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7/28/12
Applications of InfraredThermography
Tahir Hussain
Sr. Scientist, DNPER
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Infrared Thermography
In 1800 Sir Frederick William Haerschel whileworking on thermal difference betweendifferent light colors discovered that
temperature increased from red to violet butthe temperature just beyond red portion washighest of all
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Infrared Thermography (contd.)
Any object that has a temperature aboveabsolute zero (-273.15oC) emits infraredradiations
The warmer the object, the more infraredradiation it emits
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Infrared Thermography (contd.)
Our eyes can only detect electromagneticradiations of ranging from 400m to 700m, allother form of electromagnetic radiations such
as infrared are invisible to human eye though itcontain very useful information
Infrared thermography is the science ofacquisition and analysis of thermal information
(infrared radiation)It is like infrared to visible range translation
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The Infrared Camera
The infrared energy coming from an object isfocused by the optics onto and infrareddetector
The detector sends the information to sensorelectronics for image processing
The electronics translate the data comingfrom the detector into an image that can be
viewed in the view finder or on a standardvideo monitor or LCD screen
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Applications ofInfrared
ThermographyCondition Monitoring
Research and Development
Medical and veterinary
Quality control and process monitoring
Non-destructive testing
Security Systems
And many others!
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Condition Monitoring
Mechanical, friction
Electrical maintenance
Furnaces and boilers
Fluid flow problems
Tanks and vessels
Building Diagnostics
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,
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. C
. C
, C
, C
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Motors
Bearing problems
*> . C
*< . C
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Image of tailbearings from twomotors underidenticaloperatingconditions clearly
indicating potentialproblem
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Electric Motor Bearing
Overheated motorbearing Over 80 C on
bearing housing
, C
, C
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Pumps
*> . C
*< . C
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*> . C
*< . C
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Two Reciprocating PistonPumps under similar loads
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Pumps
, C
, C
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Pump bearing
Pump bearing in needof maintenance.
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Bearings
Shaft misalignment and lack of lubricationcan cause excessive heating
*> . C
*< . C
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*> . C
*< . C
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Normal operating bearingin motor/coupling set
Shaft heating indicates internalproblem, likely a bad bearing
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Bearings
*> . C
*< . C
.111
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*> . C
*< . C
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Image of two identical bearings in a hoist clearly indicatea thermal anomaly
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Some more Examples of
Mechanical Friction
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Electrical Motor Windings
Overheated windings
*> . C
*< . C
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Clear temperature differences on distant motor (operating underidentical conditions as second motor) imply winding issues
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Electrical Motor Windings
Example of short circuit in the field winding
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Valves
Example of valves inpetrol-chemicalindustry
, C
, C1111
111
111
, C
, C
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Valves
Leakage detection
Amorphousheating on left(cold) side ofvalve indicates
leakage
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Transfer line
Stress cracks in insulation shown atelbow
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Furnace Items Pressure Vessel
Flange leakage
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Piping
Insulation breakdown
*> . C
*< . C111
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Aluminum cladpiping withbreakdown ininsulation
Support
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Pipe sediment
Sediment in a pipe creates a cold spot
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Pipe sediment
Sediment along the length of this pipe
section shows up cool
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Tank levels
Indicating the fluid level in a storage tank
, C
, C
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Insulation defects
Ice formation in urethane insulation on ammoniatank
(-33 C inside)
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Overhead conduits
Scan ceiling electrical cable in trunking/ piping in difficult to reach areas
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High Voltage Electricity
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Low Voltage Electricity
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Insulation & Pipework
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Summary
Infrared Thermography is one of the moderntechnique used for fault detection anddetermining its severity
It has wide number of applications at powerplants and in process industry
It gives information about the point undermaximum thermal stress
Therefore providing the information about theaging of that equipment/component
Trending of thermal image data helps indetermining how rapidly the fault isdeveloping and hence enabling to estimate
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Thank You!!