By Torben Jespen
This booklet information how safeguard (i.e. the absence of unacceptable hazards) is ensured in parts the place almost certainly explosive atmospheres (ATEX) can come up. The e-book additionally bargains readers crucial details on tips on how to agree to the most recent (April 2016) european laws whilst the presence of ATEX can't be avoided.
By proposing normal advice on concerns bobbing up out of the ecu ATEX laws – particularly on quarter class, explosion hazard evaluate, apparatus categorization, Ex-marking and comparable technical/chemical facets – the e-book presents apparatus brands, accountable employers, and others with the fundamental wisdom they should be capable to comprehend the various – and infrequently complex – features of ATEX and to enforce the mandatory protection precautions. As such, it represents a useful source for all these occupied with retaining excessive degrees of security in ATEX environments.
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Additional resources for ATEX—Explosive Atmospheres: Risk Assessment, Control and Compliance
G. glass contra iron rust) with which the flammable mixture is in contact can affect the value very much. Tig is an important parameter for the explosion risk assessment and equipment selection—see also Chap. 5, but does not enter zone classiﬁcation deliberations. As the temperature equipment classiﬁcation code for ATEX equipment in Group IIG is also used as a characterizing parameter attached to the respective gas/vapours, this code should be mentioned here. 3. 3 Temperature class codes Class code Max surface temp.
Electrical equipment “protected by enclosure” relies on excluding the dust from the inside of the equipment in order to prevent ignition. Electrical equipment of Group II, category 1 and 2, needs to be built to IP6X speciﬁcations (Dust-tight enclosure), and electrical equipment of Group II, category 3, in general to IP5X speciﬁcations (Dust-protected). But where the possible explosive atmosphere consists of conductive dust, electrical equipment for use in zone 22 (Group II, Category 3 D equipment) must fulﬁll IP6X speciﬁcations (alternatively, group II, Category 1 or 2 equipment, may be procured—when economically feasible).
Important inert (as far as concerning ﬁre circumstance) gases, according to their effectiveness, are: 1. Carbon dioxide (CO2) 2. Steam (H2O) 3. g. from the cement rotary kiln or hot gases from a hot gas generator which contain low O2 levels) 4. Nitrogen (N2) 5. Noble gases such as Argon and Helium Information on inerting can be found in the guidelines: • CEN/TR 15281 • VDI 2263-2 • BGV C15 Inerting systems are not regarded as protective systems in the meaning of the ATEX Equipment directive 2014/34.
ATEX—Explosive Atmospheres: Risk Assessment, Control and Compliance by Torben Jespen