Thermographic Imaging Inspections Procedure
Thermographic Imaging Inspections Procedure
Objective
To provide a comprehensive guide for conducting thermographic imaging inspections as part of periodic preventive maintenance and inspections of the electrical distribution system. This non-intrusive and non-destructive inspection method helps identify heating issues in faulty plant and equipment, allowing for timely preventive maintenance without interrupting production processes.
Scope
Applicable to site.
Performance Criteria
- Legal requirements
- Corporate requirements
Responsible Parties
- Safety officer Site
- Qualified User
Related Documents
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References
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Procedure
Introduction
Thermographic Imaging Inspections are essential for maintaining the safety and reliability of electrical and mechanical systems. This procedure outlines the responsibilities and steps for conducting these inspections.
Delta-T Classification and Required Actions
The table below indicates temperature change ranges and the corresponding actions:
| Delta-T Classification | Action Required | Category |
|---|---|---|
| 0°C to 10°C | Possible fault developing. Continue monitoring for possible deterioration. | Monitor |
| 10°C to 20°C | Schedule corrective measures. | Next Shutdown |
| 20°C to 40°C | Urgent corrective measures required. | Urgent |
| 40°C and above | Immediate corrective measures required. | Immediate |
Note: Immediate action requires an immediate shutdown, replacement of faulty equipment, and a follow-up thermographic inspection to confirm the issue is resolved.
Types of Electrical Equipment to be Surveyed
- All plant and equipment
- Cable runs
- Bus ducts
- Main switchboards
- Distribution sub-boards
- Motor control panels
- Motors
- Substation equipment
Qualified Personnel
A qualified person must conduct the survey. This individual should have:
- Skills and knowledge related to the construction and operation of electrical equipment and installations.
- Safety training on the hazards involved.
Requirements:
- Training and certification per legal requirements or equivalent (e.g., NFPA 70E, Electrical Safety Requirements for Employee Workplaces).
- Knowledge of equipment and system hazards (e.g., medium voltage, low voltage, environment).
- Use of appropriate personal protective equipment (PPE), including clothing, face shielding, and gloves.
Minimum Information Required in Thermographic Report
- Identified signs of damage or overheating.
- Date and location of the survey.
- Criteria used to identify potential issues.
Frequency of Inspections
Thermographic Imaging Inspections should be conducted at least once per year.
Reporting
The competent person will issue a report detailing any observed damage, deterioration, defects, dangerous conditions, and non-compliances with current safety standards.
Non-Conformity Case
The safety officer should follow up on non-conformity cases until they are resolved and documented in the report.
Report Keeping
The Thermographic Imaging Inspection report should be retained by the safety officer for future reference.
This revised procedure aims to be clearer and more structured, ensuring all necessary steps and responsibilities are well-defined.
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