Four Predictive Maintenance Methods for Auxiliary Equipment: Alignment, Balancing, Oil, Thermography | KEG TRK

Auxiliary equipment — pumps, fans, conveyors, agitators, damper drives — rarely makes headlines until it stops a process. Yet at a typical steel, mining or power site there are 5–10× more auxiliaries than main drives. Four accessible proactive methods cover different failure modes without permanent instrumentation on every unit:

1. Laser alignment — shaft misalignment correction.
2. Field balancing — rotor imbalance correction.
3. Oil analysis — internal gearbox and hydraulic condition.
4. IR thermography — hot contacts, bearings, coolers.

None is universal. Together they close different failure mechanisms and stages of the P-F curve. They complement route SDT ultrasound on bearings and Artesis electrical monitoring on motor fleets — without fixed vibration infrastructure on every asset.

Method–defect–equipment matrix

Failure / cause	Align	Balance	Oil	IR
Coupling misalignment	✅	—	—	△ bearing heat
Rotor/wheel imbalance	—	✅	—	△
Gear tooth wear	△ load	—	✅	△
Oil contamination, water	—	—	✅	—
Poor electrical contact	—	—	—	✅
Bearing lubrication loss	—	—	△	✅
Blocked cooler	—	—	—	✅

△ — indirect or late indicator.

Typical chains by site type

No-spare pump (power, steel)

1. IR every 6 months — bearing and terminal screening.
2. If ΔT > 15 °C — alignment check, lubrication verification.
3. After every coupling change — mandatory laser alignment with report.
4. Gearbox drive (if fitted) — oil analysis every 6 months.

Metallurgical ID fan

1. Seasonal wheel cleaning + balancing.
2. Alignment after foundation overhaul or motor replacement.
3. Bearing thermography in shop walk-down.
4. Oil only if gearbox with oil sump.

GOK conveyor

1. Gearbox oil trending — primary method (dust, shock loads).
2. Alignment after frame impact or coupling swap.
3. Motor/VFD thermography — dust on radiator overheating.
4. Drum balancing when belt vibration confirms imbalance.

Fleet prioritisation: where to start

Step 1. List no-spare assets with downtime cost per hour.

Step 2. Assign at least two methods per class A unit:

• class A/B pumps — thermography + post-repair alignment;
• ID fans — balancing + thermography;
• conveyors — oil + thermography.

Step 3. CMMS triggers: “coupling replaced → alignment work order”; “gearbox overhaul → baseline oil sample”.

Step 4. Quarterly report: prevented failures, documented cases.

See maintenance strategies that cut downtime.

What to avoid

• Duplicate surveys without trending — weekly IR on the same asset adds little; monthly oil on non-critical units is expensive.
• Symptom treatment — bearing swap without alignment repeats failure (see alignment guide).
• Balancing dirty wheels — clean first.
• No before/after records — impossible to audit contractors or train crews.

Budget and ROI

Method	Cost type	Payback
Alignment	Field service, 2–4 h/asset	One prevented pump trip/year
Balancing	Field service, 4–8 h/asset	Extended ID fan bearing life
Oil analysis	Sample + lab	Early gearbox repair vs. crash
Thermography	Walk-down + camera	One prevented fire/panel fault

For a 150–300 auxiliary fleet, combined spend on four methods is usually less than one unplanned outage of a blast furnace gas path or concentrator line.

Integrator role

KEG TRK builds the programme across methods: unified walk-down checklist, finding prioritisation, link to field services (alignment, balancing, thermography) and oil sampling logistics.

Four methods do not compete — they cover different degradation stages. The auxiliary fleet stops being a reliability blind spot when every critical unit has at least two assigned control methods and a clear post-repair rule.

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