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Thermographic Testing
VibrotechReliability
ServicesLimited
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What is Thermography?
Infra Red Thermography is a technique for
producing a visible image of invisible (to our eyesinfra red radiation emitted by ob!ects due to theirthermal conditions
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Thermography
"b!ectives of Test
• To detect hot or cold area#s
• To determine absolute temperature
• To vie$ Thermal profiles• To detect temperature loss
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Thermography
Infra Red is part of the
%lectromagnetic
Spectrum
• It travels in straight lines at
the speed of light
• The useful part is divided
bet$een Short and Long
$avelengths
• &se of the correct $avelength
is essential
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Test %quipment
• 'and held portable camera
• attery )o$ered
• "perating at correct$avelength
• Range*++,-./c to 012../c
•
Sensitivity*++.+1/c at 3./c• Real time display
• Image Recording capability
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Why Thermography?
• 4on 5ontact
• Rapid Scanning
• 6ata can be recorded in differing formats
• Images produced are comprehensive 7
reliable
• Is there a viable alternative?
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)rinciples of "peration
• "b!ect radiates infra red radiation
• Temperature difference
• 6ifferences are detected and displayed visually
• %missivity values must be observed
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8dvantages
• 4on 5ontact
• 4on Intrusive
• 5an $or9 at a distance
• :ast and Reliable
•
)ortable• 5onvincing Results
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Limitations
• 4on Intrinsically safe
• There must be a temperature difference for
certain surveys
• "perator e;perience is essential
• :ilters may be needed for certain applications
• Sensitivity and Resolution reduce $ith
distance and angle of vie$
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%lectrical
• S$itch <ear
•
:use bo;es• 5able runs
• %lectrical connectors
• Insulation• Transformers
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=unction o;
22.7°C
43.7°C
25
30
35
40
SP01
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:an
18.7°C
37.4°C
20
25
30
35
AR01
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:use o;
23.3°C
38.1°C
25
30
35
LI01
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%lectrical 5onnections
&sed for the detection of>
•
5orroded connections• Slac9 loose connectors
• 5onnectors at too high an
operating temperature
• 'ot spots
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Transformers
• %lectrical connections
•
Insulators• Thermal profile
• "perating
temperature
• Liquid Level
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Refractory Linings
• Torpedo ladles
• oilers
• :urnaces
• %;hausts
•
6ucting• @ilns
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Rotary @iln , 8ccess 6oor
77.8°C
129.3°C
80
90
100
110
120
SP01
SP02
SP03
SP04
LI01
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@iln , Refractory Lining
22.5°C
48.7°C
25
30
35
40
45
SP01
SP02
SP03
22.6°C
58.5°C
30
40
50
SP01
SP02
SP03
LI01SP04
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Torpedo Ladle
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Steel 5arrying Ladle
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uilding Surveys
&sed to detectA
•
Lac9 of insulation• 5old air infiltration
6raughts
• Boisture traps
• 'ot $arm air escaping
• Structural Integrity
• 'eating 5ooling
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uilding Surveys
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uilding Surveys
BoistureWater Ingress
• Lea9ing Roof
• ridged 5avity
• Lea9ing pipes
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Refinery 7 )etro,5hem
• Vessel Surveys
• loc9ages
• 6efective lagging or
insulation
• Steam traps
• %rosion 5orrosion
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Vessel Surveys
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:lare Stac9s
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)rocess )lant
The above Thermograms sho$ ho$
Thermography can be used as a very fast and
effective maintenance tool+
– The image on the right has a defective cylinder
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)rocess )lant
Thermography may be
used for>
• 5orrosion surveys
• %nsuring valve operation
• Lea9s
• loc9ages
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)rocess )lant
• 'ot spots
• 5old spots (5ryogenics
• 6amaged or missing
insulation
• Tan9 levels
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Biscellaneous
• The detection of
process or
manufacturing faults• 5an be used as a
quality control tool