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Inerting Systems

When looking for the application of Directive 94/9/EC to inerting systems one has to consider three different cases:

1. Preventing an explosive atmosphere

Inerting systems are aimed at reducing or completely preventing the existence of an explosive atmosphere in specific areas. Inerting systems are not, however, intended to stop or restrain incipient explosions, hence they are not protective systems within the meaning of Directive 94/9/EC. The goal of inerting systems is different from those of explosion suppression systems, which may sometimes have similar parts, but are aimed at restraining a incipient explosion.

2. Inerting systems as equipment

An inerting system may (in part) also consist of parts which are intended for use within an explosive atmosphere and which have a potential ignition source of their own. These parts come – individually or possibly combined – under the scope of Directive 94/9/EC as "equipment". Also in this case their function of preventing an explosive atmosphere by inerting is not to be assessed within the meaning of this Directive.

3. Inerting systems as part of the ignition protection concept

In some cases, such systems may be part of the ignition protection concept of "explosion protected" equipment to fulfil the requirements of annex II of the Directive 94/9/EC, i.e. if they work as a means to protect potential ignition sources of the equipment from coming into contact with an existing potentially explosive atmosphere. This equipment, including its inerting system, comes as part of the equipment under the scope of Directive 94/9/EC. This inerting system is not a protective system according to article 1(1). Its parts may be safety, controlling and regulating devices according to article 1(2) of Directive 94/9/EC when separately placed on the market.