Failure (blasting technology)

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In blasting technology , a failure is understood to be a non-exploded impact cartridge or a non-exploded detonator . A distinction must be made between the dud , an unexploded explosive device.

Distinctions

Failures can be differentiated according to various criteria:

  • Complete failure / partial failure: failure of all or part of the explosive charge
  • Internal / external failure: the failure is inside or outside the hold (e.g. borehole)
  • Ignition / explosion failure: failure is due to incomplete triggering of the detonator or the explosive (ignition failures are more common here, most of them failing with power shortages)

Again, failure can have several causes:

  • Manufacturing defects (this is attempted to be avoided by a final quality control during production)
  • Inadequate ignition current (lack of current), due to shunt or short circuit of the ignition wires to earth, use of the wrong ignition machine, incorrect switching of the electrical igniter, use of U and HU igniters in the same ignition circuit
  • Explosives could not be ignited (failure of the explosion), for example because of aging, moisture or foreign substances (e.g. drilling dust) in the explosives, choosing the wrong charge diameter , choosing the wrong booster charge
  • Chopping off the detonating cords or safety fuses or charging station due to previous detonations

The reasons for failure in italics are mostly due to a lack of manual workmanship of the blasting system by the person authorized to blast. Wherever a safe detonation is necessary, for example building blasts in cities, it is therefore necessary to work with the necessary safety and to check the construction of the ignition system again and again.

Failure elimination

Under failure remedy is clearing away the non or only partly exploded explosive charge , the so-called loser , respectively. After blasting, it must be disposed of under strict safety precautions.

Individual evidence

  1. ↑ Technical rule on explosives law "Blasting work" (SprengTR310). Federal Ministry of Labor and Social Affairs, October 5, 2016, accessed on April 9, 2019 .

literature

  • Horst Roschlau: Sprengen - theory and practice . Verlag für Grundstofftindustrie, Leipzig 1993, ISBN 3-342-00492-4 .

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