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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
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