Mechanical (Ex11)

CompEx certification for mechanical operatives where gas, vapours and dust can create explosive atmospheres.

Mechanical (Ex11)

The CompEx Ex11 Mechanical qualification has been developed for mechanical operatives working in hazardous locations where gases, vapours or dusts can form explosive atmospheres.


This qualification is suitable for practicing mechanical operatives who are involved in installing, inspecting and maintaining non-electrical (mechanical) equipment in locations where gases, vapours and/or dusts can potentially create a hazardous area.

Entry requirements:

  • Practicing competent mechanical operatives
  • Practicing competent multi-skilled operatives
  • Mechanical engineers with previous practical experience
  • Electro-mechanical engineers with previous practical experience
  • Prior CompEx certification supported by employer sponsored letter


Approximately 3 days, however; some international centres offer an extended course to further support candidates where English is not their first language.


The 3-day course includes:

  • 2 days of guided learning (theoretical 8-12 hours, practical 2-4 hours)
  • 1 days of assessment

This course has been developed in consultation with industry to ensure the core competence of mechanical workers who operate in hazardous environments.

The course consists of a single unit, which incorporates elements from the CompEx Foundation qualification (ExF) to include fundamentals in hazardous awareness and Ex principles.

Candidates will learn about the safety considerations that should be applied to work areas that contain potentially explosive or flammable atmospheres and the factors that are used to classify their location.

The course includes instruction on how to read hazardous area certification, labelling and documentation, and also informs candidates about the main protection concepts, categories and levels that are applied to certified Ex electrical and mechanical equipment.

Successful candidates will demonstrate the knowledge and skills to meet the requirements highlighted in the IEC 60079 series of standards and the relevant national standards and directives.

Key learning objectives

 Candidates that successfully complete the Ex11 Mechanical qualification will be able to:

  • Identify the correct national regulations, directives and IEC standards which are applicable to hazardous locations containing non-electrical (mechanical) equipment.
  • Identify the correct criteria and descriptors used to classify a hazardous location.
  • Recognise the correct characteristics of common hazardous gases, vapours and dusts discussed during the course.
  • Demonstrate an understanding of the basic method and requirements for non-electrical equipment for hazardous locations (constructional safety ‘c’, control of ignition source ‘b’ and liquid immersion ‘k’)
  • Demonstrate an understanding of how certified Ex non-electrical equipment maintains its protection concept and how it is to be selected, installed, inspected and maintained.
  • Demonstrate an understanding of how certified Ex electrical equipment maintains its protection concept and how it is to be selected, installed, inspected and maintained
  • Demonstrate an understanding of required correct equipment selection, e.g. flange, gaskets, bolts and use of current industry flange installation practices.
  • Demonstrate an understanding of leak testing requirements of installed flange arrangements

Qualification details

Candidates who are successful in both the theory and practical assessments will receive a CompEx Certificate in Core Competence. For more details about the content of this qualification and information on the learning objectives please download the Ex11 qualification document.



Assessment is undertaken using both practical assessments and an online examination that covers the CompEx units Ex F and Ex11.

Online exam

Candidates must undertake a multiple-choice online examination that consists of 60 questions answered over 1.5 hours.

Practical Assessments:

Candidates are required to undertake two practical assessments:

  • Ex11 – Flange Integrity Installation and leak test – 60 minutes
  • Ex11 – Pumpset inspections (visual and detailed) – 60 minutes

Find a centre

Find your nearest licensed CompEx centre and get full contact details using our simple map facility.

Retain certification

Achieving CompEx core competency is essential for practitioners who work in potentially explosive environments, but competency must be maintained following certification.

Resource centre

The CompEx resource centre provides all the essential forms, documentation and downloads that you may need for CompEx training and registration

Applicable industries:

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