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Text version of the page
| 23 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Table 13: Types of Protection for Non-electrical Apparatus in Explosive Gas Atmosphere and used in the Presence of Combustible Dust | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Constructional safety "c" EN 13463-5 | Proven technical principles are applied to equipment types which do not have any ignition source under normal operating conditions, so that the risk of mechanical failure which cause ignitable temperatures and sparks is reduced to a minimum degree. | Couplings, pumps, gearing, chain drives, belt conveyors | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Flameproof enclosure "d" EN 13463-3 | Parts which can ignite a potentially explosive atmosphere are surrounded by an enclosure which withstands the pressure of an explosive mixture exploding inside the enclosure, and prevents the transmission of the explosion to the atmosphere surrounding the enclosure. | Brakes, couplings | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| LU | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Pressurized enclosure "p" l^^!5 The formation of a potentially explosive atmosphere in- Pumps EN 13463-7 side a casing is prevented by maintaining a positive internal pressure of protective gas in relation to the surrounding atmosphere and, where necessary, by supplying the inside of the casing with a constant flow of protective gas acting to dilute any combustible mixtures. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Ignition source monitoring "b" EN 13463-6 | Sensors are integrated in the equipment to detect hazardous conditions to come, and to take steps against them before potential ignition sources become effective. The measures can be initiated automatically by means of a direct connection between the sensors and the ignition protection system or manually by issuing a warning message intended for the operator of the equipment. | Pumps, belt conveyors | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Liquid immersion "k" EN 13463-8 | Ignition sources are rendered inactive by immersion Submerged pumps, gears, in a protective liquid or by constant moistening using a liquid immersion liquid film. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Restricted breathing "fr" EN 13463-2 | The effective sealing of the enclosure can reduce penetration of explosive atmosphere to an extent that no potentially explosive atmosphere can form in it. Pressure differences between the interior and the exterior atmosphere have to be taken into account. Application is limited to equipment category 3. | Equipment exclusively for Zone 2 or Zone 22 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| R.STAHL explosion protection | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||