Borescope inspection is a condition monitoring technique that uses a slender optical or video probe inserted through an access port to visually examine the inside of equipment, gearboxes, turbines, heat exchangers, pipes, cylinders, without taking anything apart. It answers the question every planner wants answered before a teardown: what does it actually look like in there?
Modern industrial units are video borescopes: a camera chip at the tip of a flexible insertion tube, LED lighting, and articulation controls that steer the tip. Diameters run from a couple of millimeters for fuel nozzles up to ten or more for tank and vessel work. Rigid scopes remain useful for straight, short access; flexible videoscopes dominate general plant work because they navigate bends and record images for the asset file.
A critical extruder gearbox shows rising iron in its oil sample. The traditional answer is a precautionary teardown: two shifts of work, 16 technician hours, plus 12 hours of line downtime. At 2,500 per downtime hour that is a 30,000 decision made on indirect evidence. A borescope inspection through the inspection cover takes 45 minutes during a planned break: it finds light micropitting on two intermediate gear teeth, no spalling, no debris dam. The team schedules a bearing and oil change into the next planned shutdown six weeks out and re-scopes monthly until then. The teardown happens once, planned, with parts staged, instead of immediately and blind.
The skill is less in driving the probe and more in interpretation: distinguishing cosmetic staining from active corrosion, micropitting from destructive macropitting, and normal contact patterns from misalignment wear. Teams build that skill fastest by saving annotated images into the asset history on every inspection, so each new scope has the last one as a baseline. A photo time series of the same gear tooth is worth more than any single perfect image.
A borescope only sees surfaces with line of sight from an access point, and it inspects a moment in time. It complements rather than replaces continuous techniques: vibration analysis and oil analysis flag that something changed; airborne ultrasound catches leaks and electrical faults; the scope then converts those signals into visual certainty before money is spent. That layered approach is the core of a sound condition monitoring program.
Ad hoc scoping produces images on someone’s phone and knowledge in someone’s head. The disciplined version: inspection points and access ports listed per asset, scope inspections scheduled as recurring work orders on critical gearboxes and exchangers, findings graded against defined acceptance criteria, and every image attached to the asset record with date and operating context.
Fabrico does not look inside your gearbox; it makes sure somebody does, on schedule, and that what they saw is never lost. Recurring borescope routes run as CMMS work orders with photo attachments in the asset history, findings turn into planned corrective work with parts reserved, and real-time OEE quantifies the downtime avoided when teardowns become planned events. EU-built, with EU data residency.
Any existing opening reaching the area of interest: inspection covers, drain or fill ports, spark plug or injector holes, or purpose-drilled and plugged access points added during design or overhaul. Planning access ports into critical equipment is a cheap gift to future maintainers.
Generally no for internals of geared or reciprocating machines, inspection requires the machine stopped and isolated, with lockout applied. The value is that stopping for an hour of scoping is far cheaper than stopping for days of teardown.
Driven by criticality and history: a common pattern is annually as baseline, tightening to monthly when oil analysis or vibration flags a developing issue, and always before deciding on a major teardown.
Want inspection photos, oil results, and downtime history living on the same asset record? Book a Fabrico demo to see a field-ready CMMS and real-time OEE close the loop on condition monitoring.
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