Preventive industrial maintenance: strategies to improve efficiency, reduce failures and extend equipment life

A guide to moving from isolated interventions to a plan built around criticality, documentation and results: what to prioritize, how to measure and how to coordinate work safely.

AMAR Colombia · 2026-10-14

Illustration of a professional documenting an inspection beside closed switchboards in an electrical room — Editorial illustration created for this guide. It does not depict a specific AMAR project or employee.

01 / Continuity starts before failure

Equipment that still runs is not necessarily in good condition. An unresolved anomaly, incomplete documentation or a hard-to-source part can turn a minor outage into a production problem. Preventive maintenance organizes attention to these risks before they force improvised responses.

The goal is not more intervention, but purposeful intervention. Each task should address a failure mode, produce useful evidence and lead to a clear decision: continue, monitor, schedule a correction or escalate the finding. A signed checklist without acceptance criteria does not demonstrate operational readiness.

02 / What preventive maintenance means

It is a scheduled care strategy triggered by time, usage or operating cycles. Its scope may include documentation reviews, inspections and activities specified in the manufacturer's manual. The program connects the asset inventory with owners, resources and closure evidence.

A useful task has five elements

An identified asset and defined scope.
An approved method and competent personnel.
Safety conditions and coordination with operations.
Acceptance criteria drawn from applicable documentation.
A result record and an action for any deviation.

03 / Preventive, corrective and predictive

The strategies complement each other. Corrective maintenance responds to failure; preventive maintenance schedules tasks by calendar or use; predictive maintenance uses changes in condition to guide intervention. The choice depends on the asset and available information, not on which term sounds more modern.

Maintenance strategy comparison
Strategy	Trigger	Application criterion
Corrective	Failure or loss of function	Define contingency and consequences before accepting run-to-failure.
Preventive	Time, hours or cycles	Schedule tasks justified by the manual and documented experience.
Predictive / condition-based	A meaningful trend or condition	Requires comparable measurements, interpretation and the ability to act.

04 / Benefits you can evaluate

A coherent program makes coordination between operations, maintenance and procurement more predictable. It identifies overdue work, findings that need attention and resources required for a work window. Improvement is demonstrated through your own records, not universal savings percentages.

The measure of a good plan is not how many tasks it contains, but how many evidence-based decisions it enables.

Compare equivalent periods: the same asset family, similar loading and consistent failure-recording rules. If the measurement boundary changes, document the change before attributing improvement to the program.

05 / Identify critical equipment

Start with the consequences of losing the equipment's function. Consider safety, process continuity, quality, the environment and recovery time. A small asset without backup may deserve more attention than an expensive asset with genuine redundancy.

Which process depends on the asset and how long can it tolerate unavailability?
Is there proven backup and can it be used under current conditions?
Which anomalies have recurred and what information is missing?
How long does it take to obtain a spare or coordinate assistance?

06 / Build an executable plan

Inventory: identifier, location, function, reference and current documentation.
Connect each task to the risk it controls and its approved method.
Define resources: personnel, permits, spares, instruments and work window.
Assign an owner, initial frequency and acceptance criteria.
Record findings, evidence and actions before closing the work order.
Review the plan using accumulated experience and operating changes.

Practical example: a distribution switchboard

Illustrative planning template; it does not prescribe universal intervals
Activity	When to define it	Closure evidence
Review inventory and drawings	When establishing the plan and after modifications	Confirmed identifier and document version
Document condition and findings	In the agreed window based on risk and manual	Record, comparison and owner of each action
Prepare specialist intervention	For findings or justified scheduled work	Approved permits, method, resources and criteria
Review program effectiveness	At the review cycle agreed by the team	Closed actions and documented adjustments

The template illustrates organization; it is not an instruction to open or service the switchboard. Switching, tests and parameters must be defined for the installed reference by competent personnel using applicable procedures.

07 / Frequency and prioritization

There is no single interval for all equipment. Establish the starting point from the specific reference's manual, duty, environment, history and applicable requirements. Distinguish routine inspection, specialist testing and intervention: they are not interchangeable.

Increase attention when meaningful signals emerge or conditions change; do not reduce tasks merely because no recent failure occurred. Extending intervals requires comparable evidence and technical approval. Consult the manufacturer's specific instructions before changing the program.

08 / MTBF, MTTR and availability

MTBF relates observed operating time to failures of repairable assets. MTTR expresses the average repair time defined in your records. Document what that time includes: diagnosis, waiting for spares and restoring service may be measured differently. Do not compare indicators with different boundaries.

For observed availability, record available time and total required time over the same window. The approximation MTBF / (MTBF + MTTR) describes inherent availability under simplified assumptions: it is not itself operational availability when logistical delays, planned outages or other losses are present.

09 / Safety as a condition of the work

Before intervention, the organization must identify hazardous energy, define authorized personnel and coordinate the energy-control procedure. Stopped machinery may retain stored energy. Permits, training and the verification required by the procedure cannot be replaced by informal observation.

10 / Mistakes that weaken the program

Copying intervals without checking the equipment reference and environment.
Closing an order because the asset was visited, without documenting the result.
Using different names for the same failure and losing traceability.
Scheduling work without spares, permits or a real intervention window.
Counting completed tasks without reviewing open findings or recurring failures.

A useful review meeting ends with decisions: what will be corrected, who owns it, which date is feasible and what evidence demonstrates closure. Keeping records concise and consistent is often more useful than expanding forms that nobody completes.

11 / Digitalize without losing engineering judgment

A maintenance management system can centralize assets, work orders and history. Start with unique identifiers and consistent categories. A sensor or dashboard does not solve an incomplete chain: signal, interpretation, decision and action need owners.

Avoid recording isolated values alone. Save context: load, environment, date, instrument and method. This helps distinguish a trend from a measurement taken under different conditions. Monitoring should support reviewable decisions rather than create alarms the team eventually ignores.

AMAR-supplied photographs of transformer work and switchboard review — Photographic material supplied by AMAR Colombia. Activities must follow the procedures and controls defined for each intervention.

12 / A first improvement cycle

Select an equipment family, confirm its inventory and review recent work orders. Identify recurring findings and documentation gaps. Then agree a concise plan with operations: justified tasks, available resources and closure criteria. At the end of the cycle, assess which decisions the records enabled and what information remains missing.

Preventive maintenance improves when it stops being a separate schedule and becomes a shared approach to caring for operations. Continuity depends as much on the technical quality of the intervention as on preparing, documenting and closing work properly.

Frequently asked questions

How often should maintenance be performed?

It depends on equipment, environment, duty and criticality. Use the installed reference's documentation and review the program using evidence. This guide does not prescribe an interval for every asset.

Does predictive maintenance replace preventive maintenance?

Not necessarily. Scheduled tasks and condition monitoring can coexist. Monitoring requires comparable data, technical interpretation and a process for responding to deviations.

What should be measured first?

Start with asset identification, operating hours, failures, repair time and open actions. Define each field before calculating indicators.

Are these references Colombian regulations?

International references provide concepts and technical documentation; they do not replace local requirements or manufacturer instructions. Regulatory applicability must be determined for the specific project and activity.

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Maintenance · Reliability · Safety · Switchboards · Digitalization