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Thermography

One of several techniques for collecting data on the condition of an asset.

Remote infrared scanning of assets to determine the temperature of components within the overall assembly. "hot spots" can signify loose components in electrical assets or heat loss in enclosure components. .



Purpose
The objective of thermographic scanning of assets is:

Candidate Assets
Listed below are some of the candidate assets for IR thermography:
MethodAssetsIntervals, yrs
Electrical
assets
High voltage insulator
Electrical connections
Panelboards
Switchgear
MCCs
Generators
Other
Mechanical assetsElectric Motors
Furnace refractories
Boilers
Other
Enclosure assetsRoofs, ModBit
Windows
Doors
Facades
Other

       

Process

Listed below are the key steps in the process:

A. Before Analysis
  • Determine whether to purchase the thermographci equipment (cameras and software) or engage contractor
  • Train staff, as required
  • Schedule and execute the analysis as part of a major maintenance program
B. During Analysis
  • The process of monitoring the condition of equipment through the measurement and analysis of heat.  
  • Analyze the results
  • Grade the results
Listed below are the condition grades for this technology
  • Not applicable
  • Signal detected
C. After Analysis
  • Report to stakeholders
  • Make decisions
  • Determine CAPA's, if any
  • Determine next assessment interval

Evaluation

A.  Pros
Listed belows are some of the pros of thermographic inspection:

  • It has the widest range of application (from high- to low-speed equipment)
  • Generally considered to currently be the most cost-effective technology
  • Other
B. Cons.
Listed below are some of the cons of thermographic inspection:

  • Equipment is expensive
  • It does not ascertain demand condition or functional condition of assets. 
  • Other
The different applications of thermographic scans to various assets
Fig. Some of the different applications of thermographic scans to various assets.


Comparing the Maintenance-Repair-Renewal (MRR) trade-offs at different organizations.
Fig. Comparing the Maintenance-Repair-Renewal (MRR) trade-offs at different organizations.


Thermography as one of the predictive maintenance (pdM) technologies along the P-F Curve in relation to Potential Failure (P) and Functional Failure (F)
Fig. Thermography as one of the predictive maintenance (PdM) technologies along the P-F Curve in relation to Potential Failure (P) and Functional Failure (F).


Major maintenance tasks mapped to the P-F Curve
Fig.  Different types of maintenance activities at various life stages of an asset with thermography typically commissioned during the later stages.



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