The ATEX directives consists of two EU directives describing the minimum safety requirements of the workplace and equipment used in explosive atmosphere. ATEX derives its name from 'Appareils destinés à être utilisés en ATmosphères EXplosives' (French for Equipment intended for use in EXplosive ATmospheres). Spotless 1 1 1 – organise files like magic full.
For example, 4.5 m/s steel-steel friction with a force greater than 2 kN is an effective ignition source. The combination of aluminium and rust is also notoriously dangerous. More than one red hot spark is often necessary in order to have an effective ignition source. Electric sparks. For example, a bad electrical connection or a faulty.
- AText 0.10.2 Released on 31/12/19. Fixed a major issue with setttings and a reported crash. AText 0.10.1 Released on 25/12/19. Fixed a major issue since version 0.9. Added Workaround for some system applications. Improved compatibility with some system applications.
- 1 + M1 2 + M2 Electrical 2 + M2 Non-electrical 3 EC-Type Examination (III) NB NB Production QA (IV) NB Product Verification (V) NB Conformity to Type (VI) NB + M Product QA (VII) NB Internal Control of Production (VIII) M (+ deposit file) M Unit Verification (IX) (NB) (NB) (NB) (NB).
Directives[edit]
Mark for ATEX certified electrical equipment for explosive atmospheres.
Organisations in the EU must follow Directives to protect employees from explosion risk in areas with an explosive atmosphere.
There are two ATEX Directives (one for the manufacturer and one for the user of the equipment):
- the ATEX 214 'equipment' Directive 2014/34/EU - Equipment and protective systems intended for use in potentially explosive atmospheres
- the ATEX 137 'workplace' Directive 1999/92/EC - Minimum requirements for improving the safety and health protection of workers potentially at risk from explosive atmospheres.
Note: The ATEX 95 'equipment' Directive 94/9/EC, was withdrawn on 20 April 2016 when it was replaced by ATEX 214 Directive 2014/34/EU. ATEX Directive 2014/34/EU is mandatory for manufacturers as of 20 April 2016 as stated in article 44 of the Directive.
ATEX Directive 2014/34/EU was published on 29 March 2014, by the European Parliament. It refers to the harmonisation of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres.
Regarding ATEX 99/92/EC Directive, the requirement is that Employers must classify areas where potentially explosive atmospheres may occur, into zones. The classification given to a particular zone, and its size and location, depends on the likelihood of an explosive atmosphere occurring and its persistence if it does.
Equipment in use before July 2003 is allowed to be used indefinitely provided a risk assessment shows it is safe to do so.
The aim of Directive 2014/34/EU is to allow the free trade of ‘ATEX’ equipment and protective systems within the EU by removing the need for separate testing and documentation for each member state.
The regulations apply to all equipment intended for use in explosive atmospheres, whether electrical or mechanical, including protective systems. There are two categories of equipment 'I' for mining and 'II' for surface industries. Manufacturers who apply its provisions and affix the CE marking and the Ex marking are able to sell their equipment anywhere within the European Union without any further requirements with respect to the risks covered being applied. The directive covers a large range of equipment, potentially including equipment used on fixed offshore platforms, in petrochemical plants, mines, flour mills and other areas where a potentially explosive atmosphere may be present.
Later 1 0 4 – schedule reminders using natural language. In very broad terms, there are three preconditions for the directive to apply: the equipment a) must have its own effective source of ignition; b) be intended for use in a potentially explosive atmosphere (air mixtures); and c) be under normal atmospheric conditions.
The directive also covers components essential for the safe use and safety devices directly contributing to the safe use of the equipment in scope. These latter devices may be outside the potentially explosive environment.
Manufacturers/suppliers (or importers, if the manufacturers are outside the EU) must ensure that their products meet essential health and safety requirements and undergo appropriate conformity procedures. This usually involves testing and certification by a ‘third-party’ certification body (known as a Notified Body e.g. Vinçotte, Intertek, Sira, Baseefa, Lloyd's, TUV ICQC) but manufacturers/suppliers can ‘self-certify’ Category 3 equipment (technical dossier including drawings, hazard analysis and users manual in the local language) and Category 2 non-electrical equipment, but for Category 2 the technical dossier must be lodged with a notified body. Once certified, the equipment is marked by the ‘CE’ (meaning it complies with ATEX and all other relevant directives) and ‘Ex’ symbol to identify it as approved under the ATEX directive. The technical dossier must be kept for a period of 10 years.
Certification ensures that the equipment or protective system is fit for its intended purpose and that adequate information is supplied with it to ensure that it can be used safely. There are four ATEX classification to ensure that a specific piece of equipment or protective system is appropriate and can be safely used in a particular application: 1. Industrial or Mining Application; 2. Equipment Category; 3. Atmosphere; and 4. Temperature.
The ATEX as an EU directive finds its US equivalent under the HAZLOC standard. This standard given by the Occupational Safety and Health Administration defines and classifies hazardous locations such as explosive atmospheres.
Technical definitions[edit]
In DSEAR, an explosive atmosphere is defined as a mixture of dangerous substances with air, under atmospheric conditions, in the form of gases, vapours, dusts or fibres in which, after ignition has occurred, combustion spreads to the entire mixture.
Atmospheric conditions are commonly referred to as ambient temperatures and pressures. That is to say temperatures of −20 °C to 40 °C and pressures of 0.8 to 1.1 bar.[1]
Zone classification[edit]
The ATEX Directive covers explosions from flammable gas/vapours and combustible dust/fibres (which, contrary to common perception, can lead to hazardous explosions[2])
Hazard – Gas/vapour/mist
- Zone 0 – A place in which an explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapour or mist is present continuously or for long periods or frequently.
- Zone 1 – A place in which an explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapour or mist is likely to occur in normal operation occasionally.
- Zone 2 – A place in which an explosive atmosphere consisting of a mixture with air of dangerous substances in the form of gas, vapour or mist is not likely to occur in normal operation but, if it does occur, will persist for a short period only.
Hazard – dust/fibres
- Zone 20 – A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is present continuously, or for long periods or frequently.
- Zone 21 – A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is likely to occur in normal operation occasionally.
- Zone 22 – A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is not likely to occur in normal operation but, if it does occur, will persist for a short period only.
- Effective ignition source
Effective ignition source is a term defined in the European ATEX directive as an event which, in combination with sufficient oxygen and fuel (gas, vapour, dust or fibres), can cause an explosion. Methane, hydrogen or coal dust are examples of possible fuels.[3]
Effective ignition sources are:
- Lightning strikes.
- Open flames. This varies from a lit cigarette to welding activity.
- Mechanically generated impact sparks. For example, a hammer blow on a rusty steel surface compared to a hammer blow on a flint stone. The speed and impact angle (between surface and hammer) are important; a 90 degree blow on a surface is relatively harmless.
- Mechanically generated friction sparks. The combination of materials and speed determine the effectiveness of the ignition source. For example, 4.5 m/s steel-steel friction with a force greater than 2 kN is an effective ignition source. The combination of aluminium and rust is also notoriously dangerous. More than one red hot spark is often necessary in order to have an effective ignition source.
- Electric sparks. For example, a bad electrical connection or a faulty pressure transmitter. The electric energy content of the spark determines the effectiveness of the ignition source.
- High surface temperature. This can be the result of milling, grinding, rubbing, mechanical friction in a stuffing box or bearing, or a hot liquid pumped into a vessel. For example, the tip of a lathe cutting tool can easily be 600 Celsius (1100 °F); a high pressure steam pipe may be above the auto-ignition temperature of some fuel/air mixtures.
- Electrostatic discharge. Static electricity can be generated by air sliding over a wing, or a non-conductive liquid flowing through a filter screen.
- Radiation.
- Adiabatic compression. Air is pumped into a vessel and the vessel surface heats up.
See also[edit]
- DSEAR Regulations 2002 (UK implementation of ATEX 137)
- EPS Regulations 2016 (UK implementation of ATEX 214)
- IECEx IECEx website
References[edit]
- ^'ATEX and explosive atmospheres'. HSE UK.
- ^https://www.powderprocess.net/Safety_ATEX.html
- ^Michelis, J.: 'Explosionsschutz im Bergbau unter Tage', Verlag Glückauf Essen, 1998, ISBN3-7739-0900-4
External links[edit]
- The Dangerous Substances and Explosive Atmospheres Regulations 2002 (UK)
- https://www.gov.uk/government/publications/equipment-and-protective-systems-intended-for-use-in-potentially-explosive-atmospheres-regulations-2016 Equipment and Protective Systems Intended for Use in Potentially Explosive
Atmospheres Regulations 2016] (UK)
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text Catil. THE FIRST ORATION OF M. T. CICERO AGAINST LUCIUS CATILINA. DELIVERED IN THE SENATE.chapter 1
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THE SECOND ORATION OF M. T. CICERO AGAINST LUCIUS CATILINA. ADDRESSED TO THE PEOPLE. chapter 1
chapter 2
chapter 3
chapter 4
chapter 5
chapter 6
chapter 7
chapter 8
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chapter 10
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chapter 12
chapter 13
THE THIRD ORATION OF M. T. CICERO AGAINST LUCIUS CATILINA. ADDRESSED TO THE PEOPLE. chapter 1
chapter 2
chapter 3
chapter 4
chapter 5
chapter 6
chapter 7
chapter 8
chapter 9
chapter 10
chapter 11
chapter 12
THE FOURTH ORATION OF M. T. CICERO AGAINST LUCIUS CATILINA. DELIVERED IN THE SENATE. chapter 1
chapter 2
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2. [4] The senate once passed a decree that Lucius Opimius, the consul, should take care that the republic suffered no injury. Not one night elapsed. There was put to death, on some mere suspicion of disaffection, Caius Gracchus, a man whose family had borne the most unblemished reputation for many generations. There was slain Marcus Fulvius, a man of consular rank, and all his children. By a like decree of the senate the safety of the republic was entrusted to Caius Marius and Lucius Valerius, the consuls. Did not the vengeance of the republic, did not execution overtake Lucius Saturninus, a tribune of the people, and Caius Servilius, the praetor, without the delay of one single day? But we, for these twenty days have been allowing the edge of the senate's authority to grow blunt, as it were. For we are in possession of a similar decree of the senate, but we keep it locked up in its parchment—buried, I may say, in the sheath; and according to this decree you ought, O Catiline, to be put to death this instant. You live,—and you live, not to lay aside, but to persist in your audacity.
I wish, O conscript fathers, to be merciful; I wish not to appear negligent amid such danger to the state; but I do now accuse myself of remissness and culpable inactivity. [5] A camp is pitched in Italy, at the entrance of Etruria, in hostility to the republic; the number of the enemy increases every day; and yet the general of that camp, the leader of those enemies, we see within the walls—yes, and even in the senate, —planning every day some internal injury to the republic. 1 If, O Catiline, I should now order you to be arrested, to be put to death, I should, I suppose, have to fear lest all good men should say that I had acted tardily, rather than that any one should affirm that I acted cruelly. But yet this, which ought to have been done long since, I have good reason for not doing as yet; I will put you to death, then, when there shall be not one person possible to be found so wicked, so abandoned, so like yourself, as not to allow that it has been rightly done. [6] As long as one person exists who can dare to defend you, yet shall live; but you shall live as you do now, surrounded by my many and trusty guards, so that you shall not be able to stir one finger against the republic: many eyes and ears shall still observe and watch you, as they have hitherto done, though you shall not perceive them.
1 This is the same incident that is the subject of the preceding oration in defence of Rabirius.
M. Tullius Cicero. The Orations of Marcus Tullius Cicero, literally translated by C. D. Yonge, B. A. London. Henry G. Bohn, York Street, Covent Garden. 1856. The National Endowment for the Humanities provided support for entering this text.
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