UKM-SUM24-PG44+45_Layout 1 26/06/2024 17:05 Page 45
AIR CLEANING
Figure 1: example of zoning dust collector
where there is danger for up to 1,000 hours per year, and finally Zone 20 (Zone 0 for gas) where there is frequent or continuous risk. Bear in mind that any major changes or new processes – perhaps as a result of increased production rates or advancements in technology – will require a new explosion protection document, so identifying any future plans for remodeling or expansion will be extremely worthwhile. Should process changes lead to the need for a different ATEX certification, equipment can be modified but will need recertification from a notified body or expert to ensure CE conformity.
CONSTRUCTOR’S CHALLENGE A prime example of Zone 20 would be the constant dust cloud inside a dust collector (see Figure 1). This highlights the importance of ensuring that any such equipment – including protective systems such as isolation devices, safety devices such as overload protection devices, or components such as vent ducts – is fully compliant with ATEX 114 Directive 2014/34/EU (formerly ATEX 95). By compelling constructors to carry out an Ignition Hazard Analysis, evaluating the risk level of hot surfaces, flames and hot gasses, mechanically generated sparks and static electricity, etc, end-users can rest assured that the equipment they install is not a potential ignition source.
In legislative terms, there is again a distinction made in terms of dust zoning and gas zoning, as well as underground (Group I) and above-ground (Group II) equipment. As a leading manufacturer of Group II equipment, Donaldson can self-declare equipment providing the lowest (Normal) level of protection for gas and dust (3G or 3D), as well as for non-electrical aspects of the High (2G or 2D) level equipment.
UKManufacturing Summer 2024
A notified body is responsible for approval of its electrical systems, however, and for all aspects of the top level of protection. This Very High (1G or 1D) category ensures that no ignition source is present during normal operation, as well as in the event of malfunctions.
And it is at this point where the two ATEX directives intertwine, with the specific level of protection required for operation in a previously specified zone now becoming apparent. So, for example, Zone 22, the lowest dust danger zone, will require 3D-level equipment, while 1D protection will be needed in Zone 20 (see Table 1).
Manufacturers, of course, are also obliged to supply equipment with the correct markings and provide clear information on any residual risks, safe use and any limits. Conforming equipment will clearly display ATEX
identification in the form of the hexagon, followed by numbers stating the equipment group (e.g. II for above ground) and the safety category (e.g. 1 for Zone 20/0), plus the letter D or G to signify the type of explosive atmosphere. The next two sets of markings verify the dust group (combustible, conductive or non-conductive) and temperature class. As a leading supplier of above-ground explosion-mitigation equipment, Donaldson is ideally placed to offer expert advice on choosing the most appropriate solutions that will protect employees in areas with explosive atmospheres. A wide range of resources that will help employers develop the most-effective mitigation strategy can also be found on the Donaldson website.
Donaldson
www.Donaldson.com
45
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68
