Equipment Reliability

Repair or Replace the Machine?

A machine has recurring failures, rising maintenance cost, poor performance, obsolete parts, or a proposed replacement, but the decision is not evidence-based.

Engineering decision

Compare restoration, redesign, monitoring, partial upgrade, and replacement against consequence, condition, operating need, supportability, cost, and verification criteria.

Preserve first

Evidence worth collecting before the condition changes

Failure frequency and production consequence
Condition of major assemblies and interfaces
Maintenance/spares cost and lead time
Required capacity, quality, safety, and utility performance
Replacement cost, installation interfaces, commissioning needs, and expected life

Separate the explanations

Questions that improve the diagnosis

What operating requirement is the current machine failing to meet?
Can the dominant failure mechanism be economically corrected?
What new risks or interfaces come with replacement?
How will success be accepted and verified after the decision?

Avoid premature action

What not to conclude too early

Replacing equipment because one component failed
Comparing purchase price without installation, downtime, spares, training, and lifecycle implications
Assuming a newer machine automatically solves an operating-system problem