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Explosion protection for mechanical engineering

Current information about explosion protecton for mechanical engineering

With our current technical information, we want to keep you up to date – compact and clear. Benefit from the know-how gained from decades of experience in different application areas of explosion protection.


ATEX and IECEx certification: a useful combination for mechanical engineering

August 2021

The consequent standardization of technology in the field of explosion protection for electrical equipment, which began over 100 years ago, is now based on mature IEC standard (EN IEC 60079-0 ff). The introduction of international ISO standards (EN ISO 80079-36, -37) for explosion protection of non-electrical equipment supplements the electrical standards. The visible identification for non-electrical equipment is the protection type Ex h and the equipment protection level (EPL). The proven principle of graduation of explosion protection measures with equipment protection levels for use in Ex zones is now also applied to non-electrical equipment.

Basically, a holistic view of the machine or system according to state-of-the-art technology (standards) is required both within and outside of Europe. The important task for the manufacturer of machines is the risk assessment of ignition sources, construction, the definition of ignition protection measures, testing, certification, and the conformity assessment. According to both ATEX and IECEx, inspection bodies must be involved.

ATEX is a legal system (Directive 2014/34/EU) of the EU and regulates the market access for products to be used in Ex areas. IEC is an international standardization organization also for equipment to be used in Ex areas. The IECEx system serves for certification of conformity with the IEC standards and is voluntary in Europe.

The following table provides a comparison of the two systems and contains further links.

 

Comparison of the ATEX- and IECEx-Certification

  ATEX IECEx
Validity Required by law in the EU Voluntary in the EU
Different acceptance worldwide
Directives and standards RL 2014/34/EU
EN IEC 60079-0 ff
EN ISO 80079-36 and -37
IEC 60079-0 ff
ISO 80079-36 and -37
Conformity for electrical equipment Cat. 1 und 2:
Quality Assessment Report
EU Type examination certificate
EU Declaration of conformity
CE Marking
Cat. 3:
Internal production control
EU Declaration of conformity
CE Marking
EPL a, b, c:
Quality Assessment Report (QAR)
Test Report (ExTR)
Certificate of Conformity (CoC)
Marking
Conformity for non-electrical equipment Cat. 1:
Quality Assessment Report
EU Type examination certificate
EU Declaration of conformity
CE Marking
Cat. 2* und 3:
Intrernal production control
EU Declaration of conformity
CE Marking
 
*Technical documentation at notified body (deposit)
EPL a, b, c:
Quality Assessment Report (QAR)
Test Report (ExTR)
Certificate of Conformity (CoC)
Marking
Used similar to electrical equipment (for all EPLs the same)
Access to certificates EU type examination certificate (manufacturer, online)
EU declaration of conformity (manufacturer)
IEC Online Database with IEC CoCs

 

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Engineering and installation of electrical Ex-equipment

June 2021

Standardized electrical equipment is often individually planned and installed on the basis of specific customer requirements. While engineering the Ex-solution, it is crucial to carefully examine all relevant Ex aspects at an early stage.

Electrical explosion protection for mecanical egineering

The specifications in the context of explosion protection must be carefully coordinated with the customer, i. e. the Ex-parameters, e. g. zone classification/equipment categories as well as Ex parameters for flammable substances (gases, vapors and dusts). Based on this the suitable suppliers for electrical equipment are selected.

The engineering, installation and initial testing of the electrical Ex equipment and systems should be implemented professionally. For this mix of tasks, planners and electricians can find comprehensive information in DIN EN IEC 60079-14 for the selection and installation of electrical devices in Ex areas.

For electrical Ex devices, their marking provides all the essential information. (PDF)

Electrical equipment for switching, controlling, regulating, mobile or stationary, naturally find their way into safe Ex-applications today. The development of internationally uniform protection concepts and standards (EN IEC 60079-0 ff) in electrical engineering have made a decisive contribution to this. If necessary, Ex technologies (types of protection) must be implemented internally using the relevant standards.

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Construction and certification of mechanical Ex-equipment

April 2021

Non-electrical equipment is often implemented individually on the basis of specific customer requirements. The specification in the context of explosion protection (zones/equipment categories, Ex parameters: temperature class,

Mechanical explosion protection for mechanical engineering

Ex group) is decisive for the construction of the Ex-machines. This must be coordinated with the customer carefully and at an early stage.

In the EU, the ATEX Directive 2014/34/EU has always provided a legal basis for the testing and certification of mechanical equipment and assemblies for use in Ex areas. The IECEx system has been offering a similar certification framework for mechanical equipment and combinations outside the EU for about 2 years.

The systematic ignition source assessment is the starting point for the definition and implementation of individual ignition protection measures and the application of suitable types of protection (Ex h). The international standards for non-electrical Ex devices (EN ISO 80079-36, -37) provide the technical basis and support for this. They complement the IEC standards and thus expand the Ex-requirements for process machines.

The new Ex marking for non-electrical devices (PDF) with the Ex h type of protection and the device protection values Ga, Gb, Gc (gases) or Da, Db, Dc (dust) gives information for safe use in Ex zones and are a clear identifier for the implementation of the new standards.

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