A New Method for Verification of Ignition Systems Integrated in Special Trucks

Ghicioi, Emilian; Paraian, Mihaela; Lupu, Leonard; Jurca, Adrian

doi:10.30638/eemj.2012.159

Cited by 1 publication

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“…Should no harmonised standards exist, the required tests and extent of testing are determined by a body notified within the scope of the directive, and some of the basic certification tests include maximum temperature determination and potential methane and coal dust ignition source identification (Kałuża, 2017;Jurca et al, 2020). The ATEX directive encompasses requirements for both electrical and nonelectrical (Rogers, 2003;Gakhar et al, 2006;Thurnherr et al, 2007;Ghicioi et al, 2010a and2010b;Jurca et al, 2020) devices. Unlike electrical device standardisation, the standardisation of non-electrical devices is a relatively recent endeavour, and its greatest development began with the adoption of the ATEX directive in 1994 (Górny, 2017).…”

Section: Introductionmentioning

confidence: 99%

Safety of Steel Arch Support Operation During Rock Bursts Under Explosive Atmosphere Conditions

Pytlik

Frąc

2023

Studia Geotechnica Et Mechanica

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Methane and coal dust explosions are among the most common causes of disasters in hard coal mining. Therefore, it is important for occupational safety in hard coal mines operating under methane and coal dust explosion hazards to identify possible ignition sources, whether due to natural or technical factors. One technical source of ignition can be mechanical sparks generated during operation of mechanical equipment and high surface temperatures of equipment components during operation. This paper presents the methodology and results of thermal imaging and strength testing of roadway support elements under dynamic loading. The goal of the tests was to identify the potential explosive atmosphere ignition sources during the operation of the support under the conditions of rock bursts. The scope of testing encompassed the temperature measurements by means of thermal camera of friction prop and yielding support frame sliding joint elements at yield under dynamic impact loading (simulating a burst). Significant joint element heating and mechanical sparking was observed during the testing of arching yielding support frame sliding joints and straight friction prop joints as a result of friction at yield. Some of the aspects defined in standard PN-EN ISO80079-36:2016 include the maximum temperature T max =150°C for a surface that can accumulate a layer of coal dust. Tests of the friction joints have shown that during impact loading, numerous mechanical sparks are produced at the friction joints of sections of the steel prop, with the surface temperature of the sections starting from 169.6°C and reaching up to 234.1°C. During tests it was also to determined emissivites of the tested sliding joints constructed from V29-V32 secrions depending on corrosion products which consist in range 0.842–0.873. Such a high temperature can initiate an explosive mixture consisting of methane, air and coal dust.

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