12 Jun 2024

AEMT Guide - Introduction to Ex repairs

This guide equips users with essential knowledge on explosion protection techniques, the complexities of repairing Ex-rated equipment, and the critical roles of responsible personnel. By adhering to these guidelines, organisations can safeguard lives, protect the environment, and maintain operational integrity.


  • Importance of proper maintenance and repair of Ex-rated equipment
  • Potential consequences of improper repairs (e.g., Deepwater Horizon, Piper Alpha)

Legislation and Standards

  • Overview of ATEX Directive and IECEx scheme
  • Specific requirements for hazardous zones

Explosion Protection Techniques

  • Different protection techniques for various zones:
    • Ex d: Flameproof protection
    • Ex t: Dust protection
    • Ex e: Increased safety protection
    • Ex p: Pressurised enclosures

Design Criteria for Ex-Rated Equipment

  • Differences between Ex-rated and non-Ex-rated equipment
  • Importance of controlling surface and operating temperatures
  • Higher IP ratings to prevent ingress of hazardous substances

Repairing Ex-Rated Equipment

  • Complexity and involvement in repairing Ex-rated equipment
  • Roles and responsibilities:
    • Responsible Person: Ensures compliance, supervises operatives, maintains records
    • Operatives: Engineers and technicians performing repairs

Training and Certification

  • Need for specialised training for Ex repairs
  • AEMT training courses and their benefits
  • Importance of staying updated with standards and legislation

Traceability and Documentation

  • Importance of maintaining detailed records for ten years
  • Documentation requirements:
    • Drawings
    • Electrical and mechanical measurements
    • Written agreements between user and repairer

The Ex Register

  • Benefits of choosing a repair facility from the AEMT Ex Register
  • Requirements for inclusion in the register:
    • ISO 9001 quality control system
    • Calibrated equipment
    • Trained and competent personnel


  • Emphasis on the critical nature of correct repairs in hazardous areas
  • Necessity of ongoing investment in training, tools, and systems
  • Ultimate responsibility for compliance and safety rests with the end-user

For more detailed information and to find accredited service centres, visit the AEMT Ex Register at bit.ly/AEMTEx.

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