Eco Atex the first customized anti-static cages on the market
Electrostatic discharges are in first place among the causes of fires and explosions in air dedusting systems. Depending on the type of dust present and in certain environmental conditions, the electrostatic discharge can generate enough energy for a trigger with severe consequences for the system and the people present.
Single or multiple electrostatic discharges are generated by the presence of insulators (bag filters) and coupled conductors (filter cages and tube plates).
It is not always possible to ground all the elements of the filtering machine with the same equipotential.
Bag filter cages are made of steel and are therefore conductors of electrical current.
In the contact and detachment between insulation and conductors, any charges present could trigger a dangerous spark.
The solution proposed by CleanAir Europe, the eco Atex filter cages, allows to reduce the electrostatic risk to a minimum without having to connect each filter cages to the ground, through an anti-static and static dissipative characteristic of the filter cages itself, superficially treated with a treatment aimed at giving the best class. of surface resistivity for a gradual transmission to earth of the charges eventually transferred to the filter cages.
A special marking and the declaration of conformity to the Atex Community Directive complete the offer.
Sparks, single or multiple, cause fires and explosions in filtering machines in environments with explosive or particularly dusty gases. Eco Atex avoids the formation of sparks caused by sudden electrostatic discharges. .
Eco Atex is versatile and increases the safety of the filter in any condition, in combination with any type of filter bags, antistatic or insulating once, providing the best path towards a slow discharge to earth of any unwanted current.
Eco Atex is a good thermal insulator, yields surface overheating, maintains its physical characteristics at higher temperatures than epoxy painting or galvanizing. Reduces the risk of flames originating from rubbing or vibration.
Metal rust could cause the bag filter and cage to break prematurely, stain and spoil the filter, and spread corrosion to other metal parts of the filter machine. Eco Atex is an excellent defense against rust.
Eco Atex engineers have studied the best class of surface resistivity of current to avoid the deposition of electrostatic charges on the surface of the cages and allow their slow discharge to the ground.
Each filter system originally has a particular cage designed for that specific solution. With Eco Atex it is always possible to refit and adapt to the different structural types of cage requested. It is a customized product that can be made to measure for the customer. .
SURFACE RESISTANCE CLASS (ohm square)
Eco Atex is positioned along the following scale on the border between anti-static behaviour (collects few charges) and static dissipative (discharges them slowly to the ground)
TOWARDS A PROTECTED ELECTROSTATIC AREA
The graph on the side highlights the four areas of use of the cage in dedusting systems in conjunction with the bag filter. With or without antistatic bag filter, the Eco Atex cage moves to a safer electrical area reducing the risk of a high potential discharge.
TOWARDS A BETTER ENERGY PERFORMANCE
It is well known that charges of an electrostatic nature tend to form and strengthen in contact between distant elements in the triboelectric scale of materials. The treatment based on Eco Atex epoxy resins reduces the distance in the series compared to bare steel and therefore the collection of the charge in contact with the materials most often used for bag filters such as polyester, polypropylene, PTFE, the Polyimide. Less charge means less adhesion of the dust to the textile filter and consequently less use of the compressor and therefore less energy consumption.
For an analysis of the complete triboelectric series of polymers see:
Journal of electrostatics 62 (2004) 277-290 by a.F.Diaz and R.M. Felix -Navarro.
RESISTANCE TO POLLUTANTS
In this table we report qualitative indications of the resistance of Eco Atex to the main polluting chemical species normally present in the filter chambers. With the exception of hydrochloric and hydrofluoric acids for which it is appropriate to monitor the concentrations, Eco Atex resists all the substances mentioned very effectively.
DEGRADATION OF TREATMENT AND BEHAVIOR IN TEMPERATURE
The graph shows how the surface resistivity (10^ ohm square) decreases as the temperature increases and over the time, however, remaining within the useful range to guarantee the antistatic characteristic, at least until the corrosion protection layer is sufficient to protect against rust.
ECO Atex AN ECOLOGICAL LABEL WITH A LOW ENVIRONMENTAL IMPACT.
Eco Atex is a green label according to ISO 14021.
Thanks to the cataphoresis treatment, it prolongs the life of the product over time and consequently reduces the amount of waste. The energy used for the production of the Eco Atex filter cages comes mainly from renewable energy sources. The footprint of the cataphoresis process is among the lowest possible for surface painting treatments.
THE ATEX MARKING
In compliance with the directive, the Eco Atex drum is marked Ce and Atex with a special metal plate which also indicates by means of the envisaged coding: the zones classified for use (example II 3D, zone 22), the temperature ranges (example T2), the means of containment (example m), the traceability references of the batch, the name and address of the manufacturer.
Each Atex filter cages is individually identified.
FAQ - Frequently Asked Questions about Eco Atex
Yes, Eco Atex is a specific surface treatment aimed to achieve a class of superficial resistivity. It adds anti-corrosion features and good resistance to chemicals and temperatures.
Because Eco Atex prevents the main ignition sources originated by electrostatic discharges.
Eco Atex is anti-static because its superficial resistivity varies from 10^9 to 10^6 Ohm square in product life cycle time
Any kind of metals not covered by insulative superficial layers.
Eco Atec Cages are just a little more expensive than galvanised cages but with higher performance about corrosion and heat resistance.
The lasting of the cages is depending on several factors like temperature, humidity, presence of chemicals. Tests in saline chamber report 1800 hours before any rust spots against 150 hours of zinc-plating coating
According to Directive 2014/34/Eu definitions: number (3) L96/314 “components” means any item essential to the safe functioning of equipment but with no autonomous function. Atex rules could be applied to “components” and not only to “Equipment”. (See atex directive pag. L96/313-314 )
According to the Directive, 2014/34/EU rules of internal production control according to ANNEX VIII are applied. Eco Atex domain is for use in Equipment Category 3. ( See Atex directive page. 96/318 - L96/349)
FAQ - Frequently Asked Questions about Eco Atex
Eco Atex advantages could be resumed in an antistatic behaviour which decreases the likelihood of explosion and fire in dust collectors, good resistance to corrosion and chemicals, a good heat resistance.
The combination of Eco Atex treatment and the steel support base is to be considered anti-static and static dissipative.
Zone 22, Eco Atex could be used also in Zone 21 when the specific documentation is released by the auditors. (see pag. L96/327-328)
For any type of dust collector based on jet pulse technology.
Not yet, as soon as this approval is not compulsory for use in zone 21 and 22.
(see pag. L96/327-328)
Yes, both for protection against corrosion and superficial resistivity values determination.
Yes, it has been tested in different working conditions and environments
Eco Atex can be considered an anti-corrosive treatment. Test in saline chamber reaches 1800 hours before first rust spots start.
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