GOST R Explosion Protection (ATEX)

As part of the industrialization explosion control becomes more and more important for public safety. To protect humans and properties laws are passed by the EU concerning the matter of explosion protection. These laws are named ATEX because of their French origin „Atmosphère explosible“. The EU laws are comparable to the independent explosion prevention laws of the Russian state, the so called GOST R Explosion Protection Certificate.

The certification process is divided into two parts depending on the extent and the duration of the validity.

Serial deliveries:

For a larger amount of devices the devices has to be checked by an expert accredited by the Russian authorities in most of the cases. On the basis of several test criteria he experts investigate the explosion protection implemented in the devices and search for mistakes. The check also includes the reliability of the quality management system, which has been used to produce the devices. With reference to this the experts have to concern a stable incoming and pre-delivery component inspection, the quality of the production process and the exclusion of mistakes. Mostly an attendance of the experts at the fabrication is required to match the aim of the directions.

Single deliveries:

For only one delivery of a devices, in particular simple units, it is not always necessary to let the devices been checked personally by Russian experts.

Units:

In case of a complex unit the interaction with the environment must be inspected alongside the explosion prevention check. The experts do control the features of the unit at whole and the construction elements in special and decide in which application areas the unit is allowed to be placed without any risk.

All explosion risks and explosion protection elements must be declared by the exporter.  Otherwise the exporter is liable for defects, if an explosion happens. The check is cleared with the disposition of the explosion protection label, which has to be fixed on the unit and mentioned in the documents. After the explosion certification the exporter is able to go further for the RosTEchNadsor admission in the next step. Not till then the unit it is allowed to activate on the territory of the Russian state.

Contact us. We will help you to manage the certification process.

Explosion protection basics:

Primary explosion protection: risky explosion areas.

The primary explosion protection is aimed to avoid the creation of explosive atmospheres. Such atmospheres are a mixture of gases, damps or exhalations. It is not possible to avoid these kinds of mixtures always because maybe there are unavoidable by-products of the proper work of the device according to its aim. A nomenclature helps to judge the potential risk of the aeriform mixtures in a well arranged way. The risk potential is judged by the frequency and endurance of the atmospheres and afterwards the conception of protection measures.

Secondary explosion protection: ignition protection measures

While the main intention of the primary explosion prevention is the danger defence against atmospheres the secondary explosion protection tries to inhibit ignition sources. The simultaneous appearance of explosive atmospheres and ignition sources are one of the most dangerous causes of explosions. Likewise the primary explosion protection it is the target of the secondary explosion protection to prevent the concurrent development of elements, which could lead altogether to an explosion, as far as possible. The secondary explosion protection is differentiated into two fields: protection against gazes and against dust.

Protection measures against gazes are prepared to reduce the ignition risk of materials, whereas measures against dust intend to avoid the penetration of dust. It has to be mentioned clearly, one imminent cause of dangers is the penetration of dust into the device. The circumvention of dust penetration makes a device far much safer and helps to minimize the risk to an acceptable level. Smouldering as a result of interactions between machine components and flour can be eliminated. In the code of praxis different protection methods are applied to find the most useful prevention solution in a special case.

In the following protection measures against flammable processes and materials of electric devices are described. Actually for special tools like clamps the safety directions are once more higher. The technical beginning refers to the coating of the device, which must be a pressure-resistant casing of sufficient denseness and so is able enough to prevent the emission of ignition sparks into the environment. Without the compliance of the construction norms of materials, manufacturing and measurements it is not possible to achieve this aim. Equal to this are similar methods of pressure-resistant casing, for example coating in a bath of oil or sand or the so called encapsulation.

Another method is the generation of permanently over pressure, for example the injection of inert gaze could be concerned.

An additional factor of an effective explosion protection is the ignition temperature of the surface of the device, which could be classified with another technical nomenclature. The temperature class does determine the allowed surface temperature of the electric unit relative to the temperature array of the gaze mixture. For example the class T1 does ignite the gaze mixture by a degree Celsius of over 450. Hence the permitted surface temperature is a maximal degree Celsius of 450.

Temperature class
ignition temperature array of the gaze mixtures allowed surface temperature of the electrical device
T1 > 450 °C 450 °C
T2 > 300 … ≥450 °C 300 °C
T3 > 200 … ≥300 °C 200 °C
T4 > 135 … ≥200 °C 135 °C
T5 > 100 … ≥135 °C 100 °C
T6 > 85 … ≥100 °C 85 °C

The explosion protection certification process is closed with the dispensation of the label. Also the features of the label are regulated to make the purpose of the unit easy clear. The label does inform about the manufacturer, the application area, the explosion class, the ignition protection measures and the temperature class.

The application area is differentiated into three groups: underground (I), remaining areas (II) and gazes and damps - G -, dust - D or cavities - M -.

Last but not least there are the following information about the certification process necessary:

  • Checking facility
  • Industrial norm
  • Registration number
  • Starting conditions



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