Abstract
When preparing a permitted explosive recipe an energy or an explosive heat is considered, which should ensure the detonability of the system and at the same time a power that satisfies the purpose for which it will be used, under the conditions of firedamp hazardous mines. The safety parameters for the explosive charges used in the firedamp hazardous mines are decisive, in order to ensure the safety and health requirements at work together with the efficient performance of the blasting operation. The permitted explosive type emulsion is recommended to be used in underground mines, open pit mines as a special methane explosive and can be used where a coal dust and/or methane explosion hazard exists can be loaded into dry and wet blasting holes and it can be used for mechanical loading. The permitted explosive type emulsion is a Detonator-sensitive explosives that can be reliably initiated in an unconfined state by a No. 8 strength detonator it have safety handling characteristics because of the relatively low sensitivity to friction, shock and impact. Technological changes due to the change of suppliers of certified explosives for civil use for underground use in the firedamp hazardous mines, involve reassessing the safety and efficiency of the loads made with these products, which have not been tested and evaluated for the conditions from the Jiu Valley mines.
Highlights
Testing of firedamp-proof explosives for civil use for their safe use in potentially explosive atmospheres by checking the safety of methane and coal dust in order to ensure continued satisfaction of the requirements of Directive 2014/28 / EU Annex II, GD no. 197/2016 Annex 2, as well as from the Normative Document of the product
The firedamp-proof explosive is used for underground works and is safety against methane and coal dust
The amount of powder is measured with a measure of 50 g of powder (Figure 3). - The cartridges are inserted in the mortar hole placed end to end; - To make the coal dust in suspension, 1 kg of cold dust / bag is inserted in three paper bags. - To spread the dust, a quantity of approx. 12.5 g of firedamp-proof safety explosive is inserted into each bag, which is primed with an instant electric detonator
Summary
Testing of firedamp-proof explosives for civil use for their safe use in potentially explosive atmospheres by checking the safety of methane and coal dust in order to ensure continued satisfaction of the requirements of Directive 2014/28 / EU Annex II, GD no. 197/2016 Annex 2, as well as from the Normative Document of the product. The preparation of the samples is done on the table in the manipulation room of the observation post as follows: - Testing of firedamp-proof safety explosives is done in the form of cartridges as delivered by the manufacturer (Figure 2); - The size of the explosive charge in a test is that established by the product standard; - The explosive cartridges is place on the spoon (device made especially for this purpose); - The cartridges are placed on the spoon to be inserted in the mortar hole placed towards; - The last cartridge is initiated with an instantaneous electric detonator (or stage 0) the rheophores are hold as supplied by the manufacturer (short-circuited or fully insulated). The amount of powder is measured with a measure of 50 g of powder (Figure 3). - The cartridges are inserted in the mortar hole placed end to end; - To make the coal dust in suspension, 1 kg of cold dust / bag is inserted in three paper bags. - To spread the dust, a quantity of approx. 12.5 g of firedamp-proof safety explosive is inserted into each bag, which is primed with an instant electric detonator (or step 0)
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