ATEX (EXPLOSIVE ATMOSPHERE) LIGHTNING PROTECTION

LIGHTNING RODS IN ATEX

Lightning can be a very powerful source of ignition. In ATEX areas, measures must be taken to prevent fires and explosions. Lightning can also cause electromagnetic surges and pulses.

According to the APQ1 and APQ8 regulations for flammable liquids and ammonia nitrate-based fertilizers, the installation of lightning arresters is mandatory.

If we place a conventional lightning rod tip, we attract lightning, therefore we increase the possibility of impact of a high intensity spark.

TecnoFerran offers the best protection against lightning and complying with ATEX regulations through our PDCE model.

Our PDCE lightning rod model compensates the electrical field of the structure to be protected in time, avoiding ascending tracers and compensating the electric field. Therefore there can be no difference in electrical potential and thus there can be no attraction and therefore there can't be lightning.

TecnoFerran can guarantee the complete protection of an installation and ensure that there will be no lightning strike in the protected installation with 100% efficiency.

CLICK HERE to see more information on PDCE technology

In addition, we can protect the installation against surges.

CLICK HERE to see more information in OVERVOLTAGES section

What is an ATEX zone?

It receives the name of ATEX from the French directive 94/9 / EC French: "Appareils destinés à etre utilisés en ATmosphères EXplosives" Devices intended to be used in Explosive ATmospheres

The explosive atmosphere is any mixture under air conditions and flammable substances in the form of gas, steam or dust in which, after ignition, the unburned mixture spreads.

There are two ATEX directives:

  • The ATEX 95 equipment directive 94/9 / EC. Regulates protective equipment and systems intended for use in potentially explosive atmospheres.
  • The workplace ATEX 137 directive 99/92 / EC. It indicates the minimum requirements for improving the protection of the safety and health of workers exposed to risks derived from explosive atmospheres.

 

Places with flammable gases or vapors:

There are two ATEX atmospheres: Explosive gas atmospheres and explosive dust atmospheres. In these, the formation of explosive atmospheres is possible at any time, for example explosive liquid transfer areas, paint booths, solvent warehouses, etc.

They are subdivided in turn according to the probability of presence of the explosive atmosphere into:

Zone 0: permanent presence or for long periods of time.
Zone 1: susceptible to formation under normal working conditions.
Zone 2: unlikely presence and for short periods.


The security principles to consider will be:

The explosion risk areas will be as small as possible.
The presence of electrical equipment will be minimized and will be protective according to the area.


Places with the presence of Combustible Dust:

As an example we can mention cereal silos, mills, coal treatment plants, fertilizer plants, etc.

Within this class it is distinguished:

Zone 20: This is the zone in which there is or may be combustible dust during normal operation, start-up or cleaning operations, in sufficient quantity to produce an explosive atmosphere. Example: in spray mills.
Zone 21: It is one in which the cloud or dust layer is likely to form under normal working conditions.
Zone 22: unlikely presence and for short periods.


The security principles to consider will be:

Ventilation and thus dust collection will be avoided as much as possible.
Maintenance of cleaning and collection of the dust generated periodically.

Área de trabajo con riesgo de explosión delimitando las secciones:

The electrical equipment will be protected against the entry of dust without any filtration in the following degree:

  •  IP5x. Protection against harmful ingress of dust.
  •  IP6x. Total protection against the ingress of dust.

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