Industrial Thermography Inspection Services

Thermographic inspection services that identify thermal anomalies, support predictive maintenance, and produce prioritized evidence for maintenance decisions.

Rapid detection of thermal anomalies
Failure prevention and reduced downtime
Maintenance planning by ΔT severity

Request a quote

Industrial thermography inspection services convert a thermal image into a maintenance decision. The objective is not to collect colourful images: it is to identify an abnormal heat pattern, compare it with a relevant operating reference, record the limits of that comparison, and give the maintenance team an action they can schedule. These infrared inspection services suit route-based condition monitoring, focused troubleshooting, and pre-shutdown planning where a contact measurement is impractical or would interrupt production.

A thermographic inspection observes surface radiation. It can reveal heat associated with resistance, friction, heat loss, flow changes, refractory thinning, or an abnormal process state. It cannot see through every material or establish root cause from one image alone. Good industrial thermography inspections therefore combine thermal and visible evidence, asset context, load information, and a comparable baseline before an anomaly becomes a priority. These thermal imaging inspection services are delivered on-site, on operating equipment, with measurement conditions recorded so findings stay comparable from one survey to the next.

Technical guides for inspection planning

Method for industrial thermography inspections

Planning and selection of critical areas and assets. We agree the asset list, process state, safe viewing positions, tag conventions, required access, and the report format before acquisition.
IR and visible acquisition with recorded measurement conditions. Images are captured with the asset identity, operating load where available, camera settings, emissivity assumptions, viewing angle, and relevant reflected-temperature considerations.
ΔT analysis against references. A measured temperature is compared with a like phase, peer component, local baseline, or prior survey made under a comparable condition. The reference is part of the finding, not an afterthought.
Severity classification and intervention priority. We separate urgent abnormal heating from planned corrective work and monitoring items, then state the evidence, uncertainty, and recommended verification for each.
Reporting and follow-up after corrective actions. The thermographic inspection report gives maintenance a traceable work list; a repeat image after repair can confirm whether the abnormal pattern has changed under comparable load.

This method supports an inspection route as well as a one-off investigation. Repeatability matters: the same asset, a similar viewpoint, a meaningful operating state, and a retained baseline make trend comparison more useful than an isolated temperature value. Where conditions are not comparable, the report records that limitation instead of implying a precise trend.

ΔT severity classes and priorities are documented with the selected reference and the conditions observed during the survey.

Scope and use cases for thermographic inspection

Motors, bearings, couplings, and drives. Elevated bearing housings, uneven motor temperatures, hot couplings, and belt or gearbox patterns can indicate a need to investigate lubrication, alignment, load, cooling, or wear. Infrared inspection services show the external thermal symptom. Vibration analysis, lubrication records, and mechanical inspection may still be needed to identify the mechanism.

Electrical equipment. Busbars, lugs, breakers, contactors, fuses, cables, and motor control centres can develop resistance heating under load. For panels and switchgear, see our dedicated electrical-panel thermography service, which addresses safe access, phase comparisons, and IR-window workflows.

Refractory, furnaces, and hot process vessels. A hot area on an external shell may indicate changing refractory condition, insulation loss, or a process-temperature difference. The interpretation depends on shell construction, emissivity, process state, ambient conditions, and prior baseline. A hot zone is a reason to assess the equipment and plan scope; it is not by itself a wall-thickness or remaining-life measurement.

Piping, insulation, steam systems, and heat exchangers. Thermal patterns can locate insulation losses, abnormal distribution, possible blocked or leaking flow paths, and areas that warrant further examination. For pipe-wall questions, read our guides to infrared pipe corrosion detection and non-contact pipe thickness monitoring at high temperature. These methods require careful correlation with process data and, where necessary, a suitable NDT method.

Process equipment. Dryers, moulds, reactors, heat exchangers, conveyors, rotating lines, and cooling circuits can be assessed for heat-flow changes that merit process or maintenance review. The survey can be timed around operating recipes, known fault windows, or a baseline production state so images answer a specific operational question.

Emissivity, reflected radiation, surface finish, viewing angle, atmospheric path, focus, distance, and load all affect interpretation. A polished metal surface can mostly reflect its surroundings; an idle motor may hide a load-related pattern; a changed recipe may invalidate comparison with an old image. An anomaly therefore does not equal a certain defect. We state the observed thermal pattern, its comparison basis, the caveats, and the next action needed to reduce uncertainty.

What you receive from infrared inspection services

A prioritized anomaly register with asset identifiers, locations, inspection date, and recommended action timing.
Thermal and visible images referenced to the inspected asset, with measurement points, temperature observations, and the selected comparison reference.
Documented ΔT severity classes: immediate attention, planned correction, monitoring, or no action at the surveyed condition, tailored to the asset context rather than treated as an automatic failure prediction.
Recommended corrective or verification actions, such as electrical inspection, mechanical checks, insulation review, process-data correlation, or a repeat survey after repair.
A report narrative covering operating conditions, emissivity and reflection assumptions where relevant, access limits, baseline availability, and findings that need follow-up before a diagnosis is made.

The useful output is a work-ready decision record. Maintenance teams can filter the register by severity, unit, asset class, or shutdown opportunity; reliability teams can retain the images as a comparable baseline; and managers can see what was observed, what was not established, and which action is proportionate. Urgent observations are escalated through the agreed site contact. Formal report timing is agreed with the survey scope and follows review of the evidence rather than a promise based only on image capture.

Standards and method references

Industrial thermography inspection programmes can be structured with the condition-monitoring guidance in ISO 18434-1, which addresses thermography for condition monitoring and diagnostics of machines. The broader condition-monitoring framework in ISO 17359 helps frame asset selection, data collection, analysis, and maintenance decision-making.

ISO 9712 is a personnel qualification framework for non-destructive testing. It does not by itself validate a site finding, determine an asset’s remaining life, or replace the duty holder’s maintenance decisions. Method selection, safe access, asset context, and evidence review remain part of each thermographic inspection.

When thermography is not enough

Passive industrial thermography reads the heat already present at a surface. It may be insufficient when the target is concealed, the temperature contrast is too low, the surface is highly reflective, or the question concerns a subsurface feature that needs controlled excitation. In those cases, stimulated thermographic inspection under EN 16714 may be the more appropriate approach, subject to the material, geometry, access, and inspection objective.

When the requirement is recurring or part-specific — an inline monitoring station, a combined thermal and high-speed imaging setup, or an inspection cell for one component family — we design custom thermal imaging solutions around the same measurement discipline.

Welding applications also need a method matched to the decision. Thermal evidence during production can support process control and traceability, while high-speed visual evidence may answer a different question about the weld pool. See welding monitoring for the monitoring context and thermography methods for weld inspection for a comparison of passive and active approaches. Need to define a route, asset scope, or report format? Contact Therness to discuss the inspection objective before the survey is planned.

FAQ

How often should industrial thermography inspections be performed?

A common starting point is an annual route. Critical assets, equipment with a poor history, and assets whose load or duty changes materially may need a shorter interval. The useful interval is one that produces comparable baseline surveys and gives maintenance time to act on trends.

Do we need to stop the plant for a thermographic inspection?

Usually not. Passive thermography is normally most useful while equipment is operating under a meaningful, safe load. Access, permits, guards, electrical safety rules, and site procedures still govern the survey; an unsafe viewing position is not inspected live.

How accurate is an infrared temperature measurement?

A radiometric camera measures emitted infrared energy, not a defect directly. Emissivity, reflected temperature, distance, viewing angle, focus, atmosphere, and load affect the result. For condition monitoring, comparison with like components under comparable conditions and repeatable baselines is often more decision-useful than a single absolute temperature.

How is ΔT severity defined?

ΔT is evaluated against an appropriate reference: a similar phase, peer component, local baseline, or prior survey under comparable load. The report assigns a practical severity class and action priority, while recording the reference and measurement conditions used.

When is the thermography report available?

Timing is agreed during planning. Urgent findings can be communicated through the site contact during or immediately after the survey; the formal report follows the review of images, asset references, temperatures, conditions, and recommended actions.

Does a hot area prove that a component has failed?

No. A thermal anomaly is evidence to investigate, not automatic proof of a specific defect. Load, emissivity, reflected radiation, process state, insulation condition, and the selected reference can change the image. The report distinguishes the observation, its limits, and the recommended verification.

What severity classes are included in the report?

Reports use documented ΔT-based severity classes and priorities such as immediate attention, planned correction, monitoring, or no action at the surveyed condition. The class is tied to the asset context and comparison reference rather than presented as a universal failure prediction.

Can thermography inspect equipment that cannot be contacted safely?

Often, yes. The method is non-contact and can be useful on rotating, hot, energised, or inaccessible assets when a safe line of sight exists. It does not remove the need for site access controls, permits, and safe operating conditions.

What is included in thermal imaging inspection services?

Survey planning against an agreed asset list, on-site infrared and visible acquisition with recorded measurement conditions, ΔT analysis against a documented reference, severity classification, and a prioritized report the maintenance team can schedule from. Scope is tailored to the site rather than sold as a fixed package.

Can Therness develop a custom thermal imaging solution for a specific application?

Yes. Beyond route surveys, Therness scopes custom thermal imaging and monitoring solutions: feasibility studies on representative parts, combined thermal and high-speed imaging systems, and permanently installed monitoring stations. See the custom thermal imaging solutions service page for how a project is scoped.

Which assets are covered by infrared thermography inspection services?

Typical routes cover electrical distribution, motors and rotating machinery, refractory and insulation, steam systems, piping, and process equipment. Where an asset cannot be assessed passively, an active thermography approach can be proposed instead.