learning

  • Azure Machine Learning
  • Anomaly detection models

Data

  • Time-series storage
  • Fabric

Integration

  • Maintenance system / D365 Asset Management

Quality assurance & deployment

Measured against a test set before launch

AI quality was measured, not judged from a demo. A test set of real examples with agreed answers decided whether the system was ready, and the same set was re-run after every change.

  • A test set of real examples with agreed answers
  • Accuracy thresholds agreed with the business before launch
  • Safety checks: refusals, permissions and prompt-injection tests
  • A person reviewing low-confidence output
  • Cost and response time measured at real volumes

Deployment

  • 01Alerts and work ordersAlerts connected to the maintenance system.
  • 02ExpandMore assets and failure prediction where history allows.
  • 03Pilot, then staged rolloutA small group of real users first, with results reviewed weekly before widening access.
  • 04Monitoring and warrantyAccuracy, drift, usage and cost tracked after launch, and six months of free bug fixing.

Final deliverables

Maintenance guided by condition

Engineers see early warnings on critical assets with the signals behind them, and confirmed alerts become planned work before failure.

Every reviewed alert improves the models.

  • Asset health monitoring
  • Early fault warnings
  • Work orders from alerts
  • Continuous improvement

Handed over to the client

  • 01Production AI serviceDeployed in the client's own cloud tenant
  • 02Source code and modelsIn a repository the client can access
  • 03Test set and resultsThe evidence behind the launch decision
  • 04MonitoringAccuracy, usage and cost
  • 05Six-month warrantyFree bug fixing after delivery

Success metrics

How success is measured

MeasureOutcomeHow it is measured
Fewer unplanned stoppages 20–40% Target range for covered assets; depends on failure modes
Warning of developing faults Earlier Lead time measured per failure mode
False alarm rate Tracked Threshold agreed with maintenance

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