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Thermographic Testing. Vibrotech Reliability Services Limited. What is Thermography?. Infra Red Thermography is a technique for producing a visible image of invisible (to our eyes) infra red radiation emitted by objects due to their thermal conditions. Thermography. Objectives of Test

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Thermographic testing
Thermographic Testing

Vibrotech

Reliability

Services

Limited


What is thermography
What is Thermography?

Infra Red Thermography is a technique for producing a visible image of invisible (to our eyes) infra red radiation emitted by objects due to their thermal conditions


Thermography
Thermography

Objectives of Test

  • To detect hot or cold area’s

  • To determine absolute temperature

  • To view Thermal profiles

  • To detect temperature loss


Thermography1
Thermography

Infra Red is part of the Electromagnetic Spectrum

  • It travels in straight lines at the speed of light

  • The useful part is divided between Short and Long wavelengths

  • Use of the correct wavelength is essential


Test equipment
Test Equipment

  • Hand held portable camera

  • Battery Powered

  • Operating at correct wavelength

  • Range…..-20°c to +1500°c

  • Sensitivity…..0.1°c at 30°c

  • Real time display

  • Image Recording capability


Why thermography
Why Thermography?

  • Non Contact

  • Rapid Scanning

  • Data can be recorded in differing formats

  • Images produced are comprehensive & reliable

  • Is there a viable alternative?


Principles of operation
Principles of Operation

  • Object radiates infra red radiation

  • Temperature difference

  • Differences are detected and displayed visually

  • Emissivity values must be observed


Advantages
Advantages

  • Non Contact

  • Non Intrusive

  • Can work at a distance

  • Fast and Reliable

  • Portable

  • Convincing Results


Limitations
Limitations

  • Non Intrinsically safe

  • There must be a temperature difference for certain surveys

  • Operator experience is essential

  • Filters may be needed for certain applications

  • Sensitivity and Resolution reduce with distance and angle of view


Electrical
Electrical

  • Switch Gear

  • Fuse boxes

  • Cable runs

  • Electrical connectors

  • Insulation

  • Transformers





Electrical connections
Electrical Connections

Used for the detection of;

  • Corroded connections

  • Slack / loose connectors

  • Connectors at too high an operating temperature

  • Hot spots


Transformers
Transformers

  • Electrical connections

  • Insulators

  • Thermal profile

  • Operating temperature

  • Liquid Level


Refractory linings
Refractory Linings

  • Torpedo ladles

  • Boilers

  • Furnaces

  • Exhausts

  • Ducting

  • Kilns






Building surveys
Building Surveys

Used to detect,

  • Lack of insulation

  • Cold air infiltration Draughts

  • Moisture traps

  • Hot / warm air escaping

  • Structural Integrity

  • Heating / Cooling



Building surveys2
Building Surveys

Moisture/Water Ingress

  • Leaking Roof

  • Bridged Cavity

  • Leaking pipes


Refinery petro chem
Refinery & Petro-Chem

  • Vessel Surveys

  • Blockages

  • Defective lagging or insulation

  • Steam traps

  • Erosion / Corrosion




Process plant
Process Plant

The above Thermograms show how Thermography can be used as a very fast and effective maintenance tool.

  • The image on the right has a defective cylinder


Process plant1
Process Plant

Thermography may be used for;

  • Corrosion surveys

  • Ensuring valve operation

  • Leaks

  • Blockages


Process plant2
Process Plant

  • Hot spots

  • Cold spots (Cryogenics)

  • Damaged or missing insulation

  • Tank levels


Miscellaneous
Miscellaneous

  • The detection of process or manufacturing faults

  • Can be used as a quality control tool