Unplanned downtime rarely arrives at a convenient moment.
A production line stops.
A component begins behaving differently.
A maintenance team suspects something is wrong internally but cannot see the area without opening or dismantling the equipment.
At that point, the cost of the problem is no longer limited to the component.
Production, labour, schedules, customer commitments and maintenance resources can all be affected.
Inspection cannot prevent every failure.
But better access to information can help engineering and maintenance teams understand what is happening earlier and make more informed decisions about what should happen next.
Downtime is rarely just a maintenance cost
When a piece of production equipment stops unexpectedly, the obvious cost is the repair.
But the wider impact can be much greater.
Depending on the operation, unplanned downtime may also involve:
- lost production;
- operators waiting for equipment to return to service;
- maintenance labour being redirected unexpectedly;
- production schedules being changed;
- additional overtime;
- delayed customer orders;
- scrapped or unfinished components; and
- pressure to diagnose the problem quickly.
That is why understanding condition before a complete failure can be so valuable.
The challenge is often access
Many important components are difficult to inspect directly.
The area of interest may be inside:
- an engine;
- a gearbox;
- a turbine;
- a casting;
- a vessel;
- pipework;
- a heat exchanger;
- machinery; or
- another enclosed assembly.
The problem may be visible if the equipment is dismantled.
But dismantling takes time and may itself create additional work.
Remote visual inspection provides another option: look inside first.
What can an industrial videoscope help investigate?
A videoscope allows a small camera and probe to be guided into areas that cannot easily be viewed directly.
Depending on the component and application, this can help teams investigate features such as:
- surface damage;
- cracking;
- wear;
- corrosion;
- deposits or contamination;
- foreign material;
- deformation;
- manufacturing defects; and
- general internal condition.
The inspection does not automatically determine the engineering response.
It gives the people making that decision information from an area that would otherwise be difficult to assess.
Earlier information can change the maintenance decision
Imagine a machine begins producing an unusual vibration, temperature change or performance trend.
Those symptoms may indicate a developing problem, but they do not necessarily identify the cause.
If an accessible internal area can be visually inspected, the maintenance team may be able to gather more evidence before deciding whether the equipment needs to be dismantled immediately.
The result may show that further intervention is required.
It may show that the equipment can remain in service while work is planned.
Or it may indicate that the suspected area is not the source of the problem at all.
Each of those outcomes is useful because the decision is being made with more information.
Planned maintenance is easier to manage than an unexpected failure
There is an important operational difference between identifying work that needs to be scheduled and discovering the same problem after the equipment has already stopped.
Planned maintenance gives the business more control.
Parts can be arranged.
People can be scheduled.
Production can be adjusted.
Access equipment can be prepared.
The work can potentially be coordinated with an existing shutdown or maintenance window.
None of those advantages guarantees that disruption disappears.
But they can make the disruption easier to manage.
Inspection can also prevent unnecessary strip-down
The opposite situation matters too.
Not every suspected internal problem ultimately requires complete dismantling.
If the only way to establish condition is to strip the component, maintenance teams may end up carrying out significant work simply to discover what is inside.
A remote visual inspection can provide an initial assessment before that decision is made.
Where the inspection provides enough evidence, unnecessary strip-down may be avoided.
Where it confirms that further work is needed, the team goes into that work with a better understanding of what they are likely to find.
Seeing a feature is not always enough
Some inspections require more than visual confirmation.
An engineer may identify a mark, area of damage or internal feature but still need to understand its size or depth.
This is where measurement-capable videoscopes can add another layer of information.
For example, the Realta 3D Measurement Videoscope can support functions such as point-to-point measurement, depth measurement, area measurement and 3D surface profiling.
That can help move the inspection from: “There is something here.”
towards: “This is what we can see and these are the dimensions we can measure.”
Condition monitoring needs useful evidence
Not every internal feature requires immediate intervention.
In some applications, engineering teams may decide to monitor a known area over time.
For that approach to be useful, inspections need to provide consistent and comparable information.
That may involve recording:
- the location of the feature;
- its appearance;
- relevant measurements;
- images or video; and
- the date and inspection conditions.
Later inspections can then provide additional evidence about whether the condition appears stable or has changed.
The videoscope does not replace the engineering criteria used to determine acceptable condition.
It helps provide the visual information those decisions may rely on.
Image quality matters because somebody has to interpret it
A remote inspection is only useful if the resulting image allows the relevant feature to be assessed.
That means image quality should not be considered only as a marketing specification.
The practical questions are:
- Can the operator clearly see the surface?
- Can a suspected defect be distinguished from reflections or contamination?
- Is the lighting appropriate?
- Can the camera be positioned at a useful angle?
- Can the image be captured or recorded for later review?
The better the information available to the engineer, the more useful the inspection becomes.
Probe access can matter more than headline specification
A highly capable videoscope is of limited value if the probe cannot physically reach the inspection area.
Industrial inspection therefore needs to consider:
- access opening size;
- probe diameter;
- probe length;
- bends and internal geometry;
- required viewing direction;
- articulation; and
- the distance between the camera and the inspection surface.
This is why equipment should be specified around the actual component rather than simply by choosing the system with the highest specification.
Articulation becomes important inside complex components
Getting the camera into the component is only the first challenge.
The operator also needs to direct the view towards the area of interest.
Inside complex machinery, the required surface may not be directly in front of the probe.
Good articulation allows the camera tip to be steered around internal geometry and positioned more effectively.
That can reduce the need to repeatedly remove and reinsert the probe while trying to find the correct viewing angle.
Inspection should support maintenance, not create another process
There is little value in adding an inspection step simply because the technology exists.
The inspection needs to answer a useful maintenance or engineering question.
For example:
- Is there visible internal damage?
- Does this component need to be removed now?
- Can we obtain enough information to plan the work?
- Has a known feature changed?
- Is further NDT or physical inspection required?
- Can the suspected area be ruled out?
When the inspection is built around a real decision, the value becomes much clearer.
Remote visual inspection has limitations
It is important not to overstate what a videoscope can do.
Remote visual inspection does not replace every other inspection technique.
Some conditions may require ultrasonic testing, radiography, dye penetrant, magnetic particle inspection, dimensional metrology, destructive testing or direct physical access.
A videoscope also only shows surfaces the camera can reach and view.
The value comes from using remote visual inspection where visual evidence can help answer the engineering question.
The best time to inspect is not always after failure
Inspection is often associated with diagnosing something that has already stopped working.
That will always be an important use.
But remote visual inspection can also be incorporated into planned maintenance, quality control and condition assessment before a complete failure occurs.
That is where the relationship with downtime becomes particularly interesting.
If a developing condition can be identified early enough to move maintenance into a controlled window, the inspection may have helped the business avoid a much more disruptive event later.
It will not happen on every inspection.
But the potential value is significant where production downtime is expensive.
Test the equipment on the actual component
Industrial inspection applications can be highly specific.
A probe that works perfectly in one engine, casting or machine may not suit another.
For that reason, the most useful equipment demonstration is often one carried out on the customer's real component.
Can the probe reach the inspection point?
Can the camera articulate into the required position?
Is the image useful?
Can the required feature be measured?
Can the operator perform the inspection efficiently?
Those answers are more useful than simply comparing specifications on paper.
Better information can support better uptime decisions
No inspection system can guarantee that manufacturing equipment will never fail.
That is not a realistic promise.
What inspection can do is help engineering and maintenance teams understand internal condition without automatically moving straight to dismantling.
Sometimes that will confirm that urgent work is required.
Sometimes it will help move maintenance into a planned window.
Sometimes it may show that unnecessary strip-down can be avoided.
In every case, the value comes from having better information before making the next decision.
And when unexpected downtime is expensive, better information can be extremely valuable.
Industrial inspection from Rausch UK
Rausch UK supplies industrial videoscope and remote visual inspection technology for manufacturing, engineering, maintenance and quality-control applications.
If you have an internal inspection challenge, we can demonstrate the relevant equipment using your own component or inspection application.
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